A swimming advisory has been issued for McIntosh Woods State Park in Cerro Gordo County due to E. coli contamination.
The Iowa Department of Natural Resources’ weekly sampling at McIntosh Woods State Park in Ventura exceeded the one-time sample maximum of 235 E. coli per 100 milliliters of water with a reading of 20,000 on Monday, July 1.
Swimming is not recommended at McIntosh Woods Beach on Clear Lake, the DNR’s water quality monitoring site says.
High levels of bacteria are attributed to fecal contamination of beach water from improperly constructed and operated septic systems and sewage treatment plants, manure spills, storm water runoff from land with wildlife and pet droppings.
According to the DNR, surface runoff after a heavy rainfall may transport high levels of fecal bacteria to the water at the beach. It also increases the sediment in the water causing it to be murky.
Jim Sholly, CLEAR Project coordinator, said sunlight will destroy the bacteria and improve the water quality.
CLEAR Project aims to promote and enhance water quality of Clear Lake in North Iowa.
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