DES MOINES, Iowa (WOI) – The Iowa Department of Natural Resources has categorized nine Iowa beaches as “not recommended for swimming” because of high E.coli reports in the water.

This advisory went into effect on Friday, and goes through Labor Day. Beaches that exceed Iowa’s geometric mean water quality standard for bacteria (the geometric mean of 5 samples in a 30-day period exceeds 126 colony forming units of E. coli bacteria per 100 ml of water) will be posted with signs that state, “Swimming is Not Recommended”.

Two Siouxland beaches affected include Denison Beach at Black Hawk State Park in Sac County and Gull Point Beach at Gull Point State Park in Dickinson County.

The other beaches are as follows:

  • Lake Keomah Beach at Lake Keomah State Park in Mahaska County
  • George Wyth Beach at George Wyth Memorial State Park in Black Hawk County
  • Beed’s Lake Beach at Beed’s Lake State Park in Franklin County
  • McIntosh Woods Beach at McIntosh Woods State Park in Cerro Gordo County
  • Nine Eagles Beach at Nine Eagles State Park in Decatur County
  • Lake Macbride Beach at Lake Macbride State Park in Johnson County
  • Backbone Beach at Backbone State Park in Delaware County

The advisory remains in effect until the geomean drops below the water quality standard.

You can monitor which beaches have certain recommendations on the DNR’s website.