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.
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.