Arapahoe County, CO Environmental Rules: Vehicle Idling Restrictions (2026)
Key Facts
- Overnight idling cap
- 10 minutes, 7:00 p.m.–7:00 a.m.
- Applies to
- Permitted Oil & Gas Facilities only
- Where
- Unincorporated Arapahoe County only
- Enforcing agency
- County LGD, Public Works & Development
- Fine schedule
- Up to $15,000/day per violation
- Appeal window
- 14 days to Board of County Commissioners
Summary
In unincorporated Arapahoe County, engine idling at a permitted Oil and Gas Facility must be minimized at all times, and between 7:00 p.m. and 7:00 a.m. it is hard-capped at 10 minutes. The limit sits inside the Noise Mitigation Requirements every well pad approved by Use by Special Review must follow under Land Development Code § 5-3.6.
xiii. Engine idling shall be minimized. Between the hours of 7:00 p.m. and 7:00 a.m., engine idling is limited to 10 minutes.
Full Breakdown
6 in unincorporated Arapahoe County, it does not reach Aurora, Centennial, Littleton or any other incorporated town, and it is not a general anti-idling ordinance for cars, trucks, or ordinary businesses. 6, ¶ l), the same list that sets a 60 dBA / 65 dBC Maximum Permissible Limit for facility-pad noise measured at the nearest occupied structure's property line. Operators must also run a County-approved third-party noise monitoring program in 15-minute increments through the first six months of production and keep the data two years, and the idling minimization requirement functions as one of the mitigation practices that keeps facility noise under that limit.
A parallel provision requires Operators to minimize vehicle and engine idling on CDPHE-declared Ozone Air Quality Action Days as part of the facility's Air Quality Mitigation Plan. 6, up to $15,000 for the first violation and $15,000 per day it continues. 7 as printed in the Code.
Violations & Fines
The Director of Public Works and Development issues a written Notice of Violation identifying the specific idling or noise standard breached and the corrective action required. Fines run up to $15,000 for an initial violation and up to $15,000 per day for each day it continues, payable within 30 days of the fine notice. An Operator may appeal a fine to the Board of County Commissioners within 14 days under § 5.3.6.P.7; the fine must still be paid pending appeal and is refunded if the appeal succeeds.
Frequently Asked Questions
Does the 10-minute idling limit apply to any vehicle in the county?
Is idling restricted during the day too?
Who enforces the idling rule?
What happens if an operator ignores the limit?
Sources & Official References
Other rules in Arapahoe County
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