Rockville, MD Noise Ordinances: Decibel Limits (2026)
Key Facts
- Delivery/loading curfew
- 10 p.m.-7 a.m.
- Exception threshold
- 55 dBA at lot line
- General noise authority
- Montgomery County Ch. 31B
- Generator testing hours
- Weekdays 7 a.m.-7 p.m.
Summary
Rockville zoning bars loading and deliveries on lots next to homes from 10 p.m. to 7 a.m. unless sound barriers cut noise to 55 dBA or less at the property line, per Sec. 25.8.8.1(c).
Delivery and loading operations are prohibited between 10:00
p.m. and 7:00 a.m. on any property abutting a residential use or residentially zoned
property. The Approving Authority of any development application may permit deliveries or
loading at times outside of these hours if the applicant submits evidence that sound
barriers between all areas for such operations effectively reduce noise to a level of 55 dBA
(A-weighted decibels) or less as measured at the lot line of any abutting property.
(d) Emergency generators. Emergency generators must comply with all noise regulations
applicable in the City. The periodic test operation of emergency generators must be
conducted only on weekdays between the hours of 7:00 a.m. and 7:00 p.m.
Full Breakdown
The City's zoning ordinance sets no general citywide decibel limit. Sec. 25.8.8.1(a) instead adopts Montgomery County Code Chapter 31B, Noise Control, for all development in Rockville. The one Rockville-specific numeric standard governs delivery and loading operations: they are banned between 10:00 p.m. and 7:00 a.m. on any lot abutting a residential use or residential zone. A development's Approving Authority may allow deliveries outside that window only if sound barriers are shown to hold noise to 55 dBA or less measured at the abutting lot line. Emergency generator testing is separately limited to weekdays, 7 a.m. to 7 p.m.
Violations & Fines
Deliveries or loading outside the 10 p.m.-7 a.m. window without an approved sound-barrier exception violate Sec. 25.8.8.1(c); general noise nuisances are enforced by Montgomery County under Chapter 31B, not by the City.
Frequently Asked Questions
Does Rockville set its own citywide noise limit?
When can deliveries happen near homes in Rockville?
Sources & Official References
Other rules in Rockville
Compare Rockville to another location·View the Maryland noise ordinances overview
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