Lake Anza's swim season started on April 26 and has garnered significant attendance, especially on sunny days. The lake faced closures from 2020 to 2022 due to harmful algae blooms. Last year, an bloom limited the swimming season to 77 days. Following treatments by the East Bay Regional Park District, water quality has improved, making it safe for swimming with E. Coli levels below health standards. However, the underlying issue causing algae blooms remains, and a permanent solution will not be implemented until at least 2026.
The swim season this year at Lake Anza, which began on April 26, has been busy, with 700 people visiting on hot days and around 100 people in the water at once.
Lake Anza was entirely closed to swimmers from 2020 to 2022 due to toxic blue-green algae, and danger advisories last year limited the swimming season to just 77 days.
After treatments by the East Bay Regional Park District earlier this year, the lake is currently safe for swimmers, with E. Coli levels below state health standards.
The underlying problem that led to last year's algae bloom remains unsolved, with the park district not attempting a permanent solution until at least 2026.
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