Tests have concluded that the water has a level of bacteria exceeding health standards at Santa Monica Pier, Malibu Lagoon at Surfrider Beach, Mother's Beach in Marina Del Ray and Escondido State Beach.
Officials don't know what is causing the unhealthy bacteria levels, as they usually occur after a storm.
Due to the bacteria levels exceeding health standards, the public is being urged to stay out of the water at the beaches listed above.