Dark red TEOCAL sleeper cab parked in a sunny logistics yard near white trailers, containers, and a warehouse under a clear blue sky
AI-generated illustration of a TEOCAL cab in a California logistics yard. This image was created for the article and is not a photograph of Teocal Transport staff, customers, or facilities.
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Gregory Motta

Gregory Motta is a web developer in the San Francisco Bay Area, where he spends his days turning caffeine into code. When not staring at screens or debugging other people's CSS nightmares, he's exploring local farmers' markets or perfecting his coffee brew. Questions or comments? You can reach him at gregory@mottaindustries.com

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California Advanced Clean Fleets: Separating Headlines From What Still Applies

California Advanced Clean Fleets headlines often confuse public-fleet rules with private purchasing duties and with Clean Truck Check testing. Read the January 2025 waiver letter and current official CARB pages before writing a routing-guide mandate.

Headlines about California truck rules often collapse two different programs into one sentence: trucks are being forced electric, and every carrier you use this year must prove it. That sentence is not a reliable buying instruction. Advanced Clean Fleets is a fleet-composition rulemaking story with a specific legal history. Clean Truck Check is a separate emissions-testing program that continues to apply on its own terms. Shippers who tender freight into California, or who hire carriers that operate there, need to keep those files apart.

This overview follows official CARB and EPA documents a reader could check in September 2026. Those public files are educational, not legal advice, and they create no 2026 private-fleet mandate to purchase zero-emission tractors. If a later official page changes the picture, read that newer page.

What CARB’s Advanced Clean Fleets page currently describes

CARB’s Advanced Clean Fleets program page describes the regulation as requiring state and local government agency fleets to reduce emissions by increasing the use of zero-emission vehicles as vehicles are normally replaced. That is a public-fleet description. It is not the same thing as a rule that every private trucking company must replace its diesel equipment on a 2026 purchase calendar.

The same program page includes an “Advanced Clean Fleets 2025 Amendments Update.” It states that, during the first reporting cycles of the amended ACF regulations, CARB will focus on supporting compliance on a case-by-case basis as agencies make good-faith efforts to comply. A June 1, 2026 CARB guidance document expands on that point: CARB intends to emphasize education and outreach during those first reporting cycles, to focus on reporting requirements and flexibility provisions, and to work with agencies case by case.

That guidance also states the purpose of the amendments: improve compliance flexibility for public fleets, repeal the High Priority Fleets and Drayage portions to provide greater regulatory certainty for private fleets, and clarify responsibilities related to vehicles under contract. It says the regulation, as proposed to be amended, does not apply to private fleets, while also making clear that a public agency’s fleet includes vehicles it directly owns as well as vehicles it rents, leases, or contracts to operate on its behalf.

CARB’s Advanced Clean Fleets regulation and advisories page lists the state and local government agency fleet requirements as approved by the Office of Administrative Law and filed with the Secretary of State, effective September 10, 2026. That dated listing is why a late-September reading can describe the amendments as an effective state-and-local-government package rather than only as a future proposal. It is still not a private-fleet purchase mandate.

Keep the federal waiver history in its own folder

Separately, on January 13, 2025, CARB sent a letter to the U.S. Environmental Protection Agency withdrawing its Clean Air Act section 209(b) waiver request and section 209(e)(2) authorization request for the Advanced Clean Fleets regulation, docket EPA-HQ-OAR-2023-0589. The letter is a dated primary document hosted by EPA and signed by CARB’s executive officer.

That withdrawal is an important part of the federal story. It is not a reason to ignore what CARB still publishes for state and local government fleets, and it is not a reason to ignore Clean Truck Check. It is also not a hidden instruction that private carriers must buy zero-emission trucks in 2026 anyway. If someone tells you otherwise, ask them to point to the current official page rather than to a headline or a slide deck from an earlier phase of the rule.

The June 2026 guidance notes that public agencies must report certain vehicles they contract to operate on their behalf when determining compliance, and that private fleets are not subject to the ACF state and local government regulations. Those two sentences can both be true and still leave a gray area for a contractor whose vehicles are under a public agency’s operational control. That is a question for the official guidance and, where needed, for counsel. It is not a basis for telling every Western freight carrier that ACF now requires a private ZEV purchasing plan.

Technician in a dark red polo, gloves, and safety glasses working under a raised truck chassis beside a tool cart in a clean service bay
AI-generated illustration of undercarriage work in a professional service bay. This image was created for the article and is not a photograph of Teocal Transport staff, customers, or facilities.

Do not confuse Advanced Clean Fleets with Clean Truck Check

Clean Truck Check is California’s heavy-duty inspection and maintenance program. CARB’s Clean Truck Check testing-requirements page describes periodic emissions testing, including a semi-annual default for most covered vehicles, different methods for OBD-equipped and older vehicles, and a later change in testing cadence for OBD-equipped vehicles beginning in October 2027. Passing results may be submitted before a due date shown in the Clean Truck Check vehicle information system, and high-emitter screening can still trigger additional testing.

