The Los Angeles County Department of Public Health has issued an Ocean Water Use Warning for parts of Manhattan Beach, meaning that ocean water bacteria levels currently exceed safe standards for swimmers or surfers in those areas.

The "yellow light" warning was in effect for beaches at 40th Street and at the Manhattan Beach Pier (although there was a "green light" - meaning no warning - at the water quality observation station at Bruce's Beach, located between those two spots).

A "green light" is present when ocean water bacteria levels meet state standards. The "yellow" signal is raised when bacteria exceeds state levels and may cause illness. It is intended as a caution for swimmers and surfers. 

A "red light" indicates that the ocean water is closed due to sewage-contaminated water or another health hazard. 

There was no reason given for the yellow warning in Manhattan Beach, although there were similar warnings in parts of Hermosa Beach and Redondo Beach.

Swimmers and surfers are urged to check back at the L.A. County Department of Health Beach Water Quality Advisory page for updates. 

(In the meantime, why not spend the weekend on land at the Manhattan Beach 10K and the Manhattan Beach Hometown Fair?)