Does anyone regulate Combined Sewer Overflows?
Yes. Combined Sewer Overflows are regulated and permitted through the United States Environmental Protection Agency in cooperation with the Illinois Environmental Protection Agency.
- Since its creation via the 1972 Clean Water Act, the U.S. Environmental Protection Agency (U.S. EPA) has progressively increased the regulation of pollutants discharged into the nation’s water ways.
- In 1994, the U.S. EPA published the CSO Control Policy.
- In 1997, an amendment to the U.S. EPA CSO Control Policy was adopted that required all combined sewer communities within the nation to develop and implement a Long Term Control Plan (LTCP).

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1. What is a Combined Sewer System?
2. What is a Combined Sewer Overflow (CSO)?
3. How many cities have Combined Sewer Overflows (CSO)?
4. Does Aurora have Combined Sewer Overflows (CSOs)?
5. What challenges do Combined Sewer Overflow (CSO) communities face?
6. What has Aurora done to improve the Combined Sewer System (CSO) and prevent sewer backups and overflows?
7. Does anyone regulate Combined Sewer Overflows?