Home
SGMA Data Viewer
As part of DWR’s technical assistance to Groundwater Sustainability Agencies (GSAs), other water managers, and the public, DWR has developed the SGMA Data Viewer. The SGMA Data Viewer provides access to groundwater-related datasets that are organized by the requirements of SGMA and the Groundwater Sustainability Plan (GSP) regulations for the purposes of supporting GSP development and implementation.
Benefits to GSAs and other Water Managers
Currently, regional and statewide groundwater information is publicly available, however this information is collected and disseminated through a variety of portals and applications. The SGMA Data Viewer provides centralized data access that will improve coordination across the State and help GSAs meet the requirements of SGMA and the GSP regulations. For additional information on DWR’s technical assistance program visit: https://www.water.ca.gov/Programs/Groundwater-Management/Data-and-Tools
Data Disclaimer
The Department of Water Resources makes no warranties, representations or guarantees, either expressed or implied, as to the accuracy, completeness, correctness, or timeliness of the information in the groundwater-related datasets that are accessible through the SGMA Data Viewer, nor accepts or assumes any liability arising from use of the SGMA Data Viewer or underlying data. Neither the Department nor any of the sources of the information utilized by the SGMA Data Viewer shall be responsible for any errors or omissions, or for the use or results obtained from the use of this information. Classifications and boundaries shown in this viewer are graphical representations only, and do not establish legal rights or define legal boundaries. A Groundwater Sustainability Agency is not required to use the SGMA Data Viewer and underlying data, and their use does not guarantee the adequacy of a Groundwater Sustainability Plan that relies on such data.
Data Documentation
Current Conditions
DWR GW Level Percentile Statistics
This layer is presented both in the “Current Conditions” and “Groundwater Levels” sections of the SGMA Data Viewer. For a description of this layer, please see the “Groundwater Levels” section.
Locally Reported Dry Wells
Description
The California Department of Water Resources – Dry Well Reporting System is for Californians experiencing problems with their private (self-managed) wells (not for residents served by a public water system already regulated by the State). DWR provides summaries of the data, useful for statewide and local purposes. A cross-agency team, led by DWR, seeks to verify and update the data submitted. However, due to the volunteer nature of the reporting and limitations on reporting agencies, information in the following summaries are undoubtedly under-representative of all dry wells that have occurred. In addition, reports are received from multiple sources and there are occasionally errors and omissions that can create duplicate entries. For example, missing information or no data for a given county does not necessarily mean that there are no dry wells in the county, rather only that none have been reported to the State. The summaries reflect outreach conducted by local and state entities. Dry wells can be caused by many drought and non-drought factors, including aging infrastructure like corroded wells, declining groundwater levels, changes to weather patterns and climate, or surface water and groundwater management. These factors affect specific areas in unique ways and vary throughout the State.
Service/Hosted Location
https://mydrywell.water.ca.gov/report
Contact
Sustainable Groundwater Management Program
SGMPS@water.ca.gov
Dry Domestic Well Susceptibility
Description
DWR, in coordination with the State Water Resources Control Board, has developed an interactive dashboard, called the Dry Domestic Well Susceptibility within Groundwater Basins Dashboard (Dry Well Susceptibility Dashboard), to identify areas within groundwater basins throughout the State that may be prone to water supply shortages due to domestic drinking water wells going dry. The dashboard identifies the density of "susceptible” domestic wells per square mile based on recent groundwater level measurements and models future depth to water. If the modeled future depth to water falls below the dry well depth of a domestic well, the well is labeled susceptible. The Dry Well Susceptibility Dashboard is housed on the California’s Groundwater Live web-based platform which contains the latest information and data on groundwater conditions across the State. The State, local agencies, and well owners can use this dashboard to anticipate where wells may be susceptible, to inform drought preparedness decision-making and resource allocation.
Service/Hosted Location
Calfironia’s Groundwater Live: https://sgma.water.ca.gov/CalGWLive/
GIS Service: https://services.arcgis.com/aa38u6OgfNoCkTJ6/ArcGIS/rest/services/DryWellSusceptibility_CalGWLive_gdb/FeatureServer
Technical Notes: https://data.cnra.ca.gov/dataset/calgw-live/resource/e0bf3d2b-ceca-41ca-876f-d3e378503583
Python Notebook: https://data.cnra.ca.gov/dataset/calgw-live/resource/c1c30d5f-c4bf-43fa-94d3-e7c9d5037df9
Contact
Sustainable Groundwater Management Program
SGMPS@water.ca.gov
Subsidence CGPS Stations and InSAR Data
These layers are presented both in the “Current Conditions” and “Land Subsidence” sections of the SGMA Data Viewer. For a description of these layers, please see the “Land Subsidence” section.
Groundwater Levels
The observation and collection of groundwater level data is a fundamental aspect of sustainable groundwater management. Consistent groundwater level measurements allow short and long-term trends to be tracked within groundwater basins and promotes effective management of groundwater resources across the state. The following groundwater level resources, including DWR’s Monitoring Network and Monitoring Protocols Best Management Practices have been compiled to support the development of GSPs.
DWR Periodic Groundwater Measurements
Description
This dataset contains periodic and long-term groundwater level measurements collected by the Department of Water Resources and cooperating agencies in groundwater basins statewide. It also includes data collected through the CASGEM (California Statewide Groundwater Elevation Monitoring) Program. Most measurements are taken manually twice per year to capture the peak high and low values in groundwater elevations. However, the dataset also includes measurements recorded more frequently, such as monthly, weekly, or daily. For groundwater level measurements recorded at more frequent intervals, for example, hourly, please refer to the “Continuous Groundwater Measurement” section below.
Service/Hosted Location
The source data can be accessed directly from three websites.
● The California Natural Resources Agency Open Data Platform (https://data.cnra.ca.gov/) provides access to this and other datasets. For a direct link to the periodic groundwater level measurements, visit: https://data.cnra.ca.gov/dataset/periodic-groundwater-level-measurements
● The Water Data Library (https://wdl.water.ca.gov/waterdatalibrary/) provides anonymous access to this and other datasets.
● The CASGEM online system (https://www.casgem.water.ca.gov/OSS) provides authenticated access to only the periodic groundwater measurements.
Guidance
This dataset is maintained in the DWR Enterprise Water Management database and contains information specific to the location of groundwater level monitoring wells and groundwater level measurements collected at these wells. Well site information typically includes well location coordinates and elevation, and other supplementary items about the well type and construction. Groundwater level measurement records typically include information about the time/date a measurement was collected, the entity collecting the measurement, a measurement indicating the depth to groundwater, and quality information about the measurement.
Contact
Sustainable Groundwater Management Program
SGMPS@water.ca.gov
DWR Continuous Groundwater Measurements
Description
This dataset contains continuous time-series data from automated recorders at sites operated by the Department of Water Resources. Readings are taken at 15-minute to one-hour intervals. Some of the readings are relayed to the California Data Exchange Center through telephone lines or by satellite transmissions. However, most of the monitoring sites are visited once every month or two, when readings are off-loaded from data recorders, then finalized and published.
