Santa Cruz County, CA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Muffler noise limit
- 97 dBA at 20 inches (SAE J-1287)
- Quiet hours
- No riding after sunset or before 8 a.m.
- Daily use cap
- 2 hours per property per day
- Dwelling buffer
- 300 feet, § 9.52.045(A)
- Spark arrester
- U.S. Forest Service-approved, required always
- Repeat-offense penalty
- Misdemeanor after 3 convictions/12 months
Summary
Off-road vehicles operated in unincorporated Santa Cruz County must run a muffler or spark arrester that keeps exhaust noise at or below 97 dBA measured from 20 inches, under SCCC § 9.52.050. A companion offensive-noise rule bars riding after sunset or before 8:00 a.m. and caps operation at two hours a day on any single property.
It is unlawful for any person to operate an off-road vehicle on any private property within the unincorporated area of Santa Cruz County, not including property which is subject to noise standards established by the Vehicle Code ... when the vehicle is not equipped with a muffler, silencer or other noise-suppression device, which limits exhaust noise emissions to not more than 97 dBA, when measured from a distance of 20 inches using test procedures established by the Society of Automotive Engineers under Standard J-1287.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 5004302; v11 updated 2026-05-19; through 05-19-2026).
Full Breakdown
S. Forest Service-approved spark arrester at all times. Subsection (B) sets the noise ceiling for private property outside standard Vehicle Code noise jurisdiction (fire trails, logging roads, service roads and rough graded trails): the vehicle must be equipped with a muffler, silencer, or other noise-suppression device limiting exhaust emissions to no more than 97 dBA, measured from 20 inches using SAE Standard J-1287 test procedures. Cutouts, bypasses, and exhaust modifications that amplify noise are banned outright, and the exhaust system must stay in gas-tight condition.
060 layers on a separate "offensive noise" standard: it is unlawful to operate an off-road vehicle in a manner that "unreasonably disturbs or annoys any person with ordinary sensitivities," judged against factors like ambient noise, terrain, number of vehicles, hours, duration, and proximity to occupied dwellings. , or riding for more than two hours total on a single property in one day. 045(A), separately bars operating an off-road vehicle within 300 feet of any occupied dwelling unless the operator is entitled to use that property. 050(C)).
Violations & Fines
A knowing and willful violation of Chapter 9.52 is a misdemeanor punishable under SCCC § 1.12.030; an ordinary violation is an infraction fined under § 1.12.040, escalating to a misdemeanor if the same person has three or more Chapter 9.52 convictions within the preceding 12 months (SCCC § 9.52.070). Where the Planning Director finds a habitat-related violation under § 9.52.045(B) or (C), the County can also pursue code enforcement remedies under Chapter 16.22.
Frequently Asked Questions
How loud can an off-road vehicle be in unincorporated Santa Cruz County?
Are there quiet hours for dirt bikes and off-road vehicles in the county?
What happens if my off-road vehicle fails the noise or spark arrester requirement?
Sources & Official References
Other rules in Santa Cruz County
California rules heatmap·Compare Santa Cruz County to another location·View the California noise ordinances overview
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