The Municipal Separate Storm Sewer System (MS4) program was created to help maintain and improve the quality of waterways by reducing the pollutant discharges that flow into them with stormwater runoff.
The Louisville MS4 program is regulated under the Kentucky Pollutant Discharge Elimination System (KPDES) permit issued by the Kentucky Division of Water (DOW) to MSD and co-permittees. MSD is the lead administrative agency, and the co-permittees include:
Explore the links below to learn more about the activities and programs associated with the MS4 permit.
Public Education & Outreach
Development & Stormwater Permitting
