Phase 2 Small Municipal Separate Storm Sewer Systems

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 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