Lake Temescal | Temescal Regional Recreation Area

Water Quality Conditions
 • Current Water Quality Conditions Report [PDF]

Lake Temescal Beach is tested for bacterial levels weekly from April to October. The map below indicates the sample sites on the beach. The East Bay Regional Park District works with the Alameda County Environmental Health Department in accordance with California Department of Public Health's Guidance for Fresh Water Beaches to determine water quality at Lake Temescal Beach. Our stop light sign is used to display the relative water quality from our latest bacteriological tests and cyanobacteria (blue-green algae) conditions.

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

Lake Temescal Water Sampling Site Location

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