By Tony Leys for KFF Health News.Broadcast version by Mark Moran for Iowa News Service reporting for the Rural Democracy Initiative-Public News Service Collaboration Allison Roderick has a warning and a pledge for rural residents of her county: The water from their wells could be contaminated, but the government can help make it safe. Roderick is the environmental health officer for Webster County in north-central Iowa, where a few thousand rural residents live among sprawling corn and soybean fields. Many draw their water from private wells, which are exempt from most federal testing and purity regulations. ...