Quiet hours in Rockville, MD — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Rockville enforces noise limits under MoCo Code Chapter 31B. Daytime runs 7 AM to 9 PM weekdays, 9 AM to 9 PM weekends. Nighttime limit is 55 dBA at residential property lines.
Noise in Rockville is governed by Montgomery County Code Chapter 31B, the Noise Control Law, enforced by the Montgomery County Department of Environmental Protection. Daytime is defined as 7 AM to 9 PM on weekdays and 9 AM to 9 PM on weekends and holidays. Nighttime runs from 9 PM to 7 AM on weekdays and 9 PM to 9 AM on weekends and holidays. Maximum permissible sound levels at a residential receiving property are 65 dBA during daytime and 55 dBA during nighttime. Noise sources operating continuously on a 24-hour basis must meet the stricter nighttime standard at all times. Complaints are investigated by the Montgomery County DEP Noise Control Program. Residents can file complaints online or by calling 311. The City of Rockville publishes the full Montgomery County Noise Ordinance as Appendix A to its own code, reinforcing local applicability. Exemptions exist for emergency vehicles, government operations, and agricultural activities.
First offense may result in a warning. Subsequent violations carry fines from $100 to $500 per occurrence. Persistent violations may result in a cease-and-desist order or injunctive relief through circuit court.
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Side-by-side rule comparisons with other cities in Montgomery County.
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