Data and Tools

We have a long history of data collection, monitoring, and reporting. With the passage of the Sustainable Groundwater Management Act (SGMA), there is an increased need for local and state agencies and the public to easily access water data in order to make informed management decisions.

Data Tools Fact Sheet
Data Tools and Reports Fact Sheet | (Publish Date:
Quick reference guide to data, tools and guidance that help Groundwater Sustainability Agencies (GSAs) develop Groundwater Sustainability Plans (GSPs), and implement the requirements of the Sustainable Groundwater Management Act (SGMA).

Screen shot of the California Natural Resources Agency Open Data Platform home page.California Natural Resources Agency Open Data Platform

The CNRA Open Data Platform has been developed to provide data to State of California citizens, agencies, and interested stakeholders in a transparent and useful manner. The Open Data Platform supports the CNRA organizations’ and programs’ missions by providing an environment to publish and share useful data that can be effectively utilized by all.






Screen shot of the California Department of Water Resources Land Use ViewerDWR's SGMA Portal

DWR's SGMA Portal allows local agencies, groundwater sustainability agencies (GSAs), and watermasters to submit, modify, and view the information required by the Sustainable Groundwater Management Act (SGMA). It also enables you to view submitted information and provide comments, where applicable. You don't need a login for public access.






 Screen shot of the Water Data Library home page.The Water Data Library

The Water Data Library contains hydrologic data (groundwater level data and some groundwater quality data) for over 35,000 wells in California. The data is collected by DWR Region Offices and dozens of local and federal cooperators.







Screen shot of the California Statewide Groundwater Elevation Monitoring ProgramCalifornia Statewide Groundwater Elevation Monitoring (CASGEM) Program

California Statewide Groundwater Elevation Monitoring (CASGEM) Program - In 2009, the Legislature passed SBX7 6, which establishes, for the first time in California, collaboration between local monitoring parties and DWR to collect groundwater elevations statewide and that this information be made available to the public.

SGMA Data ViewerSGMA 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 purpose of supporting GSP development and implementation.

View the two-page SGMA Data Viewer Fact Sheet for more information about this application.






NC Dataset ViewerNatural Communities Commonly Associated with Groundwater (NCCAG) Dataset Viewer

The NC Dataset Viewer provides efficient access to the Natural Communities dataset and related source datasets, allowing both query and download of features in the NC Dataset and query of source data sets used in the development of the NC Dataset.

View the Summary Document to learn more about the Natural Communities dataset.





Screen shot of California Department of Water Resources Land Use Viewer. California DWR Land Use Viewer

The CADWR Land Use Viewer allows you to easily view and download both statewide (as recent as 2014 crop data) and existing county land use datasets that have been collected over the last 30 years. The application also enables you to filter crop specific information and visualize land use change over time. Learn more about the Viewer in the Land Use Fact Sheet or view the SGMA Tech Talk webinar for a demo on how to use it.






WCR Mapping ApplicationCalifornia DWR Well Completion Report Map Application

The Well Completion Report Map Application provides direct statewide access to copies of Well Completion Reports. Well Completion Reports 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.






GICIMAGroundwater Information Center Interactive Map Application

The Groundwater Information Center Interactive Map Application allows you to view individual Geographic Information Systems (GIS) layers containing geospatially-referenced groundwater-related information, and download these layers as GIS shapefiles or GeoTIFF raster files.







GICIMAWater Management Planning Tool

The Water Management Planning Tool is an interactive map application that allows you to overlay numerous Geographic Information Systems (GIS) layers onto a map of California. Each planning layer includes a brief description and a location or source where you can find additional information regarding that layer.






GICIMAGroundwater Basin Boundary Assessment Tool (BBAT)

The The Groundwater Basin Boundary Assessment Tool (BBAT) is a web-based application to inform local agencies and the public about the existing Bulletin 118 groundwater basins and other relevant geologic and geographic data.







GICIMADisadvantaged Communities (DAC) Mapping Tool

The The Disadvantaged Communities (DAC) Mapping Tool is a web-based application to assist local agencies and other interested parties in evaluating disadvantaged community (DAC) status throughout the State, using the definition provided by Proposition 84 IRWM Guidelines (2015). The DAC Mapping Tool is an interactive map application that allows users to overlay three US Census geographies as separate data layers:1) Census Place, 2) Census Tract, 3) Census Block Group.

View FAQ
DWR Integrated Hydrologic Models and Water Budget Pilot Projects FAQ ( ) | (Revision Date: (Publish Date: Version: 1
These frequently asked questions (FAQ) have been addressed by DWR’s staff working on the enhancement of publically available tools, such as the California Central Valley Groundwater-Surface Water Simulation Model (C2VSim) and the Integrated Water Flow Model (IWFM). These tools are being enhanced by the California Department of Water Resources (DWR) to foster and improve understanding of groundwater conditions (including the preparation of water budgets) at the State and regional levels.
View Fact Sheet
DWR Modeling Tools Fact Sheet ( ) | (Revision Date: (Publish Date: Version: 1
The California Department of Water Resources (DWR) has prepared this fact sheet to inform local agencies and stakeholders about DWR’s integrated hydrologic modeling codes and applications, including their current status and plans for future development. Note that any future timelines mentioned in this document are subject to change.

