A 2014 study indicated that many of the residential wells in Kewaunee County, Wisconsin, tested positive for both bovine and human feces. The area has 16 large-scale dairy farms, with many of those managing thousands of cows – many more than the traditional farmers that once dominated the area.
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<a href="//commons.wikimedia.org/wiki/Category:Vimeo" title="Category:Vimeo">Vimeo</a>: <a rel="nofollow" class="external text" href="https://vimeo.com/228729115">Residents in Wisconsin face health problems from contamination</a> (<a rel="nofollow" class="external text" href="//web.archive.org/web/*/https://vimeo.com/228729115"><span style="color:#9602fc">view archived source</span></a>)