1993: Manure from dairy cows was linked to the Cryptosporidium contamination of Milwaukee's drinking water, which killed more than 100 people and sickened 400,000.
1996: The Centers for Disease Control linked high nitrate levels in Indiana drinking water wells located near feedlots to spontaneous abortions.
1998: 19 people died from hydrogen sulfide emissions from manure pits, according to the National Institute of Health.
1999: Hurricane Floyd hit North Carolina, causing at least five manure lagoons to burst and 47 to completely flood.
2000: About 1,300 cases of gastroenteritis and six deaths were linked to E. coli-contaminated drinking water in Walkerton, Ontario, most likely from cattle manure runoff.
2001: Nitrates from Seaboard Farms hog operations contaminated drinking water wells. The EPA issues an emergency order so that the company provided safe drinking water to area residents.
Source: Natural Resources Defense Council
May 1, 2011
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