The Galveston County Health District says concentrated amounts of bacteria are present at 12 locations along the Bolivar Peninsula.
The peninsula is a narrow strip of land on the Gulf Coast in eastern Galveston County, about 50 miles southeast of Houston.
District officials issued the no-swimming advisory Tuesday. They regularly test water conditions in the area, and additional testing will determine how long the advisory will continue.
No elevated levels were found on nearby Galveston Island.
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