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