There are 152 NPDES permits which authorize discharges from combined sewer overflows (CSOs) to the Great Lakes Basin. Select the state in the right-side box for the list of CSO permits in the Great Lakes Basin in that state.

There are 33 NPDES permits for CSO discharges in the Great Lakes Basin in Michigan. The table below provides information about those permittees. The Michigan Department of Environment, Great Lakes, and Energy has published an Annual Report describing the CSO discharges that occurred by these permittees in 2018, see: Combined Sewer Overflow (CSO), Sanitary Sewer Overflow (SSO), and Retention Treatment Basin (RTB) Discharge 2018 Annual Report(1112 pp, 9.8 MB, About PDF)Exit

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The Michigan Department of Environmental Quality prepares annual reports summarizing CSO, sanitary sewer overflow and retention basin discharge information. 

Appendix A of the Report to Congress: Combined Sewer Overflows into the Great Lakes Basin has information on CSOs in communities in the Great Lakes Basin during 2014.

EPA’s Enforcement and Compliance History Online (ECHO) database has additional information on NPDES discharges, including CSO discharges for some facilities.

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