Those are testing and compliance questions: has the vehicle been tested as required, and is it in the official system? They are not questions about whether a carrier’s next tractor purchase must be a zero-emission model under ACF. Mixing the two programs leads buyers to ask carriers for the wrong proof — a ZEV purchasing affidavit when they meant a testing status, or a testing printout when they meant fleet-rule applicability.

If your team tenders freight into California regularly, keep two bookmarks. One should be the Clean Truck Check testing page. The other should be the Advanced Clean Fleets program page, plus the January 13, 2025 withdrawal letter if you need the federal-waiver history. When a carrier’s explanation disagrees with those pages, ask for the official source.

Dark red TEOCAL tractor pulling a plain white dry van on a sunny multi-lane highway with golden hills in the background
AI-generated illustration of a TEOCAL dry van on a Western highway. This image was created for the article and is not a photograph of Teocal Transport staff, customers, or facilities.

Questions shippers can ask without inventing a mandate

A California-lane conversation in late 2026 can stay useful if it stays specific:

  • Are we talking about Clean Truck Check testing status, about Advanced Clean Fleets, or about both?
  • If the question is ACF, is the freight or the fleet tied to a state or local government agency, or is this a private commercial shipment?
  • What official CARB or EPA page is the other party relying on, and what is the date on that page?
  • If a public agency is hiring vehicles under contract, has that agency said how it will report or handle those vehicles under the current ACF language?
  • What proof, if any, do you actually need from the motor carrier before tender — and does that proof match the program you named?

Those questions protect you from two opposite mistakes. One is assuming ACF disappeared entirely because the federal waiver request was withdrawn. The other is assuming every private carrier hauling in California must now show a 2026 ZEV purchase plan. The official pages support a narrower, more careful reading: public-fleet requirements remain the center of what CARB describes, amendments were framed to give public agencies flexibility and to repeal high-priority and drayage portions aimed at private fleets, and Clean Truck Check remains a separate testing program.

Across Teocal’s published twelve-state Western service area, California is one market among others, but it is the market where these two programs are most often confused. Teocal is a Hayward, California-based carrier. Our page on why shippers choose Teocal describes Western freight work and a five-point service pledge focused on communication and standing behind the work. Those pages are a starting point for a service conversation. They are not a certification of Advanced Clean Fleets status, Clean Truck Check results, or any unpublished fleet-composition claim.

What a private shipper should, and should not, demand in a routing guide

Most commercial shippers hiring a for-hire truck to move ordinary freight are not themselves state or local government fleet owners. For those buyers, the practical ACF task is narrower than the headline: do not write a routing-guide clause that recites an obsolete private-fleet purchase schedule, and do not accept a sales claim that “ACF is gone” without reading the current public-fleet page. If your organization is a government agency, or if you supply vehicles that a government agency contracts to operate, the official guidance is the document to use, not a freight-blog paraphrase.

A routing guide can still ask useful California questions that do not depend on inventing ACF duties. You can ask whether the carrier is prepared to discuss Clean Truck Check as a testing program, whether it will identify the legal entity operating the truck, and whether it will notify you if a California compliance issue will prevent a pickup or delivery. Those are operational questions. They are not a demand for a private ZEV purchasing affidavit that the current ACF pages do not describe as a general duty of every motor carrier.

Be careful with contractor language. The June 2026 guidance says public agencies report vehicles they contract to operate on their behalf, and that private fleets are not subject to the state and local government ACF regulations. If you are a private carrier, or you hire one, and the only relationship is an ordinary freight tender, do not leap from those sentences to a conclusion that every California load now carries public-fleet reporting duties. If you are bidding work in which a public agency will direct specific vehicles as part of its fleet, ask the agency how it intends to handle reporting and which official section it is applying.

Read dates as carefully as you read headlines

ACF has generated several dated documents that are easy to shuffle. The original program was adopted earlier in the decade. CARB withdrew the federal waiver and authorization request on January 13, 2025. Amendment language for public fleets moved through 2025 and 2026, including initial amendment language noted as released on July 29, 2025, later 15-day modifications, June 1, 2026 guidance, and an OAL effective date of September 10, 2026 for the state and local government agency fleet requirements listed on CARB’s advisories page. Each of those dates answers a different question.

When you cite ACF in an internal memo or a vendor packet, write the document name and the date. “CARB said” is not a citation. “The January 13, 2025 withdrawal letter” and “the June 1, 2026 public-fleet guidance” and “the advisories page listing a September 10, 2026 effective date” are citations another person can check. If your team later sees a newer official document, add it rather than silently updating an old sentence.

Use the official text that exists when you write the memo. If you later see a newer official document, add it rather than rewriting history so that an older note appears to have known the later fact.

Use official pages, then ask a precise question with the next quote

If you are tendering California freight and need to sort a headline from an enforceable or still-applicable requirement, bring the official links to the conversation. Ask Teocal, or any other carrier, which program you are discussing and what documentation actually applies to the trucks that would haul your freight. You can start that exchange with a freight quote request. A precise question will not settle every future amendment, but it will keep a 2026 routing decision from being made on a slogan that never matched the CARB page.

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