Drinking water systems imperiled by failing infrastructure
![Drinking water systems imperiled by failing infrastructure](http://bloximages.chicago2.vip.townnews.com/gazettetimes.com/content/tncms/assets/v3/editorial/f/1e/f1e050df-4e4f-5374-836c-12713fc88822/5606b326a7991.image.jpg?resize=300%2C200)
DES MOINES, Iowa (AP) — Deep inside a 70-year-old water-treatment plant, drinking water for Iowa's capital city is cleansed of harmful nitrates that come from the state's famously rich farmland.