Hundreds of residents picnicked on the grass at Croton Point Park on Sunday, but the beach was closed as a safety precaution.

The Westchester County Department of Environmental Facilities issued an advisory warning people of the probable environmental impact on the Hudson River and surrounding waters after Thursday's accidental main break at the Crotonville Pump Station in Ossining.

Kayakers, boaters and others are warned to avoid the Hudson River from Peekskill to Yonkers.

"A sewer pump system that delivers the sewage from the lines in this community, to the treatment plant broke,” said Tracy Brown, president of Hudson Riverkeeper.

“The untreated sewage, at a rate of reported to be 1 million gallons a day, is going directly into the Croton River and then into the Hudson, instead of getting to the treatment plant."

The break also forced the closure of Philipse Manor Beach.

Crews continue to work to repair the section of 24-inch cast iron pipe, which will be replaced and encased in concrete.

The closures and advisory remain in effect until the repair work is completed.