Lake Ronkonkoma Beach in the Town of Islip reopened Thursday after having been closed to bathing, according to the Suffolk County health department. The beach was closed Wednesday as a result of excessive levels of blue-green algae.

Remaining closed is the lake swim area of Peconic Dunes County Park on Great Pond, Peconic, closed to bathing on Aug. 11, health officials said.

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Beaches will remain closed until the water quality is deemed acceptable, with sampling conducted in most cases on a daily basis, officials said.

Learn the latest on affected beaches at the Bathing Beach Hotline at 631-852-5822 or check