Iron County, UT Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Engine-brake rule
- § 8.20.060(D)(4), 10 p.m.-7 a.m., 20 ft
- Exhaust/muffler rule
- § 8.20.060(D)(5), no time limit
- Covers
- Defective exhaust, no muffler, cut-out devices
- Max criminal penalty
- $1,000 fine and/or 6 months jail
- Exempt vehicles
- Government/emergency on public business
Summary
Iron County Code Section 8.20.060(D)(4) and (D)(5) target vehicle noise directly: an engine brake running audibly 20 feet away between 10 p.m. and 7 a.m., or any vehicle operated with a defective exhaust, no muffler, or a cut-out or by-pass device, is prima facie evidence of a noise nuisance violation in unincorporated Iron County.
4.The operation of any motor vehicle in a residential area with a dynamic braking device engaged, except to avoid imminent danger, between the hours of ten p.m. and seven a.m. in such a manner as to be plainly audible at a distance of twenty feet from the source.5.Operating or causing to be operated a motor vehicle: (a) with a defective exhaust system that affects sound reduction; (b) without a muffler or other noise dissipative device; and/or (c) equipped with any cut-out, by-pass, or similar device.
Full Breakdown
Subsection D(4) makes it prima facie evidence of a violation to operate a motor vehicle in a residential area with a dynamic braking device (engine brake) engaged, except to avoid imminent danger, between 10 p.m. and 7 a.m. in a manner plainly audible at 20 feet from the source. Subsection D(5) separately and without a time limit treats it as prima facie evidence to operate or cause to be operated a motor vehicle with a defective exhaust system that affects sound reduction, without a muffler or other noise dissipative device, or equipped with a cut-out, by-pass, or similar device.
Because D(5) carries no nighttime qualifier, a defective muffler or cut-out device can support a citation at any hour, unlike the engine-brake rule in D(4), which is tied to the 10 p.m. to 7 a.m. window. Both provisions supplement the general nuisance standard in subsection A and the nine factors in subsection C, and both are enforced without a prior notice to abate under subsection G given the time-sensitive nature of noise complaints. Government and emergency vehicles engaged in necessary public business remain exempt under subsection E(1).
Violations & Fines
A vehicle noise violation under Section 8.20.060(D)(4) or (D)(5) is enforced as a Chapter 8.20 nuisance: an administrative citation can carry a fine up to $200 per week under Section 8.20.160(B), and a criminal citation under Section 8.20.130 is a Class B misdemeanor punishable by up to $1,000 and six months in jail, with each day treated as a separate offense and appeal available to the hearing officer within 30 days.
Frequently Asked Questions
Is engine braking illegal in unincorporated Iron County?
Can I be cited for a loud muffler at any time of day?
What is the penalty for a vehicle noise citation in Iron County?
Sources & Official References
Other rules in Iron County
Compare Iron County to another location·View the Utah noise ordinances overview
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