Massachusetts SWPPP inspection requirements
- Rain trigger
- 0.25″ storm event
- Post-rain deadline
- Within 24 hours
- Routine inspections
- Every 7 or 14 days
- Permit
- 2022 Construction General Permit (CGP), as modified 2025
- Agency
- U.S. EPA (federal program)
How Massachusetts handles construction stormwater
Massachusetts is one of the few jurisdictions where the U.S. EPA runs the NPDES construction stormwater program directly. Construction sites disturbing one acre or more operate under the federal Construction General Permit (CGP). Massachusetts has not been delegated NPDES construction stormwater authority, so EPA's federal CGP applies directly — with Massachusetts-specific 401 conditions that are stricter than the base permit: sites on the 14-day schedule must also inspect within 24 hours of 0.25″ storms, and all sites must inspect weekly during April–June.
Inspector qualifications
A "qualified person" who has completed EPA's construction inspection training course and exam (or an equivalent training/certification program) per Part 6.3 of the CGP — required for projects covered on or after February 17, 2023.
Official sources
Common questions
What triggers a SWPPP inspection in Massachusetts?
Under the 2022 Construction General Permit (CGP), as modified 2025, a storm event of 0.25 inches or more triggers a post-storm inspection, within 24 hours (non-work days typically extend to the next work day; check your permit). Routine inspections: every 7 or 14 days.
Who can perform SWPPP inspections in Massachusetts?
A "qualified person" who has completed EPA's construction inspection training course and exam (or an equivalent training/certification program) per Part 6.3 of the CGP — required for projects covered on or after February 17, 2023.
Who administers the construction stormwater program in Massachusetts?
Massachusetts is not delegated NPDES construction stormwater authority, so the U.S. EPA administers the program directly under the federal Construction General Permit.
What are the penalties for SWPPP violations in Massachusetts?
Federal Clean Water Act civil penalties can reach $68,445 per day per violation, and EPA can issue administrative orders and state penalties on top. Missing rain-triggered inspections is among the most commonly cited violations in stormwater audits.
Free templates & guides
Other states