MS4 (Municipal Separate Storm System Stormwater) Management Program

Stormwater Management Program

The mission of Boone County's stormwater management program is to establish stormwater management requirements and controls to enhance and protect water quality, reduce stormwater pollutant runoff, and protect and safeguard the general health, safety, and welfare of the public residing in watersheds within Boone County.

Boone County is jointly permitted with the City of Columbia and University of Missouri in accordance with the Stormwater Phase II Final Rule requirements specified in section 4.1.4 of the site-specific permit MO-0136557 for discharges from small regulated Municipal Separate Storm Sewer Systems (MS4s), as well as per state regulation 10 CSR 20-6.200 and federal regulations 40 CRFR Parts 9 and 122. In order to fulfill its permit requirements, Boone County has implemented six (6) Minimum Control Measures (MCM), which are expected to help significantly reduce pollutants into receiving waterbodies.

Minimum Control Measures (MCM)

The MS4 program has six elements termed "minimum control measures," which, when implemented, should result in a significant reduction in pollutants discharged into receiving waters.

The six minimum control measures are:

1. Public Education and Outreach

   Educate targeted audiences and the general public about the impacts of stormwater discharges on waterbodies and steps the public can take to reduce pollutants in stormwater runoff.

2. Public Involvement and Participation

   Provide opportunities for public participation in the development, implementation, and review of the permittee’s Stormwater Management Program.

3. Illicit Discharge Detection and Elimination

   Develop, implement and enforce a plan to detect and eliminate non-stormwater discharges, including illegal dumping, into the stormwater system.

4. Construction Site Runoff Control

   Reduce pollutants in any stormwater runoff to the MS4 from construction activities that result in a land disturbance of grater than or equal to one acre.

5. Post-Construction Runoff Control

   Address the quality of stormwater runoff from new development and redevelopment projects that disturb greater than or equal to one acre.

6. Pollution Prevention/Good Housekeeping

   Develop and implement a program that reduces or prevents pollutant runoff from municipal operations.

Program Resources:

• 2021-2025 Show-Me Stormwater Management Plan
• MS4 Permit
• 2022 Annual Report Show-Me Stormwater
• Missouri Department of Natural Resources MS4
• EPA MS4

Co-permittee Websites:

• City of Columbia Stormwater
• MU EHS Stormwater