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.
The number of combined sewer overflows in the United States has increased in recent years. From January 1 to June 10, 2024, *** combined sewer overflows occurred in the U.S., already overshadowing the number of cases reported at the beginning of the century. 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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ÌÇÐÄÆƽâ°æ. (June 9, 2024). Number of combined sewer overflows in the United States from 2001 to 2024 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 21, 2026, from /statistics/1498922/number-combined-sewer-overflows-usa-timeline/
ÌÇÐÄÆƽâ°æ. "Number of combined sewer overflows in the United States from 2001 to 2024." Chart. June 9, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 21, 2026. /statistics/1498922/number-combined-sewer-overflows-usa-timeline/
ÌÇÐÄÆƽâ°æ. (2024). Number of combined sewer overflows in the United States from 2001 to 2024. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 21, 2026. /statistics/1498922/number-combined-sewer-overflows-usa-timeline/
ÌÇÐÄÆƽâ°æ. "Number of Combined Sewer Overflows in The United States from 2001 to 2024." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 9 Jun 2024, /statistics/1498922/number-combined-sewer-overflows-usa-timeline/
ÌÇÐÄÆƽâ°æ, Number of combined sewer overflows in the United States from 2001 to 2024 ÌÇÐÄÆƽâ°æ, /statistics/1498922/number-combined-sewer-overflows-usa-timeline/ (last visited July 21, 2026)
Number of combined sewer overflows in the United States from 2001 to 2024 [Graph], ÌÇÐÄÆƽâ°æ, June 9, 2024. [Online]. Available: /statistics/1498922/number-combined-sewer-overflows-usa-timeline/