Service/Hosted Location
Download and API at Open Data: https://data.cnra.ca.gov/dataset/continuous-groundwater-level-measurements
Or available at the Water Data Library (https://wdl.water.ca.gov/waterdatalibrary/).
Guidance
Water-level monitoring involves "continuous" or periodic measurements. Continuous monitoring makes use of automatic water-level sensing and recording instruments that are programmed to make scheduled measurements in wells. This provides a high-resolution record of water-level fluctuations. Resulting hydrographs can accurately identify the effects of various stresses on the aquifer system and provide measurements of maximum and minimum water levels in aquifers. Continuous monitoring may be the best technique to use for monitoring fluctuations in groundwater levels during droughts and other critical periods when hydraulic stresses may change at relatively rapid rates, or when real-time data are needed for making water management decisions.
Contact
Sustainable Groundwater Management Program
SGMPS@water.ca.gov
USGS Periodic Groundwater Measurements
Description
Data on this layer are taken from the USGS National Water Information System (NWIS), which contains extensive water data. Nationwide, the groundwater database consists of more than 850,000 records of wells, springs, test holes, tunnels, drains, and excavations in the United States. Available site descriptive information includes well location information such as latitude and longitude, well depth, and aquifer.
Service/Hosted Location
The source data can be accessed directly from USGS Groundwater Levels
Stations can be downloaded from https://waterdata.usgs.gov/nwis/si.
Guidance
The USGS annually monitors groundwater levels in thousands of wells in the United States. Groundwater level data are collected and stored as either discrete field-water-level measurements or as continuous time-series data from automated recorders. Data from some of the continuous record stations are relayed to USGS offices nationwide through telephone lines or by satellite transmissions providing access to current groundwater data.
Once a complete day of readings are received from a site, daily summary data are generated and made available online. The USGS finalizes data at individual sites on a continuous basis as environmental conditions and hydrologic characteristics permit.
Contact
NWIS Water Data Support Team Contact Form
1-888-ASK-USGS (1-888-275-8747)
Groundwater Sustainability Plan Monitoring Sites
Description
The Groundwater Sustainability Plan (GSP) Monitoring dataset contains the monitoring sites and associated groundwater level, subsidence, or streamflow measurements collected by Groundwater Sustainability Agencies (GSA) during implementation of their GSP. All data is submitted to the Department of Water Resources (DWR) through the Sustainable Groundwater Management Act (SGMA) Portal’s Monitoring Network Module (MNM).
The GSP Regulations established the monitoring network criteria (23 CCR § 354.34) and the data and reporting standard for monitoring sites and measurements (23 CCR § 352.4). The data fields associated with these datasets were created by DWR to ensure that GSAs electronically submit monitoring site and measurement data which meets the GSP Regulation’s data and reporting standards. For additional information regarding GSAs, GSPs, and SGMA related monitoring, please view DWR’s SGMA Portal Resources at https://sgma.water.ca.gov/portal/
Service/Hosted Location
https://services.arcgis.com/aa38u6OgfNoCkTJ6/arcgis/rest/services/GSP_Monitoring_Data/FeatureServer
Open Data: https://data.cnra.ca.gov/dataset/gspmd
Contact
Ben Gooding
Sustainable Groundwater Management Office
Benjamin.Gooding@water.ca.gov
DWR Groundwater Level Percentile Statistics
Description
The DWR Groundwater Level Percentile Statistics are based on the USGS Groundwater Watch concept of comparing the most recent groundwater level measurement to historical measurements for the same month. For a well to be ranked, the most recent measurement must have occurred within the last 18 months, and measurements from at least 10 years must exist for that month.
These statistics are applied to the dataset of periodic and long-term groundwater level measurements collected by the Department of Water Resources and cooperating agencies in groundwater basins statewide. It also includes data collected through the CASGEM (California Statewide Groundwater Elevation Monitoring) and SGMA Programs. Most measurements are taken manually twice per year to capture the peak high and low values in groundwater elevations. However, the dataset also includes measurements recorded more frequently, such as monthly, weekly, or daily.
Service/Hosted Location
GIS service: https://services.arcgis.com/aa38u6OgfNoCkTJ6/arcgis/rest/services/GroundwaterLevelPercentileClass_gdb/FeatureServer/0
Contact
Ben Brezing
Sustainable Groundwater Management Office
benjamin.brezing@water.ca.gov
Seasonal Groundwater Level Reports
Seasonal groundwater level reports provide information from selected water level measurements and are intended to portray a snapshot of groundwater levels for Spring or Fall in a given year, or the change in seasonal groundwater levels over specific time intervals. These reports characterize the data three ways: depth, elevation, and change.
Service/Hosted Location
https://gis.water.ca.gov/arcgis/rest/services/Geoscientific
Guidance
The source of groundwater level measurement data is the new DWR Enterprise Water Management database (EWM), which includes water level data previously stored in the DWR Water Data Library and CASGEM databases. For more information about this dataset, please refer to the section on “Periodic Groundwater Measurements”, above.
The terms Spring and Fall for these reports are intended to provide a general description of the measurement period in which the data were collected. Groundwater level measurements are selected based on measurement date and well construction information (where available) and are intended to approximate the groundwater levels in the unconfined to uppermost semi-confined aquifers. Groundwater level change information depicts the difference in groundwater levels in a specific well.
Depth
These layers show the depth to groundwater below the ground surface. Depth information is represented in feet below the ground surface. Increasing values indicate increasing depth to groundwater (or deeper/lower water levels). Negative values indicate that the groundwater level is above ground surface.
Points show the depth to groundwater values collected from wells. The contours and color ramp layers provide a smoothed approximation of the depth to groundwater level “surface” based on the measurement data. The measurement values may not exactly match the contour or color ramp values because of the surface and contour smoothing process.
Elevation
These layers show groundwater elevation. Groundwater elevations are shown as feet above or below mean sea level (positive values indicate groundwater elevations above mean sea level, negative values indicate groundwater elevations below mean sea level).
Points show the elevation of the groundwater level in wells. The contours and color ramp layers provide a smoothed approximation of the groundwater elevation “surface” based on the measurement data. The measurement values may not exactly match the contour or color ramp values because of the surface and contour smoothing process.
Water level measurements are selected based on measurement date, well construction information (when available), and approximate groundwater elevations in the unconfined to uppermost semi-confined aquifers.
Change
These layers show changes in groundwater levels over time. Each point shows the calculated difference between the measured groundwater levels from the selected time periods. The change in groundwater level is plotted on the map only if a measurement exists in both time periods at a well.
The colored points in the measurements layer show the location of all wells where the groundwater level change is determined. The contours and color ramp layers approximate change in the groundwater levels for the unconfined to uppermost semi-confined aquifers and is based on a subset of all of the measurement points, which were selected based on measurement date and well construction information (where available).
