The number of southeastern Minnesota household wells that are contaminated with potentially dangerous nitrates could increase by about 50 percent in coming years, a University of Minnesota study shows.
The potential problem stems from high grain prices in recent years that led farmers to convert grasslands to plowed fields, said researcher Bonnie Keeler, lead scientist at the university's Institute on the Environment. It could force homeowners and local governments to spend millions of dollars to treat their water, the report said.
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