"Manure contains many pathogens, including E. coli and coliform bacterias, that can harm people and animals. When liquified, the manure more easily flows into waterways or seeps into groundwater, said Jason Lowery, spills response team leader for the DNR.
Areas in central and northeastern Wisconsin are particularly vulnerable to contamination because of sandy and rocky soils that allow liquids to seep through more easily and quickly, DNR officials and local conservationists said.
Nearly one-third of private drinking wells in Kewaunee County are contaminated with high levels of bacteria, according to a petition sent by local conservationists to the Environmental Protection Agency in October. The petition asserts large farms are behind the contamination.
In Dodge County, 21 percent of wells tested positive for coliform bacteria and 10 percent had E. coli, according to a 2012 land and water resources plan."
http://www.greenbaypressgazette.com/story/news/investigations/2015/02/06/manure-spills-water-supply/22983669/
http://www.wired.com/2009/05/swineflufarm/
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