Arizona SWPPP inspection requirements
- Rain trigger
- 0.25″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- AZPDES Construction General Permit (AZG2025-001)
- Agency
- Arizona Department of Environmental Quality (ADEQ)
Verify against your permit. These values reflect the most common reading of Arizona's program; permits change and projects vary. The official permit text from ADEQ controls.
How Arizona handles construction stormwater
Construction sites in Arizona disturbing one acre or more need coverage under the AZPDES Construction General Permit (AZG2025-001), administered by Arizona Department of Environmental Quality. The current CGP (AZG2025-001) is effective August 29, 2025 – August 28, 2030, replacing AZG2020-001. Inspect every 7 days, or every 14 days plus within 24 hours of a 0.25″ storm; a weekend storm rolls to the next work day. Sites within a quarter mile of impaired waters or Outstanding Arizona Waters follow an escalated schedule.
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 Arizona?
Under the AZPDES Construction General Permit (AZG2025-001), 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 Arizona?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Arizona?
Arizona Department of Environmental Quality (ADEQ) administers the NPDES construction stormwater program in Arizona under the AZPDES Construction General Permit (AZG2025-001).
What are the penalties for SWPPP violations in Arizona?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and ADEQ 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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