MSD has been working for more than a decade to reduce combined sewer overflows (CSOs) and eliminate sanitary sewer overflows (SSOs) into our local rivers and streams. To date, we have reduced CSOs by 7.8 billion gallons annually and made significant improvements in eliminating SSOs.


MSD completed the first phase (Phase 1) of its Wet Weather Program in 2021, is working to complete the second phase (Phase 2A) by the end of 2024, and will soon be negotiating with the U.S. EPA on the next set of wet weather projects (Phase 2B).



Graphic showing accomplishments during the first phase of MSD's wet weather program




For detailed information on MSD's Wet Weather Program, including budget, schedule, performance metrics, potential project risks, etc., please view or download the reports below:



Consent Decree Quarterly Reports (select a report from the list below):



Consent Decree Annual Reports (select a report from the list below):



Other Reports and Plans (select a report from the list below):






This database is a list of active MSD capital projects in planning, design, construction, final acceptance, or closeout under our Capital Improvement Program (CIP). This database is updated monthly.


You can sort (ascending/descending) each column of the database by clicking the small triangle underneath each header.


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During Phase 1, MSD completed about 150 wet weather projects at a cost of about $961 million (in 2006 dollars) and $1.08 billion in today's dollars. The estimated cost of Phase 1 was $1.14 billion (in 2006 dollars), so this phase came in under budget. These projects, representing Consent Decree indices 1-119, ranged from sewer replacements to sewer separations and pump station eliminations to treatment plant upgrades. The largest project was the Lower Mill Creek Partial Remedy (LMCPR) which included 24 separate wet weather projects to reduce CSOs into the lower portion of the Mill Creek. The Lick Run Greenway in South Fairmount (internally listed as the Lick Run Valley Conveyance System) was the largest of these projects.






MSD reviews hundreds of monitored overflow points to confirm actual overflow occurrences at each outfall. This database includes all discharges, including CSOs, SSOs, and Non-Enumerated Overflows (NEOs), since November 2016 and all CSO discharges since 2010.


Click on a specific outfall to learn more or adjust the date range to narrow your search.


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MSD reports all discharges from CSOs in its monthly Discharge Monitoring Reports submitted to the Ohio EPA. Since November 2023, MSD has used advanced data analysis tools to measure and categorize daily overflow volumes when the sewer system is under various conditions, such as: dry weather, wet weather, and flooded conditions.


Use the data filters to find information on specific CSOs.


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Map Legend:


  • WW OF: Wet Weather overflow volume reported within 24 hours of recorded rainfall in the contributing sewershed.
  • DW OF: Dry Weather overflow volume reported with no recorded rainfall in the contributing sewershed.
  • FL OF:Flooded overflow volume reported when local creek or river level is elevated and influencing the combined sewer system.
  • AVAILABLE (%): Percentage of time that remote monitoring equipment was in service and reporting.