Health officials are warning the public not to swim at 19 beaches in Nassau County because the beaches may have poor water quality caused by high levels of bacteria.

The Nassau County Department of Health issued the advisory Monday, saying that it's a precautionary measure for beaches known to be impacted by storm-water runoff caused by recent heavy rainfall.

Storm-water runoff can cause bacteria levels to exceed the standard for bathing water quality, the health department said.

The advisory was to be lifted at 1 p.m. Tuesday unless additional heavy rainfall revealed continued elevated bacteria levels.

14 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 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

For up-to-date recorded information on beach openings and closings, call (516) 227-9700.

Top 10 Beaches in the US for 2017 Revealed

Published at 5:56 PM EDT on Jul 24, 2017

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Officials Warn Against Bathing at 19 Long Island Beaches - NBC New York