Lattingtown Beach was one of the sites closed in Nassau...

Lattingtown Beach was one of the sites closed in Nassau after heavy rainfall early in the 2013 beach season. Credit: Jessica Stallone, 2012

The Nassau County Department of Health said Tuesday all of its beaches operating for the 2013 season are open for use.

Nineteen beaches had been closed to swimmers Monday, after heavy rainfall, the department said.

The closings were a precautionary measure, because the stormwater runoff from the rain can elevate bacteria levels and affect bathing water quality, the department said.

To speak with a health department representative about beach closings, call 516-227-9717, 9 a.m. to 4:45 p.m. weekdays.

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Mini-heatwave begins today ... America 250: Rebuilding battle boats ... Trendy Bites: Birria ramen ... Get the latest news and more great videos at NewsdayTV

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