Michigan SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- Permit-by-Rule / Part 91 Soil Erosion Program
- Agency
- Michigan Department of Environment, Great Lakes, and Energy (EGLE)
Verify against your permit. These values reflect the most common reading of Michigan's program; permits change and projects vary. The official permit text from EGLE controls.
How Michigan handles construction stormwater
Construction sites in Michigan disturbing one acre or more need coverage under the Permit-by-Rule / Part 91 Soil Erosion Program, administered by Michigan Department of Environment, Great Lakes, and Energy. Michigan runs construction stormwater through its soil erosion (Part 91) program with county enforcement — requirements vary by county agency.
Inspector qualifications
A qualified person designated by the operator. Check the current state permit for certification requirements.
Official sources
Common questions
What triggers a SWPPP inspection in Michigan?
Under the Permit-by-Rule / Part 91 Soil Erosion Program, a storm event of 0.5 inches or more triggers a post-storm inspection, generally due within 24 hours (non-work days typically extend to the next work day; check your permit). Routine inspections run every 7 or 14 days.
Who can perform SWPPP inspections in Michigan?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Michigan?
Michigan Department of Environment, Great Lakes, and Energy (EGLE) administers the NPDES construction stormwater program in Michigan under the Permit-by-Rule / Part 91 Soil Erosion Program.
What are the penalties for SWPPP violations in Michigan?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and EGLE can issue administrative orders and state penalties on top. Missing rain-triggered inspections is among the most commonly cited violations in stormwater audits.
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