Contact
Bill Brewster
North Central Region Office
Division of Integrated Regional Water Management
Bill.Brewster@water.ca.gov
Well Completion Reports
Description
In 1949, the California Legislature concluded that collecting information on newly constructed, modified or destroyed wells would be valuable in the event of underground pollution, and would provide geologic information on the State's groundwater basins. The California Water Code (Section 13700) recognizes that improperly constructed and abandoned water wells can be a source of groundwater contamination and a threat to public health, and requires water well drillers to file a Well Completion Report (WCR) form with the California Department of Water Resources (Section 13751). WCRs contain information collected by drillers during the drilling and construction of water wells, including the location, dates of construction, planned use, depth of the well, subsurface geologic units encountered, well construction, and well yield. California Water Code Section 13752 allows for the release of copies of well completion reports to governmental agencies and to the public. DWR is now making well completion reports information available online.
Service/Hosted Location
Download and API at Open Data: https://data.cnra.ca.gov/dataset/well-completion-reports
Guidance
This feature service represents an index of records from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR). This feature service is for informational purposes only. All attribute values should be verified by reviewing the original Well Completion Report. Known issues include: - Missing and duplicate records - Missing values (either missing on original Well Completion Report, or not key entered into database) - Incorrect values (e.g. incorrect Latitude, Longitude, Record Type, Planned Use, Total Completed Depth) - Limited spatial resolution: The majority of well completion reports have been spatially registered to the center of the 1x1 mile Public Land Survey System section that the well is located in.
Contact
Juliana Spector
Sustainable Groundwater Management Office
Juliana.Spector@water.ca.gov
Well Completion Report Statistics
Description
In 1949, the California Legislature concluded that collecting information on newly constructed, modified or destroyed wells would be valuable in the event of underground pollution, and would provide geologic information on the State's groundwater basins. The California Water Code (Section 13700) recognizes that improperly constructed and abandoned water wells can be a source of groundwater contamination and a threat to public health, and requires water well drillers to file a Well Completion Report (WCR) form with the California Department of Water Resources (Section 13751). WCRs contain information collected by drillers during the drilling and construction of water wells, including the location, dates of construction, planned use, depth of the well, subsurface geologic units encountered, well construction, and well yield. California Water Code Section 13752 allows for the release of copies of well completion reports to governmental agencies and to the public. DWR is now making well completion reports information available online.
Service/Hosted Location
GIS Service: https://gis.water.ca.gov/arcgis/rest/services/Environment/i07_WellCompletionReports/MapServer/1
Guidance
This feature service represents well statistics for different well use categories. This polygon feature service is based on the Public Land Survey System (PLSS) sections, and summarizes the well count, as well as average, minimum, and maximum well depths for domestic, public, and production wells. Well statistics are based on records from the California Department of Water Resources' (DWR) Online System for Well Completion Reports (OSWCR). Statistics are provided for private supply wells, public supply wells, and production wells. Production wells include those wells that are designated as irrigation, municipal, public, or industrial on Well Completion Reports. Limitations of the underlying Well Completion Reports data include missing and incorrect values. Statistics are based on Well Completion Report records with WCR Types 'New' and 'Modification or Repair' and may double count wells in some cases. This feature class is for qualitative informational purposes only.
Contact
Juliana Spector
Sustainable Groundwater Management Office
Juliana.Spector@water.ca.gov
Groundwater Storage
C2Vsim: California Central Valley Groundwater-Surface Water Simulation Model
C2Vsim is an integrated numerical model that simulates water movement through the linked land surface, groundwater and surface water flow systems in California’s Central Valley using the Integrated Water Flow Model (IWFM) platform.
Service/Hosted Location
For more information on C2Vsim, please visit:
https://water.ca.gov/Library/Modeling-and-Analysis/Central-Valley-models-and-tools/C2VSim
For more information on DWR’s Integrated Water Flow Model code, please visit:
https://water.ca.gov/Library/Modeling-and-Analysis/Modeling-Platforms/Integrated-Water-Flow-Model
For more information on other DWR modeling tools, please visit:
https://www.water.ca.gov/Library/Modeling-and-Analysis/Central-Valley-models-and-tools
Groundwater Sustainability Plan Annual Reports
Description
The Groundwater Sustainability Plan (GSP) Annual Report (AR) datasets contain the following data submitted by Groundwater Sustainability Agencies (GSA) and Alternative Agencies as part of their GSP AR or Alternative to GSP AR: groundwater extraction, surface water supply, total water use, and change in storage volumes for a given water year. All data was originally submitted to the Department of Water Resources (DWR) through the Sustainable Groundwater Management Act (SGMA) Portal’s AR Modules (https://sgma.water.ca.gov/portal/gspar/submitted and https://sgma.water.ca.gov/portal/alternative/annualreport/submitted). Data records within each dataset correspond to either an entire basin or one of multiple GSP areas which collectively correspond to an entire basin.
The GSP Regulations established the AR data requirements (23 CCR § 356.2) and tasked DWR with developing an online reporting system for GSAs and Alternative Agencies to electronically submit these data (23 CCR § 353.2). The data fields associated with these datasets were created by DWR to ensure GSAs and Alternative Agencies electronically submitted the required AR data to DWR’s online reporting system, the SGMA Portal (https://sgma.water.ca.gov/portal/). For additional information regarding the AR Modules and the AR submittal process, please view the DWR’s AR resources (https://sgma.water.ca.gov/portal/resources).
The SGMA Data Viewer allows the user to render Annual Report datasets based on dataset selection, Water Year, and attribute column (if available) by Basins, Points, or Both.
Service/Hosted Location
Open Data: https://data.cnra.ca.gov/dataset/gspar
Contact
Ben Gooding
Sustainable Groundwater Management Office
Benjamin.Gooding@water.ca.gov
Water Quality
DWR Water Quality Stations
Description
The California Department of Water Resources (DWR) discrete “grab” water quality dataset contains DWR-collected, current and historical, chemical and physical parameters found in drinking water, groundwater, and surface waters throughout the state.
Water Data Library:
https://wdl.water.ca.gov/waterdatalibrary/Map.aspx
Service/Hosted Location
GIS Map Service: https://gis.water.ca.gov/arcgis/rest/services/Geoscientific/i08_Stations_Discrete_Grab_Water_Quality/MapServer/0
Download at Open Data: https://data.cnra.ca.gov/dataset/water-quality-data
Contact
Water Data Library
wdlweb@water.ca.gov
Combined Water Quality Hazard and Exposure Risk
Description
The aquifer risk map is being developed to fulfill requirements of SB-200 and is intended to help prioritize areas where domestic wells and state small water systems may be accessing groundwater that does not meet primary drinking water standards (maximum contaminant level or MCL). In accordance with SB-200, the risk map is to be made available to the public and is to be updated annually starting January 1, 2021. The Fund Expenditure Plan states the risk map will be used by Water Boards staff to help prioritize areas for available SAFER funding.
