Suffolk County health officials issued an advisory Sunday against swimming at 14 beaches until at least Monday morning following heavy rainfall over the weekend.

The potential for excessive levels of bacteria because of the rainfall prompted the advisory, according to a news release from the county’s Department of Health Services.

The county’s advisory is to lift at 7 a.m. Monday, unless water samples show higher levels of bacteria have continued after a 24-hour period, the release said.

The affected beaches “are located in areas that are heavily influenced by storm water runoff from the surrounding watersheds and/or adjacent tributaries and because of their location in an enclosed embayment, experience limited tidal flushing,” the release said.

The beaches are:

Amityville Village Beach, Tanner Park Beach and Venetian Shores Beach in Babylon; Corey Beach and Shirley Beach in Brookhaven; and West Islip Beach, Benjamins Beach, Islip Beach, East Islip Beach, West Oaks Recreation Club Beach, Brightwaters Village Beach, Bayport Beach, Sayville Marina Park Beach, Bayberry Beach & Tennis Club Beach in Islip.

Lake Ronkonkoma continues to be closed to bathers because of excess bacteria.

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For more information, call the Bathing Beach HOTLINE at 631-852-5822, contact the Department of Health Services’ Office of Ecology at 631-852-5760 during normal business hours, or visit Suffolk County Department of Health Services’ beach monitoring website at