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Number of combined sewer overflows in the United States from 1985 to 2024, by state

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Sources

Release date

June 2024

Region

North America, United States

Survey time period

1985 to 2024

Special properties

As of June 10, 2024

Supplementary notes

Only approximately 700 communities in the U.S. have combined sewer systems. Such communities are mostly located in the northeast and around the Great Lakes.

ÌÇÐÄÆƽâ°æ calculated the figures based on the data available on the EPA website.

Citation formats

Number of sewer overflows in the U.S. 1985-2024, by state

Published by ÌÇÐÄÆƽâ°æ Research Department, Oct 17, 2024

From 1985 to 2024, at least overflows were reported in combined sewer systems in the United States. During this period, Pennsylvania was the state with the highest number of overflows with almost events. A combined sewer system collects rainwater, and domestic and industrial wastewater into one pipe, to later be transported to a treatment plant. When the capacity of these systems gets exceeded, untreated runoff flows to nearby waterbodies. In the U.S. combined sewers are mostly located in the Northeast. 

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