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:
- The Assessment has not been completed. Contact the local Department of
Health Services (DHS)
Drinking Water field office or the water system to find out when the Assessment is scheduled to be done.
- The source is not active. It may be out of service, or new and not yet in
- The Assessment was not submitted electronically. This site only provides access
to Assessment summaries submitted electronically.
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
District Office map.
Additional information about Assessments can be found at
the Department of Health Services DWSAP webpage.
Questions or comments, contact Rob Coman