Mothers Beach suffers from very poor water circulation leading to chronic bacterial exceedances, placing it ninth.
The report assesses 700 Pacific Coast beaches from Washington to Baja.
This year saw an overall quality decline across the state, attributed to winter storm runoffs.
Santa Monica PierRobin L Marshall/Getty Images
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Out of the water, the news was no better.
There, a 14-year-old boy was attacked.
Police report that the boy was transported to a nearby hospital.
The police shut down the Pier a half-hour earlier than its usual closing time of 11 PM.
Santa Monica MPD said additional disturbances were reported at 4th and Colorado as the group moved east.
