Oregon SWPPP inspection requirements
- Rain trigger
- 0.25″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- 1200-C Construction Stormwater General Permit (2025)
- Agency
- Oregon Department of Environmental Quality (OR DEQ)
How Oregon handles construction stormwater
Construction sites in Oregon disturbing one acre or more need coverage under the 1200-C Construction Stormwater General Permit (2025), administered by Oregon Department of Environmental Quality. The reissued 1200-C is effective December 15, 2025 – December 14, 2030. Registrants lock one option into their ESCP: every 7 days with no storm trigger, or every 14 days plus within 24 hours of a 0.25″ storm (and snowmelt). A window falling outside working hours rolls to the next business day.
Inspector qualifications
The Designated Erosion and Sediment Control Inspector must hold a recognized certification: CESSWI, CPESC, CPSWQ, CISEC, Washington CESCL, RVSS ESCI, or be an Oregon PE, RLA, or CEG.
Official sources
Common questions
What triggers a SWPPP inspection in Oregon?
Under the 1200-C Construction Stormwater General Permit (2025), a storm event of 0.25 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 7 or 14 days.
Who can perform SWPPP inspections in Oregon?
The Designated Erosion and Sediment Control Inspector must hold a recognized certification: CESSWI, CPESC, CPSWQ, CISEC, Washington CESCL, RVSS ESCI, or be an Oregon PE, RLA, or CEG.
Who administers the construction stormwater program in Oregon?
Oregon Department of Environmental Quality (OR DEQ) administers the NPDES construction stormwater program in Oregon under the 1200-C Construction Stormwater General Permit (2025).
What are the penalties for SWPPP violations in Oregon?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and OR 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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