Hawaii SWPPP inspection requirements
- Rain trigger
- 0.25″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- NPDES General Permit, HAR 11-55 Appendix C (2024)
- Agency
- Hawaii Department of Health, Clean Water Branch (DOH)
How Hawaii handles construction stormwater
Construction sites in Hawaii disturbing one acre or more need coverage under the NPDES General Permit, HAR 11-55 Appendix C (2024), administered by Hawaii Department of Health, Clean Water Branch. The current Appendix C permit is effective January 29, 2024 – January 28, 2029. Inspect every 7 days, or every 14 days plus within 24 hours of a 0.25″ storm; sites discharging to impaired waters inspect every 7 days AND after 0.25″ storms. Inspection reports are due within 48 hours, signed by the certifying person.
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 Hawaii?
Under the NPDES General Permit, HAR 11-55 Appendix C (2024), 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 Hawaii?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Hawaii?
Hawaii Department of Health, Clean Water Branch (DOH) administers the NPDES construction stormwater program in Hawaii under the NPDES General Permit, HAR 11-55 Appendix C (2024).
What are the penalties for SWPPP violations in Hawaii?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and DOH 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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