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Resources - Disadvantaged Communities (DAC) Mapping Tool

The Department of Water Resources (DWR) has developed 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 the following three US Census geographies as separate data layers:

  • Census Place
  • Census Tract
  • Census Block Group

Only those census geographies that meet the DAC definition are shown on the map (i.e., only those with an annual median household income (MHI) that is less than 80 percent of the Statewide annual MHI (PRC Section 75005(g))). In addition, those census geographies having an annual MHI that is less than 60 percent of the Statewide annual MHI are shown as "Severely Disadvantaged Communities" (SDAC).

The specific dataset used in the tool is the US Census American Community Survey (ACS) 5-Year Data: 2010 - 2014 (with an MHI of $61,489 and hence calculated DAC and SDAC thresholds of $49,191 and $36,893, respectively).

Other Geographic Information Systems (GIS) layers relevant to the IRWM Grant Program are also shown on the map. All GIS layers can be toggled on and off while varying each layer's transparency. Each map layer includes a brief description and a location or source where the user can find additional information regarding that layer.

Application Use Disclaimer

This application provides a graphic representation of DAC data and IRWM Grant Program related boundaries and is intended for informational purposes only. The boundaries shown are not definitive and do not establish legal rights or define legal boundaries.

Available below is an ArcGIS Map Package of the data used in the tool that can be downloaded from the link provided and opened using ArcGIS software (ArcGIS is a paid subscription).

Click HERE for help with downloading and using a map package.

**Click here to open the Disadvantaged Communities Mapping Tool**

User Experience Tips

The DAC Mapping Tool functions in the most recent version of Internet Explorer, Mozilla Firefox, and Google Chrome; however, Chrome may provide the best user experience. For questions or more information about the map interface, please review the help document.

Known Issues
  • The application does not function in Internet Explorer 8 or earlier.
  • The search feature does not function in Internet Explorer 9.
  • Transparency occasionally doubles in Internet Explorer 9. If you are having trouble with the transparency, pan the map view and this should correct the issue.

If you are having trouble with the application and would like to provide us with feedback, please include the name of the browser you are using (Internet Explorer, Google Chrome, Mozilla Firefox, Safari, etc.) and the browser mode or version, as this helps the development process.

If you have questions about the presentation of data in the map, or have other comments, please provide them directly to Tanya Meeth, in the Financial Assistance Branch, at

Additional DAC Resources