Polluted Chicago Water Travels Over 1,000 Miles and Wreaks Havoc in the Gulf

An algae bloom in the Gulf of Mexico has resulted in an oxygen-starved area the size of Massachusetts. Part of the problem is sewage runoff flowing south from Chicago.

1 minute read

June 22, 2019, 7:00 AM PDT

By Camille Fink


Mississippi River Missouri

Dan Brekke / Flickr

Tony Briscoe reports that a giant algae bloom in the Gulf of Mexico is being fed by agricultural and urban runoff from the Midwest flowing into the Mississippi River. "While the agricultural runoff from farms — exempted under the Clean Water Act — is the main driver of the Gulf dead zone, Chicago’s sewage is the largest single source of phosphorus pollution."

Heavy rains are flushing more nitrogen from fertilizer and phosphorous from sewage into the river, and the resulting dead zone in the Gulf of Mexico is killing off fish and shrimp populations. But dead zones are also a problem in the Great Lakes, with large algae blooms in Lake Michigan and Lake Erie, reports Briscoe.

Environmental groups want to see less water pollution coming out of Chicago, and they are also working to curb agricultural runoff. "In collaboration with the agricultural industry, the [Natural Resources Defense Council] pushed to incentivize the use of cover crops, plants like cereal rye that soak up water and nutrients during the off-season," writes Briscoe.

Friday, June 14, 2019 in Chicago Tribune

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

Wastewater pouring out from a pipe.

Alabama: Trump Terminates Settlements for Black Communities Harmed By Raw Sewage

Trump deemed the landmark civil rights agreement “illegal DEI and environmental justice policy.”

April 13, 2025 - Inside Climate News

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

April 16, 2025 - Diana Ionescu

Blue and white Seattle Link light rail train exiting concrete Downtown Bellevue Tunnel in Bellevue, WA.

Why Should We Subsidize Public Transportation?

Many public transit agencies face financial stress due to rising costs, declining fare revenue, and declining subsidies. Transit advocates must provide a strong business case for increasing public transit funding.

April 7, 2025 - Todd Litman

Two people on bikes in red painted bike lane with bus in traffic lane next to them.

Understanding Road Diets

An explainer from Momentum highlights the advantages of reducing vehicle lanes in favor of more bike, transit, and pedestrian infrastructure.

April 17 - Momentum Magazine

Aerial view of large warehouses across from development of suburban single-family homes in Jurupa, California with desert mountains in background.

New California Law Regulates Warehouse Pollution

A new law tightens building and emissions regulations for large distribution warehouses to mitigate air pollution and traffic in surrounding communities.

April 17 - Black Voice News

Purple Phoenix light rail train connected to overhead wires at sunset.

Phoenix Announces Opening Date for Light Rail Extension

The South Central extension will connect South Phoenix to downtown and other major hubs starting on June 7.

April 17 - Arizona Republic