Two Wisconsin icons, dairy cows and fresh water, appear to be at war.  Two new studies from USDA scientists finds that, in Northeast Wisconsin, cow manure flowing into drinking waters accounts for 76% of human gastrointestinal illnesses.  Worse yet, the normal response — digging a deeper well — may be of little protection.  Thousands of private wells in Northeast Wisconsin have been declared unfit to drink and the new studies call into question the effectiveness of regulations to protect drinking water.  Coburn Dukehart from the Wisconsin Center for Investigative Journalism joins us with the story.