CSO and SSO Discharge Information

 About CSO and SSO Discharges

Learn about what causes Combined Sewer Overflows and Sanitary Sewer Overflows.

 Locate a CSO Facility

Search our database to find out which facilities may discharge wastewater under a CSO Permit.

 Search for Discharge Information

Search our database for information about specific discharges. A search may be performed by either the receiving water, county of discharge, or by the responsible entity.

 Display Info about Recent Discharges

Facilities are required to notify the MDEQ within 24 hours when a CSO or SSO discharge begins. After the discharge ends, the facility must submit a complete report including the locations and volume of the discharge. Use this link to locate information about events where MDEQ has not yet received a complete report.

 Download SSO Reporting Form

Use this link to download the Microsoft Word SSO Reporting form. This form should be used by municipalities or legal entities responsible for reporting a sanitary sewer overflow.