In January 2026 the EPA issued a partial disapproval tied to Clean Truck Check, and the headlines made it sound like the program was dead. For a California-registered fleet, the requirement still stands. The gap between the headline and the rule is where operators get into trouble.
On January 27, 2026, the EPA finalized a partial disapproval of California's State Implementation Plan as it relates to Clean Truck Check. A State Implementation Plan is the document a state submits to show how it will meet federal air-quality standards. The disapproval was narrow: it addressed whether California could count emission reductions from out-of-state vehicles toward its federal air-quality obligations.
According to CARB, the decision means the state cannot credit that out-of-state portion toward meeting federal standards. CARB's position is that the ruling does not determine or limit its authority to enforce Clean Truck Check on vehicles operating in California, a point the agency ties to footnote 49 of the EPA's final rule.
The short version: the EPA action was about federal air-quality accounting, not about whether your trucks have to comply. CARB's March 2026 guidance still requires subject vehicles, including out-of-state vehicles, to report, pay the annual fee, and submit passing tests.
The dispute is politically loud. The EPA framed its action around protecting truckers and businesses from costs. California's governor responded that the EPA is not stopping the state from enforcing its own law. Both sides have an incentive to overstate the reach of the ruling, which is how "EPA disapproves Clean Truck Check" turns into "you don't have to comply" in a dispatcher's group chat.
The federal enforceability piece was narrowed to non-gasoline combustion vehicles over 14,000 lbs registered in California. The state-level requirement to test and report is a separate question, and CARB has continued to enforce it.
The safest read for a small fleet: nothing about your obligations changed, and acting as if the program went away is the expensive mistake.
Sources: CARB Clean Truck Check program page (March 10, 2026 update) · EPA final action announced January 27, 2026 · CARB statement referencing footnote 49 of the EPA final rule. CarbAudit is an independent referral service and does not provide legal advice.
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