The Suffolk County Department of Health Services on Wednesday lifted a swimming advisory at 64 county beaches.

Because of heavy rainfall, the agency told swimmers to stay out of the waters Monday and Tuesday.

The advisory is a precautionary measure for beaches known to have substantial storm-water runoff caused by heavy rainfall. The runoff can raise bacteria levels so the waters fail to meet the New York State standards for swimming, health officials said.

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DataHow clean is your beach?

Information on Suffolk County beach closings is available by calling the health department's Bathing Beach hotline, 631-852-5822, or by calling the department's Office of Ecology, 631-852-5760.

A list of beach closings is at nwsdy.li/1FkyAWz.