Three of Nassau County's South Shore beaches have been closed to swimming after heavy rainfall, county health officials said Monday.

The move is a precautionary measure, officials said, because "storm water runoff can have a negative impact by elevating bacterial levels and affecting bathing water quality."

Affected are Hewlett Point Beach, Island Park Beach and Merrick Estates Civic Association.

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Biltmore and Philip Healey beaches in Massapequa remain closed to swimming as a result of elevated bacteria levels.

For the latest on openings and closing, call the county's beach hotline at 516-227-9700.