The Natural Resources Defense Council held a news conference in Santa Monica, where they released their annual report called, "Testing the Waters."
The group said pollution continues to contaminate beaches and waters. There were nearly 3,000 beach closings and advisory days last year in Southern California.
Experts say there were also fewer water samples taken because of budget cuts.
The California beaches with the dirtiest water include Avalon Beach in L.A. County, Poche Beach in San Clemente and Pudding Creek Beach in Mendocino County.