California is moving forward with enforcing its Clean Truck Check requirements on out-of-state trucks, even after the Environmental Protection Agency (EPA) said the state cannot include those vehicles in its federally approved air quality plan.
Clean Truck Check, officially known as the Heavy-Duty Inspection and Maintenance (HD I/M) Regulation, is part of California’s effort to reduce emissions from heavy-duty vehicles. The program requires truck owners to register with the California Air Resources Board (CARB), pay annual compliance fees, and prove that emissions control systems are working properly through testing or inspections.
While the EPA recently rejected California’s request to apply the rule to trucks registered outside the state under the Clean Air Act, California regulators say enforcement will continue regardless.
What the EPA Rejected — and What It Didn’t
The EPA said California failed to show that enforcing Clean Truck Check on out-of-state trucks complies with the Commerce Clause of the U.S. Constitution, which limits states from interfering with interstate trade.
Because of that, the EPA approved the program only for California-registered trucks within the state’s official State Implementation Plan (SIP). The agency did not approve enforcement tied to trucks registered elsewhere.
However, the EPA’s decision does not block California from enforcing the rule under state authority. Instead, it means emissions reductions from out-of-state truck inspections won’t count toward California’s federally required air quality targets.
California’s Position: Nothing Changes for Truckers
CARB quickly responded, stating that the EPA has no authority over Clean Truck Check enforcement. According to CARB, the rule remains fully enforceable for any heavy-duty truck operating in California, regardless of registration state.
CARB spokesperson Lindsay Buckley dismissed the EPA decision as largely procedural, emphasizing that inspections, fees, and compliance requirements for out-of-state trucks will continue as before.
In practical terms, truckers should not expect enforcement relief just because the EPA raised concerns.
Why California Is Targeting All Trucks
CARB argues that heavy-duty trucks are a major source of pollution in the state:
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Heavy-duty vehicles generate 52% of on-road NOx emissions
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They account for 54% of on-road PM2.5 emissions
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About half of all heavy-duty trucks operating in California are registered out of state
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Those trucks produce roughly 30% of heavy-duty NOx emissions
CARB says exempting out-of-state trucks would significantly weaken its air quality strategy.
What Truck Owners Are Required to Do
Clean Truck Check applies to non-gasoline vehicles over 14,000 GVWR operating in California. A limited five-day pass-through exemption is available once per year. Requirements include:
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Registering owner and vehicle information with CARB
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Paying annual Clean Truck Check compliance fees
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Completing emissions compliance tests using CARB-approved testers
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Submitting test results to CARB on a scheduled basis
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Carrying a valid HD I/M compliance certificate in the vehicle
Trucks with onboard diagnostics (OBD) may use electronic testing, while older trucks must undergo smoke opacity and visual inspections.
For carriers and owner-operators, the takeaway is straightforward: if your truck runs in California, Clean Truck Check still applies — no matter where it’s registered.
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