Pima County, AZ Environmental Rules: Vehicle Idling Restrictions (2026)
Key Facts
- Applies to
- Retail stores over 80,000 sq ft near housing
- Idling/loading curfew
- No activity 10 p.m.-6 a.m., § (C)(4)(a)
- Trash removal curfew
- No activity 7 p.m.-7 a.m., § (C)(4)(b)
- Daytime noise limit
- 65 dB at residential property line
- Nighttime noise limit
- 45 dB at residential property line
- Max civil penalty
- $750/day individual, $10,000/day corporation
Summary
When a large scale retail establishment (over 80,000 square feet) in unincorporated Pima County sits next to a residential use, Code § 18.39.030(C)(4)(a) bars deliveries, loading, idling or similar operations between 10 p.m. and 6 a.m., unless the activity happens inside a loading bay or on the street side of the building.
4. Noise: When the large scale retail establishment is adjacent to an existing residential use, the following noise restrictions shall apply: a. Deliveries, loading, idling, or similar operations shall not occur between ten p.m. and six a.m. unless the activity occurs within a loading bay or on the street side of the building; and b. Trash removal or compaction, or similar operations, shall not be allowed between seven p.m. and seven a.m.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-64: Contains Supplement, with local legislation through Ordinance 2026-9, passed 7-28-2026, current through 7-28-2026).
Full Breakdown
030(B) as a single building over 80,000 square feet under one roof and ownership, sited in the CB-2, CI-1 or CI-2 commercial and industrial zones (with a limited CB-1 exception). , unless the activity occurs within a loading bay or on the street side of the building away from the residential lot line. m. If a proposed store can't meet either curfew, or the loading-area exposure and wall-height standards referenced in (C)(5), the developer must instead prepare a noise plan analyzing ambient conditions and mitigation measures, capped at specific decibel limits measured at the adjoining residential property line: 65 dB daytime and 45 dB nighttime for large retail and shopping centers next to housing.
That noise plan must specifically address truck idling and waiting, among other listed noise sources, and be reviewed against the county's commercial design manual, adopted by resolution of the Board of Supervisors.
Violations & Fines
A large retail store that runs deliveries, loading or truck idling past 10 p.m. next to a residential use, without an approved noise plan under § 18.39.030(C)(5), is out of compliance with its development standards and subject to zoning enforcement under § 18.95.030. Civil penalties under § 18.95.040 reach $750 per day for an individual and $10,000 per day for a corporation, with each day of continued noncompliance a separate offense, appealable to the Board of Supervisors and then Superior Court.
Frequently Asked Questions
Does Pima County limit truck idling at big-box stores near homes?
Is there a separate curfew for trash pickup?
What if a store can't meet the nighttime idling curfew?
Sources & Official References
Other rules in Pima County
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