Carterville reported 40 sanitary sewer overflows in the past decade. City officials have known for years that a new wastewater treatment plant would resolve the issue. They promised it would be operational by last year. But construction hasn’t started yet. Meanwhile, residents deal with flooding and backed up basements.
Wasted Waters
Wasted Waters: How Southern Illinois is Coping with Decades of Sewage Flooding… and Why it Still Isn’t Solved.
Five dozen communities in Southern Illinois account for a third of the reported sanitary sewer overflows in the state in the last decade. But with low revenues, population declines, and bureaucratic delays, solutions are hard to come by. Meanwhile, residents face property damage flooded yards and basements and governments that still haven’t fixed the problem.
Explainer: What is a sanitary sewer overflow?
Sanitary sewer overflows, SSOs, are a release of untreated or partially treated waste from a city sewer. Sanitary sewer overflows are illegal. But when normal systems become overloaded through heavy rain or a larger load from an increasing population, SSOs occur.

