Gaithersburg limits industrial noise under Montgomery County Code Chapter 31B with specific decibel standards for industrial and commercial zones. The I-270 biotech corridor and research facilities must comply with noise limits at the boundary of adjacent residential zones.
Industrial noise in Gaithersburg is regulated under Montgomery County Code Chapter 31B, which establishes maximum permissible sound levels based on receiving land use. Industrial zones are permitted higher daytime sound levels — generally 70-75 dBA — but must not exceed 55 dBA at the boundary of any adjacent residential zone during nighttime hours. The I-270 corridor through Gaithersburg hosts major biotech and research facilities including operations near the NIST campus. HVAC systems, loading docks, generators, and rooftop mechanical equipment at these facilities must comply with noise standards at property boundaries. New industrial and commercial developments require noise impact assessments as part of site plan review. The city planning department reviews site plans for noise mitigation including sound barriers, equipment enclosures, and landscaping buffers. Montgomery County Department of Environmental Protection conducts noise monitoring in response to complaints and can require corrective action.
County violations carry fines up to $500 per day. Businesses may face operating condition modifications or permit review for persistent noise exceedances.
Gaithersburg, MD
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Side-by-side rule comparisons with other cities in Montgomery County.
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