Drinking Water Source Assessment and Protection Program

Source Water Assessments - Public Access


There are over 15,000 active public water system sources in California. To date, Source Water Assessments have been submitted for over 95% of the sources, and most of these were submitted electronically. Because the full report contains confidential information, only a summary is provided here. Each summary Assessment report includes results from the Assessment, a brief description of the Drinking Water Source Assessment and Protection (DWSAP) program and the procedures used in the Assessment process.

Assessment summaries are not available for some sources. This is because:

To find and view Source Water Assessments, click on the button below. Or, keep reading to find out more.



What is a Source Water Assessment?

An Assessment is an evaluation of a drinking water source to determine the “possible contaminating activities” (PCAs) to which the source is most vulnerable. PCAs are current or historic human activities that are actual or potential origins of contamination for a drinking water source. PCAs include activities that use, store, produce or dispose of chemicals that have the potential to contaminate drinking water supplies.

The Assessment includes: a delineation of protection zones around the source; an inventory of the types of PCAs within the source protection zones; and an analysis to determine the PCAs to which the source is most vulnerable. The information is compiled into a report that includes a map, calculations, checklists, and a summary of the findings.

For more information, contact the agency or individual that prepared the Assessment. You may also contact the local Department of Health Services Drinking Water Field Operations Branch district office. Please see the DHS District Office map.

Additional information about Assessments can be found at the Department of Health Services DWSAP webpage.



Questions or comments, contact Rob Coman