WOODBURY - The Nassau County Department of Health issued an advisory Saturday against swimming at 19 beaches in the county due to elevated levels of bacteria.

The advisory is a precautionary measure for beaches that are typically impacted by stormwater runoff following heavy rains, the county says. Parts of Nassau saw downpours Friday night as strong storms swept through the area.

"Stormwater runoff can impact bathing water quality by elevating bacteria levels, which may cause exceedances of the New York state standard for bathing water quality," the Health Department said in a statement.

For up-to-date recordings on closings and openings, residents can call 516-227-9700.

14 affected North Shore Beaches within Nassau County:
Centre Island Sound – Bayville
Creek Club – Lattingtown
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 – Bayville
Tappen Beach – Glenwood Landing

5 affected South Shore Beaches within Nassau County:
Biltmore Beach Club – Massapequa
Hewlett Point Beach – East Rockaway
Island Park Beach – Island Park
Merrick Estates Civic Association – Merrick
Philip Healey Beach – Massapequa