Health officials are urging beach goers not to go into the water at four Duluth beaches that have tested positive for elevated E. coli bacteria. The Northland NewsCenter has the list of contaminated beaches.

Recent warm weather and heavy rains may have contributed to high levels of e-coli bacteria at some Minnesota beaches. Duluth officials have advised people to stay out of the water at three beaches and Minneapolis closed a Lake Harriet beach.

Theodore Wirth Lake Beach in Minneapolis has been closed temporarily after it tested positive for E. coli bacteria that exceeded state guidelines. The rise in bacteria levels is likely caused by more birds at the lake since the start of migration season. No illnesses have been reported. The lake will be re-tested Wednesday.

Foley residents are being instructed to boil all water before using it after E. coli was detected in the city's water supply. The city says the contamination may be due to a failure to chlorinate properly, and officials await updated test results from the Department of Health.

Concerned about elevated levels of E. coli bacteria following last month's floods, the Minnesota Pollution Control Agency is continuing to conduct water sampling in Carlton County after raw sewage swept into the Moosehead Lake and the river access on the Moose Horn River near Sturgeon Lake.

E. coli can come from a number of different sources – including poop, farm runoff, or even soil.

E. coli can come from a number of different sources – including poop, farm runoff, or even soil.