The five year baseline E. coli testing of the Lake of the Ozarks is complete after clean tests are returned this week. The twelve samples taken Monday from the Brown Bend area at Mile Marker 61 to the Highway 65 Bridge at Mile Marker 91 showed no elevated levels of E. coli.
Since the baseline study began back in 2007, the Missouri Department of Natural Resources and volunteers from the Lake of the Ozarks Watershed Alliance have taken over sixteen hundred samples from sites from Bagnell Dam to Truman Dam. Just over forty of those samples, or 2.6%, were in excess of the Environmental Protection Agency’s single sample maximum for E. coli at swimming beaches.
Geometric means for the areas tested were 5 for year one, 7.6, 8.8, 3.8 and 3.0 for the following years, all well below the 126 geometric mean that is considered unsuitable for swimming.