Iowa's water quality and cancer rates forced into forefront of state politics

Chemical fertilizers and animal waste contain nitrates and phosphorus that can get washed with rain or snowmelt into the state's rivers. That affects Iowa's more liberal urban centers which rely on rivers and lakes for drinking water.

Chemical fertilizers and animal waste contain nitrates and phosphorus that can get washed with rain or snowmelt into the state's rivers. That affects Iowa's more liberal urban centers which rely on rivers and lakes for drinking water.