Middlesex County has no operational county government - it was abolished July 11, 1997 under M.G.L. c. 34B - so there is no countywide noise ordinance. Massachusetts has no statewide decibel limit either; quiet hours are set by each city/town under home rule. The state baseline is 310 CMR 7.10 (MassDEP Noise Pollution Policy), which prohibits any source from causing sound that exceeds the ambient (background) level by more than 10 dB(A) at the property line of the source, or that produces a pure tone condition. In Middlesex County's largest cities, Cambridge Code Ch. 8.16 sets quiet hours from 10:00 p.m. to 7:00 a.m., Lowell Code Ch. 215 prohibits unreasonable noise from 11:00 p.m. to 7:00 a.m., and Newton Code Ch. 20 sets the period 10:00 p.m. to 7:00 a.m. weekdays.
Massachusetts is a home rule state under Article 89 of the state constitution, so cities and towns - not counties - regulate noise. Middlesex County government was abolished by St. 1997 c. 48, codified at M.G.L. c. 34B; the abolition took effect July 11, 1997 with assets transferred to the Commonwealth. There is no Middlesex County Commission, no Middlesex County code, and no countywide noise authority. The state-level regulation is 310 CMR 7.10, the MassDEP Noise Pollution Policy: it prohibits any source from causing sound that exceeds the ambient (background) level by more than 10 dB(A) measured at the property line of the source, or that produces a pure tone condition. MassDEP guidance also identifies a violation when sound is plainly audible at 50 feet or causes a public nuisance. Local quiet hours in Middlesex County municipalities vary: Cambridge (Code of Ordinances Ch. 8.16, Noise Control) prohibits unreasonable noise that disturbs sleep between 10 p.m. and 7 a.m. and limits construction to 7 a.m. to 6 p.m. weekdays and 8 a.m. to 6 p.m. Saturdays, with no construction Sundays/holidays. Lowell (Code Ch. 215, Noise) bars unreasonable noise 11 p.m. to 7 a.m. and limits domestic power equipment to daytime hours. Newton (Code Ch. 20, Noise Control) sets the quiet period 10 p.m. to 7 a.m. on weekdays and 10 p.m. to 8 a.m. on weekends and follows the 310 CMR 7.10 ambient-plus-10 dB standard. Somerville, Waltham, Medford, Malden, Framingham, Arlington, and the 54 towns in the county each have their own bylaws under M.G.L. c. 40 §21 (general bylaws) and c. 43B (home rule procedures). Enforcement is by each municipality's police department; MassDEP investigates persistent commercial/industrial noise complaints under 310 CMR 7.10.
Penalties depend entirely on the local ordinance. Cambridge noise violations are non-criminal civil infractions with fines starting at $50 for a first offense and $300 for repeat offenses; Lowell and Newton follow similar tiered fine schedules under M.G.L. c. 40 §21D (non-criminal disposition). Violations of 310 CMR 7.10 enforced by MassDEP can carry administrative penalties up to $25,000 per day per violation under M.G.L. c. 21A §16. Persistent violations may be abated as public nuisances under M.G.L. c. 139.
See how Middlesex County's quiet hours rules stack up against other locations.
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