
0.15 BAC DWI in Texas: Why a High Test Result Makes It a Class A Misdemeanor
By Luke A. Williams · DWI
Short answer: In Texas, a first DWI is normally a Class B misdemeanor, but it becomes a Class A misdemeanor if an analysis of your blood, breath, or urine showed an alcohol concentration of 0.15 or more at the time the test was performed. That raises the maximum punishment to one year in jail and a $4,000 fine, requires an ignition interlock if you are placed on probation, rules out deferred adjudication, and, with limited exceptions, doubles the state DWI fine to $6,000. Because the 0.15 level is an element of the offense, the State must prove it beyond a reasonable doubt, and the reliability of the test result is often the central issue in the case.

Many people arrested for DWI in Dallas-Fort Worth are surprised to see "Class A" on their paperwork. In most cases, the reason is a breath or blood test result of 0.15 or higher. This charge is sometimes called a "high BAC" or "aggravated" DWI, and it carries consequences that go well beyond a standard first offense.
At Howard Lotspeich Alexander & Williams, PLLC (HLAW), our Fort Worth DWI attorneys defend DWI charges in Tarrant, Dallas, Denton, Collin, Johnson, and Parker counties. This guide explains how Texas law treats a 0.15 BAC, what changes compared with a standard DWI, and the defense issues that come up most often.
Key Takeaways
- 0.15 or more makes a first DWI a Class A misdemeanor. Texas Penal Code §49.04(d) applies when "an analysis of a specimen of the person's blood, breath, or urine showed an alcohol concentration level of 0.15 or more at the time the analysis was performed" (Tex. Penal Code §49.04).
- The punishment range increases. A Class A misdemeanor carries up to one year in jail and a fine of up to $4,000, compared with up to 180 days and $2,000 for a Class B (Tex. Penal Code ch. 12).
- Deferred adjudication is not available. Texas allows deferred adjudication for many first DWIs, but not when "the defendant's alcohol concentration... was 0.15 or more" (Tex. Code Crim. Proc. art. 42A.102).
- An ignition interlock is mandatory on probation. If you are placed on community supervision after a 0.15 finding, the court "shall require" an ignition interlock device (Tex. Code Crim. Proc. art. 42A.408).
- The state DWI fine doubles. The additional state fine after a conviction is generally $3,000 for a first conviction within 36 months, but $6,000 if the test showed 0.15 or more (Tex. Transp. Code §709.001).
- Nondisclosure is off the table. The DWI nondisclosure statutes for people convicted of DWI exclude offenses punishable under §49.04(d) (Tex. Gov't Code §§411.0731, 411.0736).
- The 0.15 level is an element the State must prove. Courts have held it is part of a separate offense, not just a punishment enhancement, and must be proved at the guilt stage of trial (Navarro v. State, Tex. App. Houston 2015).
What Is a 0.15 BAC DWI in Texas?
Texas defines "intoxicated" two ways: not having the normal use of mental or physical faculties because of alcohol or another substance, or "having an alcohol concentration of 0.08 or more" (Tex. Penal Code §49.01). A first DWI is a Class B misdemeanor with a minimum term of confinement of 72 hours under §49.04(b).
Section 49.04(d) creates a higher level. If the State shows that a test "showed an alcohol concentration level of 0.15 or more at the time the analysis was performed," the offense is a Class A misdemeanor.
Two features of that language matter:
- It measures the test, not the driving. The statute looks at the result "at the time the analysis was performed." That differs from the 0.08 per se definition, which concerns alcohol concentration at the time of driving.
- It requires an actual analysis. The 0.15 level must be shown by a chemical analysis of blood, breath, or urine. Observations of impairment alone cannot establish a Class A charge under §49.04(d).
If you were arrested with a result between 0.08 and 0.15, see our guide on being arrested for DWI under 0.08 BAC in Texas for related issues.
How Is a 0.15 DWI Different From a Standard First DWI?
| Issue | Standard first DWI (Class B) | DWI with 0.15 or more (Class A) |
|---|---|---|
| Jail range | 72 hours minimum, up to 180 days | Up to 1 year |
| Maximum fine | $2,000 | $4,000 |
| Deferred adjudication | Available in many cases | Not available |
| Ignition interlock on probation | Discretionary for a first offense | Mandatory |
| State DWI fine after conviction | Generally $3,000 (first within 36 months) | Generally $6,000 |
| DWI nondisclosure after conviction | Possible after waiting period | Not available under §§411.0731 and 411.0736 |
Sources: Tex. Penal Code §49.04; Tex. Penal Code ch. 12; Tex. Code Crim. Proc. ch. 42A; Tex. Transp. Code §709.001; Tex. Gov't Code ch. 411.
What Are the Penalties for a 0.15 DWI in Texas?
Jail and fines
As a Class A misdemeanor, a first DWI with 0.15 or more is punishable by a fine of up to $4,000, confinement in jail for up to one year, or both (Tex. Penal Code §12.21). Many first-time cases are resolved with community supervision (probation), but the conditions are often stricter.
Mandatory ignition interlock
Under article 42A.408(c), when "an analysis of a specimen of the defendant's blood, breath, or urine showed an alcohol concentration level of 0.15 or more," the court must require an ignition interlock device on the vehicle you own or most regularly drive as a condition of community supervision (Tex. Code Crim. Proc. art. 42A.408). Our article on the ignition interlock breath testing device explains how these devices work.
