State law file · verified June 2026
Massachusetts idling law: the 5 minutes rule
By Mario Bailey
No person may cause or allow “unnecessary operation” of a stopped vehicle’s engine for a foreseeable period over 5 minutes (MGL c.90 §16A, mirrored in regulation at 310 CMR 7.11). A companion statute, c.90 §16B, further restricts idling on school grounds.
Exceptions that actually matter
- Engine operation needed during repair
- Power for delivery/accessory equipment (e.g. refrigeration, lifts)
- Other engine operation the statute treats as necessary
Penalties
The statute sets a $100 fine for a first offense and up to $500 for each subsequent offense.
Who enforces it, and how to report
MassDEP, local boards of health, and police can enforce; school-zone idling draws particular attention under §16B.
Report persistent idling to your local board of health or police department, or to MassDEP; school-ground idling can be raised with the district and MassDEP.
Can you get paid for reporting in Massachusetts?
No. Massachusetts has no citizen reward, complaints are civic, not paid. The only major program that pays complainants is New York City's idling bounty, where citizens keep 25% of collected fines and our enforcement data shows what that produces: hundreds of thousands of cases and an estimated eight-figure sum paid to filers. If a paid program launches in Massachusetts, this page will say so.
Frequently asked questions
Is idling illegal in Massachusetts?
Yes, over 5 minutes of unnecessary engine operation while stopped violates MGL c.90 §16A, with fines of $100 for a first offense and up to $500 after that. Idling on school grounds is further restricted by §16B.
Does Massachusetts pay you to report idling?
No. Reports go to local boards of health, police, or MassDEP with no reward share. Only NYC currently pays complainants (25% of collected fines).
Sources
This summary was checked against the following official sources on the date shown above. Laws change, verify before relying on specifics.
- MGL c.90 §16A, statute text (malegislature.gov)
- MassDEP, Massachusetts Anti-Idling Law FAQ (PDF)
- Mass.gov, “Start your engine, but don’t idle too long”
Other state law files
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General legal information, not legal advice. Statutes and penalty schedules summarized from the sources above as of June 2026.