Illinois SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- ILR10 Construction General Permit
- Agency
- Illinois Environmental Protection Agency (IEPA)
Verify against your permit. These values reflect the most common reading of Illinois's program; permits change and projects vary. The official permit text from IEPA controls.
How Illinois handles construction stormwater
Construction sites in Illinois disturbing one acre or more need coverage under the ILR10 Construction General Permit, administered by Illinois Environmental Protection Agency.
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 Illinois?
Under the ILR10 Construction General Permit, a storm event of 0.5 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 Illinois?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Illinois?
Illinois Environmental Protection Agency (IEPA) administers the NPDES construction stormwater program in Illinois under the ILR10 Construction General Permit.
What are the penalties for SWPPP violations in Illinois?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and IEPA 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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