36% of wells tested in Iowa contained arsenic, a naturally occurring elemental poison. Iowa does not mandate testing of private wells, so well owners must rely on voluntary testing. Other contaminants such as nitrates and bacteria can also cause serious health risks. Efforts to require testing of wells when homes are sold have met resistance from some legislators and residents and failed to pass recently.
http://www.desmoinesregister.com/story/news/2016/08/26/testing-shows-danger-iowas-private-wells/88755480/
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