This layer shows the combined hazard (water quality) and exposure (drinking water users) risk for all census block groups. The combined risk of each area is based on the water quality risk combined with the density of domestic wells and state small water systems. For each census block group, the combined risk is displayed as a percentile, with higher percentiles indicating higher combined risk. Additionally, the estimated count of domestic wells and state small water systems per census block group is displayed, along with the disadvantaged/severely disadvantaged status of each census block group based on median household income data from 2018.
Service/Hosted Location
https://gispublic.waterboards.ca.gov/portal/home/item.html?id=ba14c15c8005418f9e11910903f28cb5
Water Quality Portal (WQP)
Description
The Water Quality Data Portal (WQP) provides an easy way to access data stored in various large water quality databases through form-based queries as well as through standalone web services. The WQP is sponsored by the United States Geological Survey (USGS), the Environmental Protection Agency (EPA), and the National Water Quality Monitoring Council (NWQMC). The WQP serves data collected by over 400 state, federal, tribal, and local agencies.
Service/Hosted Location
https://www.waterqualitydata.us/
GeoTracker GAMA
Description
The Groundwater Ambient Monitoring and Assessment (GAMA) Program is California's comprehensive groundwater quality monitoring program that was created by the State Water Resources Control Board and expanded by the Groundwater Quality Monitoring Act of 2001, resulting in a publicly accepted plan to monitor and assess groundwater quality in basins that account for 95% of the state's groundwater use.
The GeoTracker GAMA groundwater information system is an integral part of this plan. GeoTracker GAMA integrates and displays water quality data from various sources on an interactive Google-based map. Analytical tools and reporting features help users assess groundwater quality and obtain groundwater related information in California. Please review the fact sheet for more information.
Service/Hosted Location
Map Application: https://gamagroundwater.waterboards.ca.gov/gama/gamamap/public/
Download and API at Open Data: https://data.ca.gov/dataset/ground-water-water-quality-results
Land Subsidence
DWR Extensometers
Description
Borehole extensometers are a more site-specific method of measuring land subsidence. These instruments consist of a pipe or cable anchored at the bottom of a well casing. Pipe or cable extend from the bottom of the well, through geologic layers susceptible to compaction, to the ground surface. The pipe or cable is connected to a recorder that measures the relative distance between the bottom of the bore hole to the ground surface. These instruments are capable of detecting changes in land surface elevation to 1/100th of a foot. When land subsidence and water depth monitoring activities are paired together, hydraulic and mechanical properties of the aquifer system can be determined. DWR monitors 11 extensometers in the Sacramento Valley.
Service/Hosted Location
Download and API at Open Data: https://data.cnra.ca.gov/dataset/wdl-ground-surface-displacement
Guidance
DWR makes no warranties or guarantees - either expressed or implied - as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data.DWR makes no warranties or guarantees - either expressed or implied - as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data.
Contact
Ben Brezing
Sustainable Groundwater Management Office
benjamin.brezing@water.ca.gov
USGS Extensometers
Description
An extensometer measures the compaction and expansion of the aquifer system to a specified depth. For the most updated compaction and groundwater-level data for USGS extensometers, please visit the USGS National Water Information System (NWIS).
Service/Hosted Location
The source data can be accessed directly from USGS Groundwater Levels
Stations can be downloaded from https://waterdata.usgs.gov/nwis/si.
Guidance
Extensometer data values are reported by the USGS National Water Information System (NWIS) in feet, and displayed on the SGMA data viewer in inches. Positive values indicate cumulative compaction since the date listed in the parameter name. Negative values indicate cumulative expansion since the date listed in the parameter name.
Contact
Michelle Sneed
micsneed@usgs.gov
GPS Stations
Description
Continuous Global Positioning System (CGPS) Stations record horizontal and vertical ground surface displacement over time. SOPAC/CSRC (http://sopac-csrc.ucsd.edu/) maintains a network of CGPS stations and provides public access to their data. A moving 31 day average filter has been applied to the vertical displacement data from both networks to remove higher frequency noise. This dataset defaults to showing the Station Period of Record (POR) with options to look at different years.
Service/Hosted Location
Contact
http://sopac-csrc.ucsd.edu/index.php/contact/
Estimated Subsidence in the San Joaquin Valley between 1949 - 2005
Description
Total vertical ground surface displacement (subsidence) in the San Joaquin Valley between 1949 and 2005 was estimated by comparing elevation contours from 1950s quadrangle maps to a digital elevation model (DEM) from a 2005 NextMap Synthetic-aperture radar (SAR) acquisition. For a full description of the process, see map service description.
Service/Hosted Location
Dataset at Open Data: https://data.cnra.ca.gov/dataset/vertical-displacement-sjv-1949-to-2005
Guidance
The Department of Water Resources makes no warranties, representations or guarantees, either expressed or implied, as to the accuracy, completeness, correctness, or timeliness of the information in this dataset, nor accepts or assumes any liability arising from use of these data. Neither the Department nor any of the sources of this information shall be responsible for any errors or omissions, or for the use or results obtained from the use of this information. A Groundwater Sustainability Agency is not required to use these data, and their use does not guarantee the adequacy of a Groundwater Sustainability Plan that relies on such data.
Contact
Ben Brezing
Sustainable Groundwater Management Office
benjamin.brezing@water.ca.gov
TRE ALTAMIRA InSAR Dataset
Description
This dataset represents measurements of vertical ground surface displacement in more than 200 of the high-use and populated groundwater basins across the State of California, starting in January of 2015. Vertical displacement estimates are derived from Interferometric Synthetic Aperture Radar (InSAR) data that are collected by the European Space Agency (ESA) Sentinel-1A satellite and processed by TRE ALTAMIRA Inc. (TRE), under contract with the California Department of Water Resources (DWR) as part of DWR's SGMA technical assistance to provide important SGMA-relevant data to GSAs for GSP development and implementation. Sentinel-1A InSAR data coverage began in late 2014 for parts of California, and coverage for the entire study area began on June 13, 2015. Included in this dataset are point data that represent average vertical displacement values for 100 meter by 100 meter areas, as well as GIS rasters that were interpolated from the point data; rasters for total vertical displacement relative to June 13, 2015, and rasters for annual vertical displacement rates with earlier coverage for some areas, both in monthly time steps.
Service/Hosted Location
Image Server: https://gis.water.ca.gov/arcgisimg/rest/services/SAR
Download at Open Data: https://data.cnra.ca.gov/dataset/tre-altamira-insar-subsidence
Guidance
This statewide InSAR subsidence dataset was acquired as part of DWR's SGMA technical assistance to provide important SGMA relevant data to GSAs for GSP development and implementation. The dataset is formatted to support the production of maps and graphs that show the extent, cumulative total, and annual rate of land subsidence.
