Douglas County, CO Noise Ordinances: Vehicle Noise (2026)
Key Facts
- In county noise limits?
- No -- vehicles excluded
- Exclusion citation
- Section 1704A.08.2
- Governing law
- C.R.S. 42-4-225 (mufflers)
- Prohibited
- Exhaust cut-out or amplifier
- Enforced by
- Sheriff / State Patrol
Summary
Douglas County's Section 17A excludes motor vehicles, motorcycles, off-highway vehicles and snowmobiles from its noise limits. Loud vehicles are instead governed by Colorado's state muffler law, C.R.S. 42-4-225, which bans exhaust modifications that amplify engine noise.
The following uses and/or activities are excluded from the requirements of Section 1703A: ... 1704A.08.2 Motor vehicles, motorcycles, off-highway vehicles, and snowmobiles.
Full Breakdown
Section 1704A.08.2 lists 'motor vehicles, motorcycles, off-highway vehicles, and snowmobiles' among sounds excluded from the county's decibel limits, so a passing loud car is not a Zoning Resolution violation. Instead, Colorado Revised Statute 42-4-225 requires every registered vehicle to have an adequate, properly maintained muffler and prohibits cut-outs, bypasses, or exhaust modifications that amplify or increase engine noise above the original muffler. Enforcement is by the Colorado State Patrol and Douglas County Sheriff. Speed or endurance events are separately excluded only when authorized by the County Commissioners.
Violations & Fines
Loud/modified exhaust is a traffic offense under C.R.S. 42-4-225, enforced by law officers; the county noise resolution does not apply to vehicles.
Frequently Asked Questions
Can I report a loud motorcycle under the noise ordinance?
Are straight-pipe exhausts legal in Colorado?
Sources & Official References
Other rules in Douglas County
Compare Douglas County to another location·View the Colorado noise ordinances overview
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