nav-menu-lower-w-bdr-PNGv2 Employment-Jobs Kids I Want To... Get Involved Park Planning Stewardship - Resources News Publice Meetings

Lake Anza | Tilden Regional Park

Lake Anza Water Sampling Site Location

Current Water Quality Conditions and Available Test Results PDF

Lake Anza Beach is tested for bacterial levels weekly from April to October. This map shows the two sample sites across the beach. The East Bay Regional Park District works with the Contra Costa County Environmental Health Department in accordance with California Department of Public Health's Guidance for Fresh Water Beaches to determine water quality at Lake Anza Beach. Our stop light sign is used to display the relative water quality from our latest bacteriological tests.


Water Quality Stop Light Designations:


Water safety indicator


Please be advised there is always some level of risk when swimming in any water body. To have a fun and safe experience swimming in the parks, we encourage you to follow a few simple rules:


* Keep water out of your mouth
* After you leave the water, shower and towel dry as soon as possible
* Do not swim in the lake for 3 days after a rainstorm
* Check posted signs for water quality information

For more information contact the East Bay Regional Park District Water Management Department at (510) 544-2328

Water ResourcesLink | Tilden Regional Park Facilities Link | All Park District Swim Facilities Link