The city of Lakeville closed the Valley Lake beach after water tests indicated unacceptable levels of E. coli bacteria, ECM publishers reports.
Officials plan to retest the water daily until the water is safe for swimming.
Late last week, state health officials confirmed three E. coli illnesses linked to swimming in Lake Minnetonka, which was the state's first waterborne outbreak of the summer.
E. coli illness symptoms include stomach cramps and diarrhea. Here's more info about E. coli from the state health department.