Maryland SWPPP inspection requirements
- Rain trigger
- 0.5″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- 20-CP General Permit for Construction Activity
- Agency
- Maryland Department of the Environment (MDE)
Verify against your permit. These values reflect the most common reading of Maryland's program; permits change and projects vary. The official permit text from MDE controls.
How Maryland handles construction stormwater
Construction sites in Maryland disturbing one acre or more need coverage under the 20-CP General Permit for Construction Activity, administered by Maryland Department of the Environment.
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 Maryland?
Under the 20-CP General Permit for Construction Activity, 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 Maryland?
A qualified person designated by the operator. Check the current state permit for certification requirements.
Who administers the construction stormwater program in Maryland?
Maryland Department of the Environment (MDE) administers the NPDES construction stormwater program in Maryland under the 20-CP General Permit for Construction Activity.
What are the penalties for SWPPP violations in Maryland?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and MDE 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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