Mississippi River Gets a D in Water Quality Thanks to Agricultural Runoff


Via Flickr

Nicole Welle | December 24, 2020

A new report from America’s Watershed Initiative revealed a concerning decline in Mississippi River water quality over the last five years by giving its water quality a D, and it placed the blame on uncontrolled agricultural runoff from Iowa and other Midwest states.

Iowa has been one of the Mississippi River’s biggest polluters for years. The Iowa DNR’s ambient stream monitoring showed that the amount of nitrogen polluting the river has doubled over the last 20 years, and the annual load surpassed 1 billion pounds twice in the last four years. This has been disastrous for marine life in the Gulf of Mexico as the dead zone, an area of water no longer capable of supporting marine life due to high levels of nitrogen and phosphorous pollution, continues to average at 5,408 square miles, according to an article in the Gazette.

Iowa’s current Nutrient Reduction Strategy is meant to reduce the amount of nitrogen and phosphorous pollution from agricultural runoff entering the dead zone through the Mississippi River, and the state has made progress in some conservation efforts like promoting cover crops, restoring wetlands and installing bioreactors. However, these practices alone have not been enough to make up for the rapid intensification of agriculture in the state. Agricultural runoff continues to increase as farmers apply nitrogen fertilizer over the recommended rate and choose to opt out of voluntary conservation practices without penalty.

Many Iowa environmentalists have called for state government-imposed mandatory regulations to ensure that farmers adopt conservation practices and reduce harmful agricultural runoff into the Mississippi River and other waterways. This would include putting a limit on the amount of manure and commercial fertilizer farmers can apply to their fields and ensuring that water quality standards are met.

Action on a federal level could also improve water quality in the Mississippi River. President-elect Joe Biden has said that he will increase federal spending on incentives for farmers who plant cover crops and reserve their land for conservation, a plan that would improve water quality and sequester carbon from the atmosphere. Biden also nominated former Iowa Governor Tom Vilsack to lead the U.S. Department of Agriculture, and he is likely to work on improving the nation’s water resources like the Mississippi River and establish a line of federal funding for conservation efforts.

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