If you’re driving in Texas in 2025, the legal blood alcohol concentration (BAC) limit is 0.08% for most adult drivers. That is the point at which the law presumes you are intoxicated. But Texas also has stricter limits for certain groups: 0.04% for commercial drivers, and zero tolerance for anyone under 21. Understanding these numbers — and how they’re enforced — matters because a DWI in Texas comes with serious consequences even if your BAC is below the standard limit. Texas takes impaired driving very seriously, and the rules haven’t become more relaxed in 2026.
The Standard Adult Limit: 0.08% BAC
Under Texas Penal Code §49.01 and §49.04, a driver is considered legally intoxicated when:
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Their BAC reaches 0.08% or higher, OR
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They have lost “normal use of mental or physical faculties” due to alcohol or drugs
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Even prescription medications can count
This means you don’t have to be at 0.08% to be arrested. If an officer believes your driving is impaired — drifting lanes, delayed reactions, unsafe speed control — you may still be charged.
At 0.08%, however, the law presumes intoxication, and prosecutors do not have to prove impairment. The number alone is enough for a DWI.
Commercial Drivers: 0.04% BAC Limit
Commercial drivers in Texas — truckers, bus drivers, and anyone holding a CDL — face a much lower limit:
Legal BAC for CDL drivers: 0.04%
This applies when driving a commercial vehicle. Because of the size and danger associated with heavy trucks and passenger buses, the expectation is stricter, and penalties hit harder.
Even a first-time violation can result in:
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CDL suspension
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Job loss
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Higher insurance rates
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Criminal charges depending on circumstances
CDL holders driving personal vehicles are still subject to the 0.08% standard, but any alcohol-related offense affects their commercial license.Minors and Under-21 Drivers: Zero Tolerance
Texas follows a Zero Tolerance rule for anyone under age 21:
Legal BAC for under-21 drivers: 0.00%
Even a tiny amount of alcohol — any detectable BAC — can lead to charges. Minors can be cited for Driving Under the Influence (DUI), which is different from an adult DWI but still serious.
Penalties may include:
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Fines
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License suspension
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Mandatory alcohol awareness classes
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Community service
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Long-term record consequences
A minor with a BAC of 0.08% or higher will face a full adult DWI, not just a minor-level DUI.
Can You Be Arrested Below 0.08%? Yes.
Texas law allows officers to charge you with DWI even when your BAC is below 0.08% if there is evidence of impairment. This includes:
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Slurred speech
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Failing field sobriety tests
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Dangerous or erratic driving
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Admission of drinking
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Smell of alcohol
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Open containers
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Physical signs of intoxication
In other words, 0.08% is the legal presumption, not the minimum threshold for arrest.
Open Container Laws Affect BAC Enforcement
Texas Penal Code §49.031 makes it illegal to have an open container of alcohol in the passenger area of a motor vehicle, even if the driver is sober. If you have both:
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Open container and
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Any amount of alcohol in your system
your situation becomes riskier, because officers are far more likely to investigate impairment.
What Happens If You Refuse a Breath or Blood Test?
Texas has an implied consent law. When you drive on Texas roads, you automatically agree to testing if an officer has reasonable suspicion of intoxication.
If you refuse:
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Your license is automatically suspended (usually 180 days for first refusal)
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You may still be arrested
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Prosecutors can use your refusal as evidence
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The officer may get a warrant for a blood draw anyway
In 2025, Texas agencies use “no-refusal weekends,” where judges are on standby to issue immediate warrants for blood tests.
Penalties for DWI in Texas
Even a first offense can have a lasting impact.
First Offense (Class B misdemeanor)
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Up to 180 days in jail
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Up to $2,000 fine
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Driver’s license suspension
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Mandatory education programs
Second Offense
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Up to 1 year in jail
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Up to $4,000 fine
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Longer license suspension
Third Offense (Felony)
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2–10 years in prison
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Up to $10,000 fine
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Long-term license revocation
Enhanced penalties apply if:
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BAC is 0.15% or higher
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A child is in the vehicle
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An accident causes injury or death
What Texas Drivers Should Keep in Mind
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0.08% is the legal limit, but impairment-based arrests can happen below that.
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For anyone under 21, any detectable alcohol is illegal.
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For commercial drivers, the 0.04% limit is strictly enforced.
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Field sobriety tests, officer observations and open containers all influence arrests.
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Texas courts and DPS take DWI very seriously, and even a first offense can affect jobs, insurance and future opportunities.
Final Take
In Texas, the legal blood alcohol level is 0.08% for most adults, 0.04% for commercial drivers and zero tolerance for anyone under 21. But real-life enforcement goes beyond numbers — you can still be charged if your driving is impaired or if officers detect signs of intoxication. If you plan to drink, the safest legal advice remains the simplest: don’t drive.
