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Explainer: What is a sanitary sewer overflow?

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. When they occur, they must be reported to the Illinois EPA. SSOs can be caused by blockages, line breaks, sewer defects, power failures, improper sewe…
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illinoisanswers.org broke the news in on Tuesday, June 17, 2025.
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