Mississippi SWPPP inspection requirements
- Rain trigger
- Any rain event that produces a discharge (no inch threshold)
- Post-rain deadline
- No fixed hour deadline stated — inspect after discharge-producing rain events
- Routine inspections
- At least weekly (minimum four per month)
- Permit
- Large / Small Construction General Permit (MSR10)
- Agency
- Mississippi Department of Environmental Quality (MDEQ)
How Mississippi handles construction stormwater
Construction sites in Mississippi disturbing one acre or more need coverage under the Large / Small Construction General Permit (MSR10), administered by Mississippi Department of Environmental Quality. The Large CGP (5+ acres; effective February 4, 2022 – January 31, 2027) requires weekly inspections (minimum 4/month) plus inspections after discharge-producing rain. The Small CGP (1–5 acres) expired April 30, 2024 and is administratively continued pending reissuance.
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 Mississippi?
Under the Large / Small Construction General Permit (MSR10), any rain event that produces a discharge (no inch threshold) triggers an inspection, no fixed hour deadline stated — inspect after discharge-producing rain events. Routine inspections: at least weekly (minimum four per month).
Who can perform SWPPP inspections in Mississippi?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Mississippi?
Mississippi Department of Environmental Quality (MDEQ) administers the NPDES construction stormwater program in Mississippi under the Large / Small Construction General Permit (MSR10).
What are the penalties for SWPPP violations in Mississippi?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and MDEQ 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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