Oklahoma SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 14 days (every 7 for sites discharging to impaired or sensitive waters)
- Permit
- OKR10 Construction General Permit
- Agency
- Oklahoma Department of Environmental Quality (OK DEQ)
How Oklahoma handles construction stormwater
Construction sites in Oklahoma disturbing one acre or more need coverage under the OKR10 Construction General Permit, administered by Oklahoma Department of Environmental Quality. OKR10 (effective October 18, 2022 – October 17, 2027) requires the post-storm inspection within 24 hours of the end of a 0.5″ storm (snowmelt discharges too); if the window falls outside working hours, by the end of the next business day. Inspection reports within 24 hours; corrective actions within 7 days.
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 Oklahoma?
Under the OKR10 Construction General Permit, a storm event of 0.5 inches or more triggers a post-storm inspection, within 24 hours (non-work days typically extend to the next work day; check your permit). Routine inspections: every 14 days (every 7 for sites discharging to impaired or sensitive waters).
Who can perform SWPPP inspections in Oklahoma?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Oklahoma?
Oklahoma Department of Environmental Quality (OK DEQ) administers the NPDES construction stormwater program in Oklahoma under the OKR10 Construction General Permit.
What are the penalties for SWPPP violations in Oklahoma?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and OK 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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