What Is the Alcohol Limit for a Commercial Driver in Texas?

In Texas, a commercial driver is held to a 0.04 BAC limit while operating a commercial motor vehicle. A BAC of 0.08 in a personal vehicle can still disqualify a CDL. Drivers who test between 0.02 and 0.039 are typically placed out of service for at least 24 hours under federal rules.

What counts as a commercial motor vehicle

A commercial motor vehicle is the type of vehicle that requires a CDL to operate. Think tractor-trailers, large box trucks, certain buses, and hazmat loads. When a driver is behind the wheel of a CMV on a public road in Texas, the lower 0.04 BAC standard applies.

Texas law and federal rules work together

Texas adopts federal safety standards for professional drivers. That is why the state applies 0.04 BAC to CMV operation and follows federal “out-of-service” rules for alcohol detection. An alcohol result of 0.04 or higher triggers removal from safety-sensitive duties and a return-to-duty process. A result from 0.02 to 0.039 leads to at least 24 hours out of service.

Disqualification of a CDL after a DWI

Even one alcohol-related event can cost a commercial driver a CDL for a significant period. In Texas: • A first “major” alcohol offense can bring a one-year CDL disqualification.
• If the driver was transporting hazardous materials, the disqualification can be three years.
• A second “major” offense can lead to a lifetime disqualification, with limited possibilities for reinstatement in some cases.
These disqualifications can stem from: driving a CMV at 0.04 or more, driving any vehicle at 0.08 or more, or refusing a chemical test.

What if the stop was in a personal vehicle

Texas can disqualify a CDL based on conduct in a non-commercial vehicle. A BAC of 0.08 or more in a personal vehicle is enough to trigger a CDL disqualification, even if the driver was off duty and not in a CMV at the time.

Refusing a breath or blood test

Refusal carries its own consequences through the Administrative License Revocation process. CDL holders face disqualification if they refuse a test, and they can also see a separate suspension of their personal driving privileges. These are civil penalties that run alongside any criminal case.

Zero tolerance vs. out-of-service

You may hear that CMV drivers cannot have “any alcohol.” Practically, that means two separate obligations. First, drivers cannot consume alcohol within four hours of going on duty and cannot have an alcohol result of 0.02 or more when tested, or they must be taken off duty for at least 24 hours. Second, at 0.04 or more while driving a CMV, a DWI charge and CDL disqualification risks come into play.

Common scenarios we see in Galveston County

Roadside test while hauling freight into the Port or down I-45: If a preliminary test suggests alcohol, officers may request an evidential breath or blood test. A confirmed 0.02 to 0.039 can sideline a driver for the day under federal rules. A 0.04 or more while in a CMV can trigger a DWI arrest and CDL consequences.

Stopped on the weekend in a pickup while off duty: A BAC at or above 0.08 can still lead to a CDL disqualification after conviction, even though the vehicle was not commercial. The criminal case and the CDL outcome are both critical.

What happens to your license after an arrest

Texas will try to suspend or disqualify through the ALR program as soon as you fail or refuse a test. You have a short window to request a hearing. Acting quickly preserves defenses and can keep you working while the case is pending.

How Zendeh Del & Associates, PLLC helps

Professional drivers call us because a CDL is a livelihood. Our team builds a defense that targets the stop, the testing process, and the state’s proof. Start with our Galveston DWI page to see how these cases are defended, then contact us for a case review.

Key takeaways for CDL holders

• 0.04 is the BAC limit while driving a CMV on Texas roads.
• 0.02 to 0.039 usually means an out-of-service order for at least 24 hours.
• 0.08 in a personal vehicle can still lead to a CDL disqualification.
• Refusal triggers ALR consequences and can disqualify your CDL.
• One year is common for a first major offense, three years with hazmat, and a second major offense risks a lifetime disqualification.

Practical steps if you were stopped or arrested

1. Write down everything you remember about the stop, the timing of any drinks, and any medications.

2. Protect deadlines. ALR hearings are time-sensitive.

3. Do not talk about the case with anyone but your lawyer.

4. Get a copy of the video and maintenance records for any breath device when possible.

5. Review work rules. Employers often have separate DOT compliance steps after an alcohol finding.

Local resources to learn more

For a deeper walk-through of DWI timelines, start here: What Happens After a DWI Arrest in Texas? Your Next Steps. If your case involves a warrant for blood during a holiday enforcement wave, read our page on No Refusal Weekends. Both are written for drivers in Galveston County.

Why commercial cases require a tailored defense

CDL cases add extra layers: federal regulations, employer policies, and more aggressive license consequences. The right strategy aims to defend both the criminal charge and your CDL status. Our firm has a dedicated DWI practice and publishes guides for drivers who need clear answers fast. Start with this overview: Fighting and Beating DWI Cases in Galveston County.

If you have a CDL and were stopped or arrested in Galveston County, talk with Zendeh Del & Associates, PLLC today. We will walk you through your options and help you protect your license and your future.