Swimming advisories were issued Friday for 19 Nassau County beaches and 62 in Suffolk.

The Nassau County Department of Health is telling swimmers to stay out of the water at 14 North Shore beaches and five on the South Shore.

Suffolk County’s Department of Health Services advised against swimming at 62 of its beaches and said two — Lake Ronkonkoma (Islip) and Benjamin Beach in Bay Shore — remained closed.

The advisories are precautionary measures for beaches known to have substantial storm-water runoff caused by heavy rainfall. The runoff can raise bacteria levels, which results in the waters failing to meet New York State standards for swimming, health officials said.

In Nassau, the 14 North Shore beaches are:

  • Centre Island Sound, Bayville;
  • Creek Club Beach and Lattingtown Beach, both in 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;
  • Theodore Roosevelt Beach, Oyster Bay;
  • Sea Cliff Village Beach, Sea Cliff;
  • Ransom Beach, Soundside Beach and Stehli Beach, all in Bayville;
  • Tappen Beach, Glenwood Landing.

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The five South Shore beaches include:

  • Biltmore Beach Club and Philip Healey Beach, both in Massapequa;
  • Hewlett Point Beach, East Rockaway;
  • Island Park Beach, Island Park;
  • Merrick Estates Civic Association, Merrick.

In Suffolk, the swimming advisory covers areas that are heavily influenced by stormwater runoff from the surrounding watersheds and/or adjacent tributaries. Their locations, in enclosed embayments, limit tidal flushing, the agency 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.

Nassau health officials said the advisory is likely to be lifted at 10 a.m. Saturday, provided there is no additional heavy rainfall or water samples don’t show elevated bacterial levels.

For updates in Suffolk, call the bathing beach hotline at 631-852-5822 or check the health department’s beach monitoring web page at suffolkcountyny.gov/Departments/HealthServices.aspx.