Fonda, Iowa
Des Moines, which lies  south and east of Fonda, receives a large portion of its drinking water from the Raccoon River (and thus Big Cedar Creek). From 1978 to 2004, contamination at its water intake plant due to nitrates (an agrichemical) has increased from 4.5 mg/L to 7.7 mg/L. Nitrate consumption is linked to blue baby syndrome.