Missouri SWPPP inspection requirements
- Rain trigger
- 0.25″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- MORA General Permit (Land Disturbance)
- Agency
- Missouri Department of Natural Resources (MoDNR)
How Missouri handles construction stormwater
Construction sites in Missouri disturbing one acre or more need coverage under the MORA General Permit (Land Disturbance), administered by Missouri Department of Natural Resources. Two options: inspect every 7 days plus within 48 hours of a 2-year/24-hour storm (~0.36″), or every 14 days plus within 24 hours of any 0.25″ storm. Non-workday storms extend the window to 72 hours under Option A.
Inspector qualifications
Qualified personnel designated by the operator.
Official sources
Common questions
What triggers a SWPPP inspection in Missouri?
Under the MORA General Permit (Land Disturbance), a storm event of 0.25 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 Missouri?
Qualified personnel designated by the operator.
Who administers the construction stormwater program in Missouri?
Missouri Department of Natural Resources (MoDNR) administers the NPDES construction stormwater program in Missouri under the MORA General Permit (Land Disturbance).
What are the penalties for SWPPP violations in Missouri?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and MoDNR 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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