Nassau County health officials said Wednesday that swimmers should stay out of the water at 14 North Shore beaches because of the chance of high bacteria levels.

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, according to the Nassau County Department of Health.

The beaches include: Centre Island Sound, Oyster Bay; Creek Club and Lattingtown Beach, Lattingtown; Laurel Hollow Beach, Laurel Hollow; Morgan Sound, Glen Cove; North Hempstead Beach Park, Port Washington; Piping Rock Beach Club, Locust Valley; Pryibil Beach, Glen Cove; Ransom Beach, Bayville; Theodore Roosevelt Beach, Oyster Bay; Sea Cliff Village Beach, Sea Cliff; Soundside Beach, Bayville; Stehli Beach, Locust Valley; and Tappen Beach, Sea Cliff.

In Suffolk County, health officials said Wednesday that Lake Ronkonkoma beach remains closed because of elevated bacteria levels.

Head of the Bay Club Beach in Huntington Bay has been reopened for swimming after being closed Monday.

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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.

Information on Suffolk County beach closings is available by calling the Bathing Beach hotline, 631-852-5822, or by calling the department's Office of Ecology, 631-852-5760.