Quiet hours in Gaithersburg, MD — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Gaithersburg enforces noise regulations under City Code Chapter 15 and Montgomery County Code Chapter 31B. Noise that is plainly audible beyond property boundaries during nighttime hours may result in violations. The city follows county-level enforcement standards with additional municipal protections for residential zones.
Gaithersburg City Code Chapter 15 addresses noise disturbances within city limits. Montgomery County Code Chapter 31B provides the broader framework, establishing maximum permissible sound levels for residential, commercial, and industrial zones. In residential areas, daytime limits are generally 65 dBA and nighttime limits are 55 dBA measured at the receiving property line. Nighttime is defined as 9 PM to 7 AM on weekdays and 9 PM to 9 AM on weekends and holidays. Exemptions exist for emergency vehicles, construction during permitted hours, and special events with permits. The city operates a non-emergency line at (301) 258-6400 for noise complaints. Montgomery County Department of Environmental Protection also handles noise enforcement under County Bill 35-20 standards. Persistent violations in residential neighborhoods can trigger both municipal and county enforcement actions.
County noise violations carry fines up to $500 for a first offense and up to $1,000 for repeat offenses. City code violations may result in civil citations with fines starting at $100.
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Side-by-side rule comparisons with other cities in Montgomery County.
See how other cities in Montgomery County handle quiet hours.
See how Gaithersburg's quiet hours rules stack up against other locations.
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