Nassau County health officials have closed a Glenwood Landing beach and are advising the public against swimming Saturday at 18 other beaches across the county.

County officials said the Saturday advisory was issued as a precautionary measure for beaches that have been previously identified as being impacted by storm water runoff.

Tappan Beach in Glenwood Landing was closed effective Saturday as a result of elevated bacteria levels until further notice, Nassau Health Department spokeswoman Mary Ellen Laurain said.

Thirteen North Shore beaches fall under the advisory, including: Centre Island Sound, Ransom, Stehli and Soundside beaches in Bayville; Creek Club and Lattingtown Beach in Lattingtown; Laurel Hollow Beach in Laurel Hollow; Morgan Sound and Pryibil Beach in Glen Cove; North Hempstead Beach Park in Port Washington; Piping Rock Beach Club in Locust Valley; Theodore Roosevelt Beach in Oyster Bay; and Sea Cliff Village Beach in Sea Cliff.

Five South Shore beaches are also under the advisory: Biltmore Beach Club and Philip Healey Beach in Massapequa; Hewlett Point Beach in East Rockaway; Island Park Beach in Island Park; and Merrick Estates Civic Association in Merrick.

The advisory is expected to be lifted at 9 a.m. Sunday, Laurain said.

For updated, recorded information on beach openings and closings, call the health department at 516-227-9700.

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Nassau warns against swimming at 18 beaches due to bacteria levels - Newsday