File
Permit Number
MO-R040000
Effective Date
Expiration Date
Description
SIC/NAICS #924110
Discharges from regulated Phase 2 Small Municipal Separate Storm Sewer Systems.
For more information, visit Municipal Separate Storm Sewer Systems (MS4).
*The department is in the process of renewing this permit. If this permit is issued to your facility, you must apply for renewal of your permit a minimum of 30 days before it expires, so the department can authorize your facility to continue operating in Missouri.
- Phase 2 Small Municipal Separate Storm Sewer Systems Draft Missouri State Operating Master General Permit Public Comment Period, Jan. 23, 2026 to Feb. 23, 2026
- Phase 2 Small Municipal Separate Storm Sewer Systems Master General Permit Reissuance Public Meeting, June 4, 2025
- Phase 2 Small Municipal Separate Storm Sewer Systems Master General Permit Reissuance Public Meeting, July 2, 2025