SAN FRANCISCO, Feb 1 (Reuters) - Nearly three million gallons (11 million liters) of partially treated sewage and storm water spilled into San Francisco Bay off the coast of affluent Marin County, officials said on Friday, just months after a major oil spill hit the bay.

"We are testing the waters near the accident site to determine if there are any public health issues," said Janell Myhre, the emergency services coordinator for Marin County, north of San Francisco.

The spill of 2.7 million gallons (10.2 million liters) into Richardson Bay, an arm of San Francisco Bay, occurred on Thursday evening after a pump at a waste treatment facility failed, Myhre said.

In November, a freighter spilled 58,000 gallons (220,000 liters) of fuel into San Francisco Bay after striking the Bay Bridge connecting San Francisco to Oakland, California, forcing the closure of several beaches and soiling 40 miles (65 km) of shoreline.

Until contamination results from the sewage are available around Saturday morning, Myhre said authorities are posting signs at local beaches to discourage direct contact with bay water and sport fishing until further notice. (Editing by Mary Milliken and Todd Eastham)

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