Interferometric Synthetic Aperture Radar (InSAR) is a satellite-based remote sensing technique that measures vertical ground surface displacement changes at high degrees of measurement resolution and spatial detail. TRE processed Sentinel-1A InSAR data over the study area starting on January 1, 2015 and calibrated them to data from the regional network of Continuous Global Positioning System (CGPS) stations. TRE provided the resulting time series data of vertical displacement values for point locations on a grid with 100 meter spacing, with values representing averages of vertical displacement measurements within the immediate 100 by 100 meter square areas of each point. Gaps in the spatial coverage of the point data are areas with insufficient data quality. The period of record for the point time series data varies by area, starting as early as January 1, 2015 and as late as June 13, 2015. TRE also provided 2 sets of GIS rasters; annual vertical displacement and total vertical displacement relative to the common start date of June 13, 2015, both in monthly time steps. An Inverse Distance Weighted (IDW) method with a maximum search radius of 500 meter was used to interpolate the rasters from the point data.
Towill Inc. (Towill), also under contract with DWR as part of DWR's SGMA technical assistance, conducted an independent study comparing the InSAR-based vertical displacement point time series data to data from CGPS stations that were not used for calibrating the InSAR data, as well as CGPS stations that were used for calibrating InSAR data in Northern California. The goal of this study was to ground-truth the InSAR results to best available independent data.
The National Standard for Spatial Data Accuracy (NSSDA), developed by the Federal Geographic Data Committee (Document Number FGDC-STD-007.3-1998), offers a well-defined statistic and testing methodology for positional accuracy of geospatial data derived from various surveying methods including satellite remote sensing. The NSSDA is based on comparison of data from the tested dataset to values from an independent source of higher accuracy. For this study, variation in vertical displacement of California's ground surface over time, as measured from interferometric synthetic aperture radar (InSAR) satellites, was statistically compared to available ground based continuous global positioning systems (CGPS) data.
Tested: 20 mm vertical accuracy at 95% confidence level.
As tested by the processes described, this analysis provides statistical evidence that InSAR data accurately measured vertical displacement in California’s ground surface to within 20mm (value conservatively rounded up from 18.85mm) for the period January 1, 2015 through October 1, 2023. This statement of accuracy is based on the assumptions that the number, distribution, and characteristics of CGPS check point locations provide a representative sample of the entire study area and of the entire InSAR dataset, and that the CGPS data constitutes an independent source of higher accuracy. This statement of accuracy applies to the state-wide dataset and may vary for regional or localized area subsets.
The Department of Water Resources makes no warranties, representations or guarantees, either expressed or implied, as to the accuracy, completeness, correctness, or timeliness of the information in this dataset, nor accepts or assumes any liability arising from use of these data. Neither the Department nor any of the sources of this information shall be responsible for any errors or omissions, or for the use or results obtained from the use of this information. A Groundwater Sustainability Agency is not required to use these data, and their use does not guarantee the adequacy of a Groundwater Sustainability Plan that relies on such data.
Contact
Ben Brezing
Sustainable Groundwater Management Office
benjamin.brezing@water.ca.gov
Interconnected Surface Water Layers
CDEC Stations
Description
The California Data Exchange Center (CDEC) installs, maintains, and operates an extensive hydrologic data collection network including automatic snow reporting gages for the Cooperative Snow Surveys Program, precipitation, reservoir, and river flow and stage sensors for flood forecasting. This collection of CDEC layers is designed to assist local agencies with their responsibilities related to the Sustainable Groundwater Management Act and as an informational tool for all interested parties.
Contact
CDEC Help Desk Phone line: (916) 574-1777
CDEC Help Desk Email: flood.webmaster@water.ca.gov
Water Budget
SGMA requires local agencies to develop and implement GSPs that achieve sustainable groundwater management by implementing projects and management actions intended to ensure that the basin is operated within its sustainable yield by avoiding undesirable results. A key component in support of this effort is an accounting and assessment of the current, historical, and projected water budgets for the basin. The following resources have been compiled to support the development water budgets including DWR’s Water Budget BMP.
SGMA Water Year Type
Guidance
This dataset has been developed to assist the Groundwater Sustainability Agencies (GSAs) in their water budget development per the Groundwater Sustainability Plan Regulations §354.18. GSAs may choose to use this dataset but are not required. GSAs have the option to develop their own water year types based on best available data. For information on how the SGMA Water Year Type Dataset was developed, please see the SGMA Water Year Type Dataset Development Report.
Questions or comments can be directed to the Sustainable Groundwater Management Office at.
Service/Hosted Location
Download and API at Open Data: https://data.cnra.ca.gov/dataset/sgma-water-year-type-dataset
HUC8 GIS Map Service: https://utility.arcgis.com/usrsvcs/servers/57d8411e2480460b9372637651419f12/rest/services/InlandWaters/WBD_HUC8_CA/MapServer
Contact
Sustainable Groundwater Management Program
SGMPS@water.ca.gov
CDEC Water Year Type
Guidance
Chronological Reconstructed Sacramento and San Joaquin Valley Water Year Hydrologic Classification Indices
Based on measured unimpaired runoff (in million acre-feet), subject to revision.
For further description, see https://cdec.water.ca.gov/reportapp/javareports?name=WSIHIST
Service/Hosted Location
https://cdec.water.ca.gov/reportapp/javareports?name=WSIHIST
Contact
See https://cdec.water.ca.gov/reportapp/javareports?name=WSIHIST
Climate Change Datasets
Guidance
DWR is providing the necessary and relevant climate change datasets generated from climate modeling and hydrological modeling studies to assess projected groundwater conditions and water budgets considering specific groundwater management projects. These datasets should be used as input variables to the appropriate groundwater model to simulate the response to projected water conditions.
Contact
Craig Altare
Sustainable Groundwater Management Program
Craig.Altare@water.ca.gov
Gridded Precipitation and ET
Description
Precipitation and reference evapotranspiration change factor data are provided on a statewide basis under 2030 and 2070 projected conditions. Change factors are calculated from data developed as input to the Variable Infiltration Capacity (VIC) model for precipitation and output as provided by VIC for reference evapotranspiration. The dataset is provided as a grid covering the whole state at a 1/16o resolution.
Information regarding the VIC model can be found at: https://vic.readthedocs.io/en/latest/
User Selected Query
The user is able to make a custom query of the statewide dataset. Users can draw an extent or a polygon to select grids for download, or upload a shapefile that represents a boundary of interest (for example, a groundwater model grid domain) to clip out the desired grid cells.
Packaged by County
Precipitation and reference evapotranspiration data have been packaged by County which include data for all VIC grid cells that overlay the County boundary.
Packaged by Groundwater Basin
Precipitation and reference evapotranspiration data have been packaged by the latest (July 2017) DWR groundwater basin boundaries which include data for all VIC grid cells that overlay select basin or subbasin boundaries.
Streamflow Change Factors
Description
Combined runoff plus baseflow from the VIC model was aggregated using a weighted-average method over each HUC 8 watershed to produce streamflow change factors applicable to each watershed for 2030 and 2070 projected conditions.
