Grading, Drainage & Erosion Permits


  • To control the quantity and quality of storm water runoff
  • Provide minimum standards for site grading and control of storm water

Permits Required

For any new buildings where the grade of the lot is altered more than three feet. The exception is for new single family residences where the original slope is less than 5%. These permits are governed by Missoula Municipal Code 13.27 (PDF).

Expiration Date

Permits expire if work is not started within 180 days of issuance.


Contact Development Services at 406-552-6630.