Water Quality Reports

We are pleased to present the Annual Water Quality Report that shows the high quality of your drinking water. As the water providers to more than 500,000 people, we take great effort and great pride in delivering a product that exceeds all drinking water standards set by the state and federal governments. This report includes water quality data collected throughout 2019 and answers questions you might have about your tap water.

You can be confident your tap water is of a high quality. Frequent testing for water quality and regular improvements in the treatment process keeps your drinking water among the best in the country.

Water Quality Reports

2019 Annual Water Quality Report (PDF)


If you have questions about the tap water in your community, please call your water provider using the contact list below.

Water ProviderContact PersonContact Telephone
Contra Costa Water District
Erin Gomez925-688-8091
City of Antioch
Laura Villasana
City of Martinez 
Hiren Patel
City of Pittsburg 
Ana Corti
Diablo Water District 
Nacho Mendoza
Golden State Water Company 
City of Brentwood 
Eric Brennan