Where are the cities with CSO problems?
Combined sewer systems serve roughly 772 communities with about 40 million people. Most communities with CSOs are located in the Northeast and Great Lakes Regions, particularly in Pennsylvania, Indiana, Ohio, Illinois, Michigan, New York, West Virginia, and Maine. Although large cities like New York, Philadelphia, and Atlanta have combined sewer systems, most communities with CSO problems have fewer than 10,000 people.