Inflows and CalSim II Data (Central Valley Flows and Diversions)
Description
Point locations with streamflow and change factor data for major reservoir inflows and smaller tributary inflows within the Central Valley, as routed by the VIC model for 2030 and 2070 projected conditions. Many of these locations serve as inputs to the CalSim II model. Point locations have been approximately mapped spatially.
CalSim II model output data including major reservoir outflows, streamflows at select locations, and streamflow diversions have been compiled with approximate locations mapped spatially. Direct flows are provided for 2030 and 2070 projected conditions.
Land Use Datasets
Statewide and Regional Crop Mapping
Description
These datasets represent comprehensive, remotely sensed and field-scale assessment of agricultural land use information for California. The datasets were prepared by Land IQ, LLC under contract with the California Department of Water Resources (DWR) and provided to DWR and other resource agencies that require land use information across the state. Land use data is essential for resource planning and assessments across multiple agencies and serves as a consistent base layer for a broad array of potential uses. The data conforms to all DWR Enterprise GIS requirements, specifically the current DWR Spatial Data Standards, version 3.5 dated March 22, 2023.
To accomplish land use mapping at field scale, Land IQ integrated crop production knowledge with detailed ground reference information and multiple satellite and aerial imagery resources. Ground reference data collected during the growing season of each Water Year (WY) was used for model training and independent validation. Imagery resources used include the U.S. Department of Agriculture (USDA) National Agriculture Imagery Program (NAIP), U.S. Geological Survey (USGS) Landsat products, and Sentinel.
Individual fields (boundaries of homogeneous crop types representing true irrigated area, rather than legal parcel boundaries) were classified using a crop category legend and a more specific crop type legend. A supervised classification process using a random forest approach was used to classify delineated fields and was carried out county by county where training samples were available.
To determine frequency and seasonality of multiple-cropped fields, peak growth dates were determined for annual crops. Fields were attributed with DWR crop categories and included citrus/subtropical, deciduous fruits and nuts, field crops, grain and hay, idle, pasture, rice, truck crops, urban, vineyards, and young perennials. These categories represent aggregated groups of specific crop types in the Land IQ dataset.
Accuracy was calculated for the crop mapping using both DWR and Land IQ crop legends. The Land IQ classification legend for remotely sensed statewide crop mapping in 2014 was developed from known crop rotations, existing DWR model legends, and Land IQ mapping classes. The DWR legend was recently updated to incorporate Land IQ’s remote sensing legend, producing the current DWR modified standard land use legend version of December 2022. The two different legends were retained to preserve the detail in Land IQ’s base mapping while providing a rolled-up legend consistent with classification categories used in DWR’s standard land use legend.
The available land use dataset includes:
- Statewide land use surveys for Water Year (WY) 2014, 2016, and 2018 through 2022
- Regional land use surveys covering the Delta for 2015 and 2017
- Some County land use survey datasets from multiple years.
Note: The 2022 land use survey data are PROVISIONAL and will be replaced with final WY 2022 data when ready. Only summer crops were classified for statewide WY 2014 and WY 2016, but the WY 2018, 2019, 2020, 2021, and 2022 statewide datasets include multi-cropping.
PROVISIONAL STATEWIDE 2022 DATA USE DISCLAIMER
Statewide land use data for WY 2022 is PROVISIONAL. It is made available to provide immediate access for the convenience of interested persons. Importantly, land use classifications and field boundaries are not definitive and do not establish legal rights or define legal boundaries. While the Department believes the data to be reliable, the data is provisional and human or mechanical error remains a possibility. Therefore, the Department does not guarantee the accuracy, completeness, or timeliness of the information. Neither DWR nor any of the sources of the information shall be responsible for any errors or omissions, or for the use or results obtained from the use of this information.
Service/Hosted Location
Statewide land use survey data is available for download as shapefile or geodatabase GIS formats at https://data.cnra.ca.gov/dataset/statewide-crop-mapping
Regional land use survey data covering the Delta for 2015 and 2017 is available for download as shapefile or geodatabase GIS formats at https://data.cnra.ca.gov/dataset/region-land-use-surveys
County land use survey data from multiple years is available for download for some counties as shapefile or geodatabase GIS formats at https://data.cnra.ca.gov/dataset/county-land-use-surveys
Contact
DWR Land Use Program
LandUse@water.ca.gov
DWR Land Use Program Manager
Stanley Mubako
Stanley.Mubako@water.ca.gov
Manager, Land and Water Use Section
Bekele Temesgen
Bekele.Temesgen@water.ca.gov
CIMIS
Description
The California Irrigation Management Information System (CIMIS) currently manages over 145 active weather stations throughout the state. Spatial CIMIS produces statewide spatially distributed ETo values (ETo maps) from CIMIS station data at a 2 km spatial resolution, calculated using the American Society of Civil Engineers version of the Penman-Monteith equation (ASCE-PM). Required input parameters for the ASCE-PM ETo equation are solar radiation, air temperature, relative humidity, and wind speed at two meters height. These parameters are estimated for each 2 km pixel using various methods.
Daily solar radiation is generated from the visible band of the National Oceanic and Atmospheric Administration's (NOAA) Geostationary Operational Environmental Satellite (GOES) using the Heliosat-II model. This model is designed to convert images acquired by the Meteosat satellite into maps of global (direct plus diffused) irradiation received at ground level. The model has also been used with other geostationary satellites such as the GOES.
Air temperature, relative humidity, and wind speed values at each pixel were obtained by interpolating point measurements from CIMIS stations. Originally two interpolation methods, Spline and DayMet, were selected based on accuracy of results, code availability, and computational efficiency. Spline – the method currently used – is an interpolation method that fits a surface through or near known points using a function with continuous derivatives. Two- or three-dimensional Spline is used based on which weather parameter is to be interpolated
For detailed descriptions of the methodology used to map daily ETo, refer to "Daily reference evapotranspiration for California using satellite imagery and weather station measurement interpolation" (October 2007 – Civil Engineering and Environmental Systems).
Service/Hosted Location
Spatial CIMIS Raster website: https://cimis.water.ca.gov/SpatialData.aspx
CIMIS API: http://et.water.ca.gov/
Hydrogeologic Conceptual Model
A hydrogeologic conceptual model is an important component of a GSP and promotes sustainable groundwater management. A properly developed hydrogeologic conceptual model 1) provides an understanding of the general physical characteristics related to regional hydrology, land use, geology and geologic structure, water quality, principal aquifers, and principal aquitards of the basin setting; 2) provides the context to develop water budgets, mathematical (analytical or numerical) models, and monitoring networks; and 3) can be used as a tool for stakeholder outreach and communication. The following resources have been compiled to support the development of hydrogeologic conceptual models including DWR’s Hydrogeologic Conceptual Model BMP.
