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St. Louis, MO Noise from Specific Sources: Car Alarm Limits (2026)

Few Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Car-alarm registration required
None: excluded by definition
15-min local-alarm cap (§8.13.140) applies
No: building alarms only
Only law that reaches a car alarm
General noise nuisance, §15.50.010
General noise-nuisance fine (§15.50.110)
$100–$500 per offense

Summary

St. Louis's alarm ordinance (Title 8, Ch. 8.13) defines "alarm subscriber" to exclude audible alarms on motor vehicles, so car alarms carry no city registration, permit, or 15-minute duration cap: only the general noise nuisance law applies.

"Alarm subscriber" means any person who leases, contracts for, buys or otherwise obtains and operates an alarm system for the purpose of obtaining response to the alarm, and on whose premises an alarm system is maintained, excluding audible alarms on motor vehicles and medical alarms.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 11).

Full Breakdown

The City's alarm-system chapter (8.13) regulates burglar, robbery, and panic alarms installed at a "premises" by an "alarm subscriber", but § 8.13.010 defines that term to specifically exclude "audible alarms on motor vehicles." That carve-out means a car alarm never triggers the Department of Public Safety registration ($25 residential fee), the alarm-identification-number requirement, false-alarm fines, or the 15-minute cap on "local alarms" set in § 8.13.140, those apply only to building alarm systems. A car alarm that won't stop blaring is addressed, if at all, only under the City's general noise-nuisance ban in § 15.50.010, which prohibits "unreasonably loud, disturbing or unnecessary noise" with no vehicle-alarm-specific decibel or time limit.

Violations & Fines

No alarm-code penalty applies to a car alarm itself. A neighbor's only recourse is a general noise complaint under § 15.50.010, punishable under § 15.50.110 by a $100–$500 fine per offense.

Frequently Asked Questions

Does St. Louis require car alarms to be registered like burglar alarms?
No. City Code § 8.13.010 defines "alarm subscriber" to exclude audible alarms on motor vehicles, so the registration and false-alarm rules in Chapter 8.13 don't apply to vehicles.
Can I report a car alarm that won't stop going off?
Yes, but only as a general noise complaint under § 15.50.010's ban on "unreasonably loud, disturbing or unnecessary noise": there's no car-alarm-specific ordinance or time limit.

Sources & Official References

Other rules in St. Louis

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