MS4 – Small Municipal Separate Storm Sewer System
The Mississippi Environmental Quality Permit Board is proposing to reissue the Small Municipal Separate Storm Sewer System (MS4) general permit. This permit covers the State of Mississippi and authorizes stormwater discharges and allowable non-stormwater discharges entering small MS4s. If reissued, this general permit would be active for a five-year period. This general permit will replace the previous MS4 general permit that expired on February 28, 2021. The public notice, the draft general permit, and the fact sheet can be found using the following links:
2026 MS4 General Permit Public Notice
2026 MS4 Draft General Permit for Public Notice
2026 MS4 General Permit Fact Sheet
2026 MS4 General Permit - Summary of Changes
The thirty (30) day public notice starts April 15, 2026. See the Public Notice for further instructions on providing electronic comments. Written comments should be submitted to the following address no later than the end of the thirty (30) day public notice:
Chief, Environmental Permits Division
Mississippi Department of Environmental Quality
Office of Pollution Control
P.O. Box 2261
Jackson, Mississippi 39225
