Prince William County, VA Noise from Specific Sources: Car Alarm Limits (2026)
Key Facts
- Car alarms
- Expressly exempt from noise limits
- Governing section
- PWC Code § 14-5(8)
- What IS regulated
- Vehicle stereos audible past 50 ft
- Enforcement for alarms
- None under Chapter 14
Summary
Prince William County's noise ordinance bans amplified sound blasting from a parked or moving vehicle beyond 50 feet, but Sec. 14-5(8) carves out a specific exception for car alarms. A vehicle's factory or aftermarket security alarm can sound as loud as it needs to without breaking county noise law, no matter how long it runs or how far it carries.
Playing, operating or permitting to be operated, any sound production device mounted on or in any motor vehicle while the motor vehicle is operated or parked on a public street alley, parking lot open to the public, or public park, and which emits sound audible from outside the motor vehicle at a distance of 50 feet or more. The provisions of this subsection shall not apply to sound emissions from motor vehicles alarms or other security devices, the emission of sound for purposes of alerting persons to the existence of an emergency, or the emission of sound in performance of emergency work.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 46 Update 4).
Full Breakdown
Sec. 14-5(8) makes it a violation to play or operate 'any sound production device mounted on or in any motor vehicle' on a public street, alley, public parking lot, or public park if the sound is 'audible from outside the motor vehicle at a distance of 50 feet or more' while the vehicle is parked or being driven. ' A car alarm going off in a driveway, parking lot or on the street is therefore lawful noise under county code, however loud or long it sounds, and county investigators have no decibel or duration standard to enforce against it.
Chapter 14's general Table 1 property-line limits in Sec. 14-4 still theoretically apply to non-exempt equipment, but the Sec. 14-5(8) carve-out is written broadly enough to cover alarms triggered by theft, tampering, or a car's own security system malfunctioning. Residents bothered by a neighbor's alarm have no noise-ordinance remedy; the practical options are contacting the vehicle's owner directly or, if the alarm suggests an actual break-in, calling police non-emergency dispatch.
Violations & Fines
Because car alarms are exempted outright, there is no fine or misdemeanor charge available under Chapter 14 for alarm noise itself. A person who instead plays a car stereo audible beyond 50 feet, the conduct Sec. 14-5(8) actually targets, faces the same penalties as any other noise violation: a Class 4 misdemeanor and up to a $250 fine for a first offense, rising to a Class 3 misdemeanor and up to $500 for a repeat offense within 365 days under Sec. 14-2.
Frequently Asked Questions
Can I be cited for my car alarm going off repeatedly?
What vehicle noise IS illegal in Prince William County?
What can I do about a neighbor's constantly triggering car alarm?
Sources & Official References
Other rules in Prince William County
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