The Nassau County Department of Health said Tuesday it is advising against swimming at five South Shore beaches because of bacteria concerns.

The advisory is a precautionary measure for beaches known to have substantial stormwater runoff, which can raise bacteria levels so the waters fail to meet the New York standards for swimming, health officials said.

The agency said swimmers should stay out of the water at Biltmore Beach Club, Massapequa; Hewlett Point Beach, East Rockaway; Island Park Beach, Island Park; Merrick Estates Civic Association, Merrick; and Philip B. Healey Beach, Massapequa.

For recorded information on beach closings and openings in Nassau, call 516-227-9700. Health department representatives are available weekdays, from 9 a.m. to 4:45 p.m., at 516-227-9717.

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