The Iowa Department of Natural Resources has kept the status of Lake Darling State Park at swimming not recommended after recent test results.
Earlier this month, the status of Lake Darling was changed from okay for swimming to swimming not recommended after an increase in E. coli levels. For status to return to okay for swimming, test samples must not exceed the geometric mean of 126 colony forming units of E. coli per 100 milliliters of water across five samples taken in a 30 day period. The most recent results given on July 13th show the geometric mean at about 590 colony forming units with the highest test sample at 610. The DNR will continue to monitor the water quality for improvements.