Illinois SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours of the end of the storm, or by the end of the following business or work day
- Routine inspections
- Every 7 days
- Permit
- ILR10 Construction General Permit
- Agency
- Illinois Environmental Protection Agency (IEPA)
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. The current ILR10 is effective September 22, 2023 – August 31, 2028. Illinois requires every-7-day inspections plus the 0.5″ storm trigger — there is no 14-day option. Flooded areas: within 72 hours of becoming accessible; monthly during frozen-conditions shutdown.
Inspector qualifications
Qualified personnel — e.g., a licensed PE, CPESC, CESSWI, CSI, or another person knowledgeable in erosion and sediment control.
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, within 24 hours of the end of the storm, or by the end of the following business or work day. Routine inspections: every 7 days.
Who can perform SWPPP inspections in Illinois?
Qualified personnel — e.g., a licensed PE, CPESC, CESSWI, CSI, or another person knowledgeable in erosion and sediment control.
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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