South Dakota SWPPP inspection requirements
- Rain trigger
- 0.25″ storm event
- Post-rain deadline
- Within 24 hours (weekends count)
- Routine inspections
- Every 7 or 14 days
- Permit
- SDR100000 Construction General Permit (2023)
- Agency
- South Dakota Department of Agriculture and Natural Resources (DANR)
How South Dakota handles construction stormwater
Construction sites in South Dakota disturbing one acre or more need coverage under the SDR100000 Construction General Permit (2023), administered by South Dakota Department of Agriculture and Natural Resources. SDR100000 (effective November 1, 2023 – October 31, 2028) allows every 7 days with no storm trigger, or every 14 days plus within 24 hours of precipitation over 0.25″ or runoff-generating snowmelt (calendar-based — no business-day exception). On-site rain gauge required; monthly allowed for winter-stabilized sites until March 1. NOIs go through EPA's CDX portal.
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 South Dakota?
Under the SDR100000 Construction General Permit (2023), a storm event of 0.25 inches or more triggers a post-storm inspection, within 24 hours (weekends count). Routine inspections: every 7 or 14 days.
Who can perform SWPPP inspections in South Dakota?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in South Dakota?
South Dakota Department of Agriculture and Natural Resources (DANR) administers the NPDES construction stormwater program in South Dakota under the SDR100000 Construction General Permit (2023).
What are the penalties for SWPPP violations in South Dakota?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and DANR 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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