The Nassau County Department of Health advised swimmers Monday to stay out of the waters at four North Shore beaches because of storm-water runoff from heavy rainfall.

Health officials said the runoff can elevate bacteria levels, which may exceed the New York State standard for bathing water quality.

The advisory is a "precautionary measure" and covers Creek Club in Lattingtown, Laurel Hollow Beach in Laurel Hollow, North Hempstead Beach Park in Port Washington and Piping Rock Beach Club in Locust Valley.

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Because of concerns over bacteria after heavy storm-water runoff, health officials frequently close beaches to swimmers as a precautionary measure.

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.