Combined Sewer Overflows
Demographics

Combined sewer system are remnants of the country's early infrastructure and so are typically found in older communities. Combined sewer systems serve roughly 772 communities containing about 40 million people. Most communities with combined sewer systems (and therefore with CSOs) are located in the Northeast and Great Lakes regions, and the Pacific Northwest (see map below).

The map below provides a rough illustration of the prevalence of combined sewer systems in the U.S.:

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Last updated on October 15, 2008 1:55 PM
URL:http://cfpub.epa.gov/npdes/cso/demo.cfm