Both Suffolk and Nassau counties have issued advisories against swimming at numerous beaches, because of concerns over increased bacteria levels resulting from Friday’s heavy rainfall, health officials said.

In Suffolk, 65 beaches are under an advisory, including Tanner Park Beach in Copiague, Havens Beach in Easthampton and Lloyd Neck Bath Club Beach in Huntington.

The advisory in Suffolk was expected be lifted at 3 p.m. Saturday, unless water samples reveal elevated bacterial levels that exceed New York State standards.

In Nassau, 19 beaches are under an advisory, including Philip Healey Beach in Massapequa, Theodore Roosevelt Beach in Oyster Bay and Laurel Hollow Beach in Laurel Hollow.

The advisory was expected be lifted at 2 p.m. Saturday for the Nassau beaches, unless water samples reveal elevated bacterial levels.

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Health officials said the advisories were a precautionary measure for beaches known to be in areas affected by runoff caused by heavy rainfall, with that runoff able to elevate bacteria to levels exceeding the New York State standard.

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

For the latest information on affected Suffolk County beaches, call the bathing beach hotline at 631-852-5822.