The Nassau County Department of Health is advising against swimming at four North Shore beaches, effective Monday, because of heavy rainfall.

The agency said in a news release that swimmers should stay out of the waters at Creek Club in Lattingtown, North Hempstead Beach Park in Port Washington, Piping Rock Beach Club in Locust Valley and Laurel Hollow Beach.

advertisement | advertise on newsday

The advisory is a precautionary measure for beaches known to have substantial storm water runoff caused by heavy rainfall. The runoff can raise bacteria levels so the waters fail to meet the New York State standards for swimming, health officials said.

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.