The Ohio Department of Natural Resources issued a two-day bacteria contamination advisory encouraging children, the elderly, and immunocompromised individuals to avoid swimming in Acton Lake at Hueston Woods due to high bacteria levels Tuesday, June 28.

Individual water samples collected from Hueston Woods’ monitoring location indicated the presence of E. coli Monday, June 27 at 1,119.9 cfu/100 mL and Wednesday, June 29 at 148.3 cfu/100 mL. According to the New Hampshire Department of Environmental Services’ Fact Sheet, E. coli levels from single tests at designated swimming areas should not exceed 88 cfu/100 mL water.

ODNR reported the pollution source for the bacteria contamination advisory as unknown.

Bacteria samples are conducted every two weeks and algae samples as needed to monitor the lake throughout the swimming season, May 30 to Sept. 5.