CARB Clean Truck Check: what out-of-state operators need to know in 2026
California's Clean Truck Check fee is $32.13 for 2026. In January 2026 the EPA disapproved the rule for out-of-state trucks, but CARB says it is still enforcing. The standoff, explained.
If you run into California, the Clean Truck Check is suddenly a moving target. The 2026 annual compliance fee is $32.13 per vehicle, and California says the program covers out-of-state trucks operating in the state. But in January 2026 the EPA disapproved the rule as applied to out-of-state trucks – and CARB says it is enforcing anyway. Here is the standoff, neutrally, so you can decide how to handle your own trucks. This is not legal advice; verify your situation with CARB.
What Clean Truck Check is
Clean Truck Check (CARB’s Heavy-Duty Inspection and Maintenance program) requires most non-gasoline trucks over 14,000 lbs that operate in California to register in CARB’s system, pay an annual compliance fee, and submit periodic passing emissions tests. The 2026 fee is $32.13, up from $31.18 in 2025 under a CPI adjustment.
The federal twist: EPA’s January 2026 disapproval
On January 27, 2026, the EPA issued a final rule disapproving the inspection-and-maintenance requirement as applied to out-of-state and foreign-registered trucks, citing Commerce Clause concerns about a state regulating vehicles merely passing through. The EPA approved the program only for California-registered vehicles. Trade coverage framed it plainly: EPA would not back enforcement on out-of-state trucks.
CARB’s response: still enforcing
CARB did not back down. In a March 10, 2026 update, the agency said it will continue to enforce Clean Truck Check against all vehicles operating in California – including out-of-state trucks – even though those emissions reductions can no longer be credited in California’s federal clean-air plan. So you have a state agency saying “comply” and a federal agency saying the state cannot require it of you.
Where that leaves you
- California-registered trucks: You clearly remain subject. Keep your registration, fee, and testing current.
- Out-of-state trucks: The practical enforcement risk remains unsettled. CARB says comply; EPA did not approve the out-of-state reductions into California’s SIP. Document your status and verify the current requirement before each California trip.
Whichever bucket you are in, do not rely on a forum post or this article as the final word – verify the current requirement directly with CARB before a California trip, because this can change with a court order. Compliance pressure like this is also why your broader safety and equipment paperwork – your CSA record and a properly registered ELD – needs to be airtight when you run a heavily enforced state.
The bottom line
For 2026, the fee is $32.13 and California-registered trucks are squarely covered. For out-of-state operators, it is a live enforcement mismatch: EPA disapproved the out-of-state reach for SIP purposes in January, while CARB says the compliance requirement still applies. Keep your options documented and confirm with CARB before you count on either side winning.
Frequently asked questions
How much is the Clean Truck Check fee in 2026?
$32.13 per vehicle, adjusted up from $31.18 in 2025 by the California Consumer Price Index.
Does Clean Truck Check apply to out-of-state trucks?
That is exactly what is in dispute. CARB says yes - out-of-state trucks operating in California must comply. But in January 2026 the EPA disapproved the rule as applied to out-of-state and foreign vehicles. The legal status is unsettled.
What did the EPA do?
On January 27, 2026, the EPA issued a final rule disapproving California's heavy-duty inspection-and-maintenance requirement for out-of-state and foreign-registered trucks on Commerce Clause grounds, while approving it for California-registered vehicles.
What should an out-of-state operator do right now?
Verify the current requirement directly with CARB before you rely on either position. California-registered trucks remain subject; out-of-state operators face a practical enforcement mismatch between CARB's compliance demand and EPA's SIP disapproval.
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