TYBEE ISLAND, Ga. (WSAV) — Health officials have lifted a beach water advisory for one stretch of Tybee Island, while another remains in place.

On Wednesday, the Chatham County Health Department issued the advisory for Strand Beach at the Pier and Middle Beach at Center Terrace. Routine testing detected levels of bacteria called enterococcus above Environmental Protection Agency standards.

The department lifted the advisory for Middle Beach on Thursday after additional water samples showed bacteria levels had dropped back below the recommended limits.

Meanwhile, Strand Beach — which stretches from 11th Street to 18th Street — is still under the advisory.

Occasional advisories are not unusual for the area. The source of the bacteria could be animal waste, stormwater runoff or boating waste, according to health officials.

When beach water advisories are issued, officials recommend beachgoers refrain from swimming or wading in the ocean, though the beach itself remains open. The health department says any fish caught in the area should be washed extensively.