drainage districts

An estimated 526,000 tons of nitrates were "exported" into Iowa rivers and streams in 2016, eventually flowing down the Mississippi River to the Gulf of Mexico and adding to the so-called "dead zone" where fish cannot survive.

According to the Annual Progress Report of the Iowa Nutrient Reduction Strategy (NRS) group released last week (12/12), more than 29 pounds of nitrogen from each of Iowa's 35.75 million acres of crop land ended up in state waterways.