Soil & Recharge Maps
UC Davis SAGBI
The Soil Agricultural Groundwater Banking Index (SAGBI) is a suitability index for groundwater recharge on agricultural land. The SAGBI is based on five major factors that are critical to successful agricultural groundwater banking: deep percolation, root zone residence time, topography, chemical limitations, and soil surface condition. The Unmodified overlay shows SAGBI suitability groups when not accounting for modifications by deep tillage. The Modified overlay is theoretical; it shows SAGBI suitability groups when assuming that all soils with restrictive layers have been modified by deep tillage.
This layer was developed and is maintained by the California Soil Resource Lab at UC Davis and UC-ANR.
Soil Survey Geographic Database
Soil map units are the basic geographic unit of the Soil Survey Geographic Database (SSURGO). The SSURGO dataset is a compilation of soils information collected over the last century by the Natural Resources Conservation Service (NRCS). Map units delineate the extent of different soils. Data for each map unit contains descriptions of the soil’s components, productivity, unique properties, and suitability interpretations.
Each soil type has a unique combination of physical, chemical, nutrient and moisture properties. Soil type has ramifications for engineering and construction activities, natural hazards such as landslides, agricultural productivity, the distribution of native plant and animal life and hydrologic and other physical processes. Soil types in the context of climate and terrain can be used as a general indicator of engineering constraints, agriculture suitability, biological productivity and the natural distribution of plants and animals.
Service/Hosted Location
https://services.arcgis.com/P3ePLMYs2RVChkJx/ArcGIS/rest/services/DownloaderBasinsv2/FeatureServer/0
ESRI Hosted Soils Map Units Website - https://www.arcgis.com/home/item.html?id=06e5fd61bdb6453fb16534c676e1c9b9
Geologic Maps
CGS Geologic Map - 750k Generalized
This edition of the Geologic Map of California was prepared in recognition of the California Geological Survey's 150th Anniversary. It is an all-digital product built on the original compilation of C.W. Jennings published in 1977, with some additions and modifications. The Geologic Map of California presents an overview of the geology and structure of the state. It represents the geologic features that one would find on a visit to any locality in the state. The restraints of scale limit the detail that can be shown, but the most important geologic features are portrayed. The distribution of the major rock types and the major structural elements are shown with sufficient detail to be useful for many purposes.
Service/Hosted Location
Metadata: https://maps.conservation.ca.gov/cgs/metadata/GDM_002_GMC_750k_v2_metadata.html
Webmap: https://maps.conservation.ca.gov/cgs/gmc/
Service: https://gis.conservation.ca.gov/server/rest/services/CGS/Geologic_Map_of_California/MapServer
Geologic Map - Quaternary
The Department of Conservation, California Geological Survey (DOC/CGS), with funding from the Department of Water Resources (DWR), has completed an update of a Geographic Information System (GIS)-based compilation of high-resolution geologic maps of Quaternary age and older deposits in southern California from Santa Barbara to San Diego. Special Report 217 (REVISED) merges existing geologic mapping by various authors, and at different scales, into a common seamless format that normalizes and differentiates alluvial fan deposits, related Quaternary deposits, and various older deposits into 40 derivative units at a scale of 100,000 for the entire area.
Service/Hosted Location
Project Website: https://www.conservation.ca.gov/cgs/publications/sr217
Metadata: https://maps.conservation.ca.gov/cgs/metadata/QSD_metadata.html
Webmap: https://maps.conservation.ca.gov/cgs/qsd/
Fault Activity Map of California
The 2010 Fault Activity Map of California presents a much more detailed depiction of faults in California than previous versions. Faults active in the Quaternary (2.6 Ma) were digitized from their original sources in order to preserve as much of the original detail as possible.
Service/Hosted Location
Metadata: https://maps.conservation.ca.gov/cgs/metadata/GDM_006_FAM_750k_v2_metadata.html
Webmap: https://maps.conservation.ca.gov/cgs/fam/
Service: https://gis.conservation.ca.gov/server/rest/services/CGS/FaultActivityMapCA/MapServer
Statewide Airborne Electromagnetic Survey Flight Line Map
The Flight Line Map shows the survey lines where airborne electromagnetic (AEM) geophysical data have been collected as a part of DWR’s Statewide AEM Survey Project. The project is funded through Proposition 68 and surveys are being conducted in all high- and medium-priority groundwater basins, where data collection is feasible. The project started in 2021 and data collection will continue over several years (schedule information can be found on the AEM Survey Schedule webpage). All project datasets are published on the California Natural Resource Agency Open Data Portal by Survey Area on a rolling-basis, with datasets typically becoming available between three and twelve months after surveys are complete. The survey lines displayed on the Flight Line Map are available for download as shapefiles (by Survey Area) on the Open Data Portal.
Additional data products available for each Survey Area include AEM data, supporting data, and data reports. AEM datasets include AEM electrical resistivity data and AEM interpretations. AEM datasets are available to view online through the AEM Data Viewer. Supporting datasets include sorted and digitized lithology and geophysical logs. Datasets are accompanied by data reports, which detail data collection, processing, and interpretation methods as well as figures of the data.
Service/Hosted Location
Dataset at Open Data: https://data.cnra.ca.gov/dataset/aem
CVHM: Central Valley Hydrologic Model
In an effort to aid water managers in understanding how water moves through the aquifer system, predicting water-supply scenarios, and addressing issues related to water competition, the USGS developed a new hydrologic modeling tool, the Central Valley Hydrologic Model (CVHM). The CVHM is an extensive, detailed three-dimensional (3D) computer model of the hydrologic system of the Central Valley (Faunt, 2009). The Central Valley Hydrologic Model (CVHM) simultaneously accounts for changing water supply and demand across the landscape, and simulates surface water and groundwater flow across the entire Central Valley.
Service/Hosted Location
CVHM Web Site:
https://ca.water.usgs.gov/projects/central-valley/central-valley-hydrologic-model.html
Central Valley Hydrologic Model: Texture Model:
https://ca.water.usgs.gov/projects/central-valley/cvhm-texture-model.html
Central Valley Hydrologic Model version 2 (CVHM2): Three-Dimensional Framework Model:
https://www.sciencebase.gov/catalog/item/61fc85a2d34e622189cc090e
The surface of crystalline basement, Great Valley and Sierra Nevada, California: A digital map database:
https://pubs.er.usgs.gov/publication/ofr9596
Reference Layers
This collection of various boundaries and layers is designed to assist local agencies with their responsibilities related to the Sustainable Groundwater Management Act and as an informational tool for all interested parties. The layers in the boundaries tab allow users to overlay numerous Geographic Information Systems (GIS) layers onto a map of California, and allows for those GIS layers to be toggled on and off while varying each layer's transparency. These boundaries are not definitive and do not establish legal rights or define legal boundaries. Each planning layer includes a brief description and a location or source where the user can find additional information regarding that layer. To access these descriptions, within the SGMA data viewer, please toggle the layer on, hover over the expanded options, and click on the options button (looks like three periods) next to each of the layers and select “description” from the dropdown.
