Drinking water systems imperiled by failing infrastructure
![Drinking water systems imperiled by failing infrastructure](http://bloximages.chicago2.vip.townnews.com/lacrossetribune.com/content/tncms/assets/v3/editorial/6/1b/61bf6bd9-54ef-5cd4-8a74-2338181bb7a8/5606b3b101f8b.image.jpg?resize=300%2C200)
DES MOINES, Iowa (AP) — Deep inside a complex of huge tanks, drinking water for Iowa's capital city is constantly cleansed of the harmful nitrates that come from the state's famously rich farmland.