Lowell applies the Massachusetts DEP 10-dB-above-ambient standard for objective measurement and uses a plainly-audible test for subjective enforcement.
Lowell does not publish a single fixed decibel number in its municipal code; instead, enforcement uses two parallel standards. For subjective enforcement, noise is a violation if it is plainly audible at 50 feet during the day or at the property line at night. For objective measurement (used against industrial sources, HVAC, or persistent complaints), the Massachusetts DEP Policy 90-001 applies: noise must not exceed 10 dB(A) above the L90 ambient sound level at any sensitive receptor, and no pure tones may be generated. Lowell Police and Code Enforcement carry Type 2 sound level meters for field measurement. Typical daytime ambient in Lowell neighborhoods ranges from 45 to 55 dB(A); near highways and the Lowell Connector ambient is 60+ dB(A). Violations can be cited at either standard.
Contact your local code enforcement office for specific penalty information.
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