Service/Hosted Location - Downloads provided only for DWR authoritative layers
Groundwater Management
Adjudicated Areas - https://data.cnra.ca.gov/dataset/i03-adjudicated-areas
Bulletin 118 Groundwater Basins -2003 - https://utility.arcgis.com/usrsvcs/servers/8977e8590dfe45bc9c846fb888037199/rest/services/Geoscientific/i08_B118_CA_GroundwaterBasins_2003/MapServer
Bulletin 118 Groundwater Basins -2016 - https://utility.arcgis.com/usrsvcs/servers/f09a3e95ef534f77a2e686234f00c498/rest/services/Geoscientific/i08_B118_CA_GroundwaterBasins_2016/MapServer
Bulletin 118 Groundwater Basins -2018 - https://utility.arcgis.com/usrsvcs/servers/49807a1fbc584631bdf88d9ca71dd083/rest/services/Geoscientific/i08_B118_CA_GroundwaterBasins/MapServer
Detailed Analysis Units - Water Plan - https://data.ca.gov/dataset/i03-dau-county-cnty2018
Groundwater Sustainability Agencies - https://data.ca.gov/dataset/i03-groundwater-sustainability-agencies-mapservice
Groundwater Sustainability Plan Areas - https://data.ca.gov/dataset/i03-groundwater-sustainability-plan-areas-mapservice
Exclusive GSA Shapefile Download - https://sgma.water.ca.gov/portal/service/gsadocument/exclusivegsa
GSA Notice Submitted Shapefile Download - https://sgma.water.ca.gov/portal/service/gsadocument/submittedgsa
IRWM Regions - https://data.ca.gov/dataset/i03-irwm-regions
Planning Areas - Water Plan - https://data.cnra.ca.gov/dataset/i03-water-plan-planning-areas
SGMA Critically Overdrafted Basins - https://utility.arcgis.com/usrsvcs/servers/15129538aec84617ba066d1fb14d4fd1/rest/services/Geoscientific/i08_CriticallyOverdraftedBasins/MapServer
SGMA Groundwater Basins Prioritization - https://data.cnra.ca.gov/dataset/sgma-basin-prioritization
Approved Alternative Areas - https://sgma.water.ca.gov/portal/alternative/all
Hydrology
Federal Canals and Aqueducts – https://utility.arcgis.com/usrsvcs/servers/f4da75bd38564758a7a729ae7c8dc94d/rest/services/InlandWaters/i12_Canals__and_Aqueducts_Federal/MapServer/0
Hydrologic Regions - https://data.cnra.ca.gov/dataset/i03-hydrologic-regions
Local Canals and Aqueducts – https://data.cnra.ca.gov/dataset/i12-canals-and-aqueducts-local
State Canals and Aqueducts - https://gis.water.ca.gov/arcgis/rest/services/Structure/i17_StateWaterProject_Centerline/MapServer/0
Watersheds - https://data.cnra.ca.gov/dataset/watershed-boundary-dataset-wbd
Major Rivers and Creeks (NHD): https://data.ca.gov/dataset/nhd-major-rivers-major-rivers-and-creeks-major-lakes-and-reservoirs
Jurisdictions
Assessor Parcels - https://utility.arcgis.com/usrsvcs/servers/338578a8200142c69e3af3eef86a2918/rest/services/Planning/i15_Parcels_Assessor_Lightbox/MapServer
California Conservation Easement Database (CCED) - Not DWR Authoritative Layer
California Drinking Water System Area Boundaries - Not DWR Authoritative Layer
California Protected Areas Database (CPAD) - Not DWR Authoritative Layer
CDFW Owned and Operated Lands and Conservation Easements - Not DWR Authoritative Layer
California Department of Fish and Wildlife (CDFW) Regions – Not DWR Authoritative Layer
DWR Region Office Service Areas - https://data.cnra.ca.gov/dataset/i03-dwr-region-offices
Federal Lands - Not DWR Authoritative Layer
Flood Local Maintenance Areas - https://utility.arcgis.com/usrsvcs/servers/abe344a6df9e4e97a7604f1a56300743/rest/services/Boundaries/i03_Local_Maintenance_Areas_Flood_Protection/MapServer
Regional Flood Planning Boundaries - https://data.cnra.ca.gov/dataset/i03-systemwidepa-20101007
Regional Water Quality Control Board Boundaries - Not DWR Authoritative Layer
State Parks - Not DWR Authoritative Layer
State Refuges - Not DWR Authoritative Layer
Water Agencies - https://data.cnra.ca.gov/dataset/i03-waterdistricts
High-Speed Rail Alignment - https://gis.data.ca.gov/datasets/83492c31c5604917856580447ab09f76/explore
Political
County Boundaries (service provided by CalFire) - https://services1.arcgis.com/jUJYIo9tSA7EHvfZ/arcgis/rest/services/California_County_Boundaries/FeatureServer/0
Tribal Representation Tracts - Not DWR Authoritative Layer - Layers from the Bureau of Indian affairs are subject to the BIA Tract Viewer disclaimer.
Tribal Land Area Representation - Not DWR Authoritative Layer - Layers from the Bureau of Indian affairs are subject to the BIA Tract Viewer disclaimer - https://biamaps.geoplatform.gov/BIA-Opendata/
Tribal Leaders Directory - Not DWR Authoritative Layer - https://www.bia.gov/service/tribal-leaders-directory
Disadvantaged Communities Block Groups - https://data.cnra.ca.gov/dataset/dacs-census/resource/b54e1845-a1da-4a99-b2fd-abf25bc78e3d
Disadvantaged Communities Places - https://data.cnra.ca.gov/dataset/dacs-census/resource/b473d0f4-51be-4b40-b647-291f01e2cece
Disadvantaged Communities Tracts - https://data.cnra.ca.gov/dataset/dacs-census/resource/8174ff98-b783-40a0-8244-b69bd88ceb73
CA Senate Districts - https://services3.arcgis.com/uknczv4rpevve42E/ArcGIS/rest/services/Legislative_Districts_WFL1/FeatureServer/1
2011 State Senate Districts - For Odd Numbered Districts through 2024 - https://services.arcgis.com/aa38u6OgfNoCkTJ6/arcgis/rest/services/2011_Senate_Districts/FeatureServer/0
CA Assembly Districts - https://services3.arcgis.com/uknczv4rpevve42E/ArcGIS/rest/services/Legislative_Districts_WFL1/FeatureServer/0
Best Available Maps
Federal Levees - https://gis.water.ca.gov/arcgis/rest/services/Boundaries/BAM/MapServer/1
Non Federal Levees - https://gis.water.ca.gov/arcgis/rest/services/Boundaries/BAM/MapServer/2
Regulated Streams - https://gis.water.ca.gov/arcgis/rest/services/Boundaries/BAM/MapServer/18
Floodways - https://gis.water.ca.gov/arcgis/rest/services/Boundaries/BAM/MapServer/19
Contact
Paul Shipman
Integrated Data and Analysis Branch
Division of Statewide Integrated Water Management
paul.shipman@water.ca.gov