August 29th, 2025
By Kory Bonnell, Director of Environmental Compliance at WSB
The countdown to the release of the updated MS4 Permit has begun. The current MS4 Permit for Minnesota communities will expire on November 15th, 2025. As a new permit expiration date approaches, it’s a good idea for communities to take a few minutes to reflect on MS4 progress made to date.
Here’s what communities can do now:
- Review and update storm sewer system maps. Take a close look at storm sewer, pond, outfall, and structural stormwater BMP locations and ownership information and complete updates, as needed.
- Dust off ordinances, written procedures, enforcement response procedures, form templates, and save them in a convenient location – they’ll come in handy for the Part II application.
- Complete a mock audit. Understanding the current state of the program compared to the existing requirements will better prepare communities for Part II of the application.
- Organize files and recordkeeping mechanisms. Consider creating a shared drive so everyone can help track and contribute to MS4 activities. If the current set-up isn’t working, now is the time to find a system that works for easy tracking for the next permit cycle.
- Continue the routine upkeep of your MS4 program to keep operations running smoothly, including staff training, erosion control inspections and enforcement, public education efforts, annual meetings, etc. The permit may be approaching expiration, but implementation of current programs and management of stormwater conveyance systems must main.
WSB can help manage MS4 programs at every stage. With over a decade of experience supporting communities throughout Minnesota, the WSB team brings valuable expertise to MS4 management. Services include updating system maps, performing audits, and assisting with record keeping and overall program management. By addressing these tasks proactively, communities will be well-prepared to handle whatever the new MS4 Permit may require.