DWR is providing data, tools, and guidance to assist GSAs with incorporating climate change into their GSPs. This effort leverages previous work done by DWR for the California Water Commission Water Storage Investment Program (WSIP). The intent is to provide GSAs with a possible method to include climate change into their projected water budget calculations, especially if no local climate change analysis has been done before.

Screen shot of Open Data Platform CNRA Open Data Platform - SGMA Climate Change Resources

The climate change resources are available through the CNRA Open Data Platform. These resources include the data, tools, and guidance in a single location and the access to download the desktop tools. These desktop tools are designed to assist users of the climate change data and processing the climate change projections to integrated hydrologic models.

CNRA Open Data Platform Climate Change ToolboxClimate Change Tools


The ArcGIS tools are developed to assist users in developing projected precipitation and evapotranspiration input files for models.

The Second Order Correction Tool is to assist users in correcting streamflow timing under projected conditions.

Climate Change Resource Guide Cover
Resource Guide | (Publish Date:
The Resource Guide gives GSAs and other stakeholders a high-level overview of the climate change resources including datasets provided by DWR, tools for working with the DWR-provided datasets, and guidance for using DWR-provided data and tools in developing GSPs. The datasets and methods can provide technical assistance to GSAs for developing projected water budgets.
Tags: Groundwater-Management, Sustainable-Groundwater-Management-Act, Climate-Change, Groundwater-Sustainability-Plans, Sustainable-Groundwater-Management-Act, Hydrology, Data
Climate Change Guidance Document Cover
Guidance for Climate Change Data Use During Sustainability Plan Development ( PDF) | (Publish Date:
The objective of this Guidance Document is to provide Groundwater Sustainability Agencies (GSAs) and other stakeholders with information regarding climate change datasets and related tools provided by the California Department of Water Resources (DWR) for use in developing Groundwater Sustainability Plans (GSPs). The datasets and methods are provided as technical assistance to GSAs to develop projected water budgets.
Tags: Groundwater-Management, Sustainable-Groundwater-Management-Act, Climate-Change, Groundwater-Sustainability-Plans, Sustainable-Groundwater-Management-Act, Hydrology, Data
View Fact Sheet
Climate Change Fact Sheet ( PDF) | (Revision Date: (Publish Date: Version: 1
This fact sheet describes the Sustainable Groundwater Management Program (SGMP) Technical Assistance Climate Change Analysis data sources and application of Climate Change Data for Sustainable Groundwater Management Act (SGMA) Implementation.
Tags: Groundwater-Management, Climate-Change

Statewide Groundwater Level Change Maps

Spring Seasonal GW Change Maps  


Fall Seasonal GW Change Maps


Statewide Groundwater Level Change Summarized by Hydrologic Region "Piemaps"

Spring Seasonal Piemaps


Sacramento Valley Groundwater Elevation Change

Shallow Wells

Deep Wells

Intermediate Wells

100ft to 450ft Wells

Observation Wells

Proposition 68 Technical Support Projects

The Department of Water Resources (DWR) is leading eight Proposition 68-funded projects managed through the Sustainable Groundwater Management Program. These projects provide groundwater sustainability agencies, related stakeholders, and the public with regional and statewide data, tools, and analysis aligned with the technical requirements of the groundwater sustainability plan (GSP) regulations and the Sustainable Groundwater Management Act (SGMA).

The projects can help GSAs successfully develop and implement GSPs. These activities also allow DWR to adequately evaluate GSPs within the statutory deadlines of SGMA. The projects will provide publicly available data to facilitate additional water management activities including groundwater recharge and conjunctive use which will contribute to drought resilience and regional sustainability. The data collection, tool development, and analysis efforts will be focused in the critically overdrafted groundwater basins and in high- and medium-priority basins across the state. Below are fact sheets for each of the projects:

Proposition 68-Funded Project Fact Sheets:

For information on the Sustainable Groundwater Management Grant Program, please visit the Sustainable Groundwater Management Grant Program webpage.


DWR and other agencies are developing guidelines, tools, best management practices, and regulations to assist local agencies with their sustainable groundwater management planning efforts. Statewide and regional foundations, academic institutions, nonprofit organizations, and groups within and outside of California have prepared reference documents, presentations, case studies, and conceptual models intended to help local agencies make informed decisions about sustainable groundwater management. DWR makes these resources available to the public through its Sustainable Groundwater Management website; however, does so for the convenience of the user and is not responsible for its content.

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