California Air Resources Board (CARB)

United Contractors represents contractor interests with regard to CARB and Local Air District regulations, filings, enforcement, and in the development of compliance guidelines. We also provide resources to assist contractors wth their specific questions and needs.

  • Off-Road

    Your Off-Road Checklist
    Off-Road

    Tier 0. 
    NO fleet may add a vehicle with a Tier 0 engine to its fleet.

    Tier 1. 
    NO fleet may add a vehicle with a Tier 1 engine to its fleet.

    Tier 2. 
    Beginning January 1, 2018, for large and medium fleets, and January 1, 2023, for small fleets, no fleet may add a vehicle with a Tier 2 engine to its fleet. The engine Tier must be Tier 3 or higher.

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  • News | December 06, 2024

    California Air Resources Board (CARB) Deadlines and Requirements

    Prepare for these Upcoming CARB Deadlines

    Portable Diesel Engine Airborne Toxics Control Measure

    On January 1, 2025, all diesel engines with Tier 2 and Tier 3 emissions manufactured prior to 2009 become prohibited from operating in CA unless already designated low use or emergency use.

    Clean Truck Check Program (CTC)

    The 90-day compliance test window for diesel trucks with GVWR greater than 14,000 lbs. (Class 4 and up) with registrations due in January or July 2025 is now open.

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  • On-Road

    Your On-Road Checklist
    On-Road

    We reiterate here that this is a DIESEL Regulation. All Non-Diesel vehicles are currently exempt from regulation requirements.

    The regulation exempts non-diesel trucks and trucks less than 14,000 lb. GVWR. Light Duty Diesel Trucks are classified as those between 14,001 and 26,000 lb. GVWR, and Heavier Diesel trucks are classified as those over 26,001 lb. GVWR.

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  • Portable Power

    YOUR PORTABLE POWER CHECKLIST

    By way of background, portable equipment 50 horsepower and greater requires a permit from the local air district in which the unit is operating. To lessen the burden (and costs) of reporting in multiple air districts throughout the state, CARB established the Portable Equipment Registration Program (PERP), which enables fleet owners to acquire a statewide portable equipment permit for qualifying portable units. Note that this is a Voluntary Program, and, as such, may set rules and standards independent of local air district rules.

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