Minnesota SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours (weekends count)
- Routine inspections
- Every 7 days
- Permit
- Construction Stormwater General Permit (MNR100001)
- Agency
- Minnesota Pollution Control Agency (MPCA)
How Minnesota handles construction stormwater
Construction sites in Minnesota disturbing one acre or more need coverage under the Construction Stormwater General Permit (MNR100001), administered by Minnesota Pollution Control Agency. MNR100001 (effective August 1, 2023 – July 31, 2028) requires inspections every 7 days during active construction and within 24 hours after rainfall greater than 0.5″ in 24 hours — including weekends; there is no 14-day option. Records stay with the SWPPP on site.
Inspector qualifications
Trained personnel (training commensurate with duties, refreshed every 3 years). The University of Minnesota erosion-control certification is the commonly used standard — mandatory on MnDOT projects.
Official sources
Common questions
What triggers a SWPPP inspection in Minnesota?
Under the Construction Stormwater General Permit (MNR100001), a storm event of 0.5 inches or more triggers a post-storm inspection, within 24 hours (weekends count). Routine inspections: every 7 days.
Who can perform SWPPP inspections in Minnesota?
Trained personnel (training commensurate with duties, refreshed every 3 years). The University of Minnesota erosion-control certification is the commonly used standard — mandatory on MnDOT projects.
Who administers the construction stormwater program in Minnesota?
Minnesota Pollution Control Agency (MPCA) administers the NPDES construction stormwater program in Minnesota under the Construction Stormwater General Permit (MNR100001).
What are the penalties for SWPPP violations in Minnesota?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and MPCA can issue administrative orders and state penalties on top. Missing rain-triggered inspections is among the most commonly cited violations in stormwater audits.
Free templates & guides
Other states