Eagle Mountain, UT Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Jake brake rule
- EMMC 8.15.080(L)
- Exhaust/muffler rule
- EMMC 8.15.080(S)
- Idling limit
- 15 minutes in residential zone, EMMC 8.15.080(O)
- Defective-vehicle rule
- EMMC 8.15.080(M)
- Penalty
- Class B misdemeanor, up to $1,000
Summary
Eagle Mountain bars operating a motor vehicle with a Jake brake or other dynamic braking device engaged except to avoid imminent danger, and separately requires every vehicle's exhaust system to be free of sound-reduction defects, fitted with a working muffler, and free of any cutout or bypass device. EMMC 8.15.080(L) and (S) govern.
L. Dynamic Braking Device. ... Operating any motor vehicle with a dynamic braking device engaged, except for the avoidance of imminent danger; ... ... S. Motor Vehicle Noise. Operating or causing to be operated any motor vehicle unless the exhaust system is free from defects that affect sound reduction; equipped with a muffler or other noise dissipative device; and not equipped with any cutout, bypass or similar device.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance O-34-2026, passed August 4, 2026).
Full Breakdown
010 as a device, commonly called a Jacob's brake or Jake brake, that converts a truck's engine into an air compressor for braking without using the wheel brakes; the only exception is engaging it to avoid imminent danger. 080(S), Motor Vehicle Noise, separately requires every vehicle operated in the city to have an exhaust system free from defects that affect sound reduction, equipped with a muffler or other noise-dissipative device, and not fitted with any cutout, bypass, or similar device that would let exhaust bypass the muffler.
080(O) makes it unlawful to run a standing vehicle or its attached equipment so as to disturb a residential zone for 15 consecutive minutes or longer. 030.
Violations & Fines
A violation of EMMC 8.15.080(L) or (S) is a Class B misdemeanor under EMMC 8.15.040, punishable by a fine of up to $1,000, up to six months in jail, or both. EMMC 8.15.100 makes each day a defective muffler or an engaged Jake brake continues in use a separate violation, with the city attorney able to pursue abatement.
Frequently Asked Questions
Can a semi-truck use its engine brake on an Eagle Mountain street?
Is a straight-piped or modified exhaust legal in Eagle Mountain?
How long can a car idle loudly in a residential neighborhood before it's a violation?
Sources & Official References
Other rules in Eagle Mountain
Compare Eagle Mountain to another location·View the Utah noise ordinances overview
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Vehicle Noise in Nearby Cities
How other cities in Utah County handle vehicle noise.