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Nichols, a town of about 340, is among a number of smaller communities where residents utilize individual, shallow wells for their drinking water. The wells are highly susceptible to contamination.
Residents in Nichols and many other rural Iowa towns use shallow wells that are susceptible to contamination from factories and farm fields.
John O'Connell was told his water was finally safe to drink again. Four years later, a test showed it has unsafe amounts of nitrate.