Montana SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- MTR100000 Construction General Permit
- Agency
- Montana Department of Environmental Quality (MT DEQ)
Verify against your permit. These values reflect the most common reading of Montana's program; permits change and projects vary. The official permit text from MT DEQ controls.
How Montana handles construction stormwater
Construction sites in Montana disturbing one acre or more need coverage under the MTR100000 Construction General Permit, administered by Montana Department of Environmental Quality.
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 Montana?
Under the MTR100000 Construction General Permit, 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 Montana?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Montana?
Montana Department of Environmental Quality (MT DEQ) administers the NPDES construction stormwater program in Montana under the MTR100000 Construction General Permit.
What are the penalties for SWPPP violations in Montana?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and MT DEQ 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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