Human sewage is flowing out of municipal storm sewers and into local waterways and Lake Michigan on rainy days without sanitary sewer overflows to blame for the load, and even during periods of dry weather, a three-year study has concluded.

And the contamination cannot be pinned on raccoons or other animals living in the storm sewers. Genetic testing ruled them out.

Human fecal pollution is found at several beaches and rivers throughout the Milwaukee area, creating an unseen though serious public health risk for anyone in the water, said Sandra McLellan, associate scientist at the University of Wisconsin-Milwaukee's Great Lakes WATER Institute and the study's lead researcher.

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