The $6,000 state fine
Separate from the fine in the judgment, Transportation Code §709.001 imposes an additional fine on people "finally convicted" of a DWI-related offense. The amount is $6,000 "if it is shown on the trial of the offense that an analysis of a specimen of the person's blood, breath, or urine showed an alcohol concentration level of 0.15 or more" (Tex. Transp. Code §709.001). The statute contains exceptions, including for indigent defendants. For a broader look at expenses, see our guide to the real costs of a DWI in Texas.
No deferred adjudication
Texas allows deferred adjudication for many first DWI cases, which can avoid a final conviction. But article 42A.102(b)(1)(B) excludes cases in which, at the time of the offense, the defendant held a commercial driver's license or the defendant's "alcohol concentration... was 0.15 or more" (Tex. Code Crim. Proc. art. 42A.102). Our guide to DWI deferred adjudication in Texas explains how deferred works when it is available.
Record sealing limits
Texas allows nondisclosure (sealing) for some first-time DWI convictions after a waiting period. Sections 411.0731 and 411.0736 of the Government Code, however, apply only to a DWI "other than an offense punishable under Subsection (d)" of §49.04 (Tex. Gov't Code ch. 411). That makes the difference between a Class A and a Class B conviction especially important for your long-term record. Learn more in our article on DWI record sealing in Texas.
Driver's license consequences
A DWI arrest with a breath or blood test result of 0.08 or more also usually triggers an administrative license suspension through DPS, which is separate from the criminal case. You generally have only 15 days after notice to request a hearing; see our guide to the ALR hearing deadline.
Does the State Have to Prove the 0.15 Result at Trial?
Yes. In Navarro v. State, the Houston Fourteenth Court of Appeals held that a person's alcohol concentration level under §49.04(d) "is not a basis for enhancement" but "is instead an element of a separate offense," reasoning that it targets operating a motor vehicle with an especially high concentration of alcohol in the body (Navarro v. State). The Corpus Christi Court of Appeals agreed in Castellanos v. State, holding that subsection (d) "describes an element of a class A misdemeanor DWI, which the State has the burden to prove at the guilt/innocence stage" (Castellanos v. State).
Practically, this means:
- The charging document must allege the 0.15 element for a Class A charge.
- The jury decides, beyond a reasonable doubt, whether the test showed 0.15 or more.
- If the jury is not convinced on the 0.15 element, the case may result in a Class B conviction on the lesser offense, or an acquittal, depending on the evidence.
What Defenses Apply to a 0.15 DWI Charge?
Every case depends on its facts, but these issues often matter.
Whether the stop and arrest were lawful
If the officer lacked reasonable suspicion for the stop or probable cause for the arrest, evidence including the test result may be suppressed. Our article on refusing field sobriety tests discusses how roadside evidence is used.
Whether the blood draw was lawful
Blood is often drawn under a search warrant, especially on "no-refusal" weekends. Problems with the warrant affidavit or a warrantless draw can lead to suppression. The Fort Worth Court of Appeals has addressed these issues; see our discussion of a warrantless DWI blood draw held unconstitutional by a Fort Worth court.
Whether the test measured "blood" correctly
In Navarro, the court also held that "blood" in the statute means whole blood. A hospital result measured only from plasma or serum was not enough by itself to prove the 0.15 element (TDCAA case summary of Navarro). This can matter when the only test came from a hospital after a crash.
Whether the result is reliable
Breath tests depend on proper instrument maintenance, operator certification, and a required observation period. Blood tests depend on collection, storage, chain of custody, and laboratory procedures. A result close to 0.15 also raises questions about the measurement uncertainty of the test.
Rising blood alcohol and retrograde extrapolation
Because §49.04(d) measures the result "at the time the analysis was performed," the State does not need to extrapolate back to the time of driving to prove the 0.15 element itself. But a result taken long after driving can still matter to whether you were intoxicated while driving. The Court of Criminal Appeals in Mata v. State held that retrograde extrapolation "can be reliable in a given case," but that courts should consider the time between driving and the test, the number of tests, and what the expert knew about the person (Mata v. State, Tex. Crim. App. 2001).
What Should You Do After a 0.15 DWI Arrest in DFW?
- Request the ALR hearing within 15 days of receiving the notice of suspension.
- Write down a timeline while it is fresh: when you last ate, what you drank and when, when you were stopped, and when the test happened.
- Keep all paperwork, including the bond conditions, which may already require an interlock device.
- Avoid discussing the case with anyone other than your lawyer, including on social media.
- Ask a lawyer to request the test records, including breath instrument maintenance logs or blood lab data, and video from the stop and the jail.
- Do not assume a Class A charge cannot change. Whether the State can prove the 0.15 element is often a central question.
Frequently Asked Questions
Is a 0.15 DWI a felony in Texas?
No. A first DWI with a test result of 0.15 or more is a Class A misdemeanor. DWI becomes a felony in other situations, such as a third offense, a child passenger under 15, or causing serious bodily injury. See our guide on third DWI felony charges in Texas.
Can I get deferred adjudication for a 0.15 DWI?
Generally no. Article 42A.102 excludes DWI cases in which the defendant's alcohol concentration was 0.15 or more at the time of the offense, as well as cases involving a commercial driver's license or learner's permit holder.
Will I have to install an ignition interlock?
If you are placed on community supervision after a 0.15 finding, Texas law requires the court to order an ignition interlock device. Courts also frequently order interlocks as a bond condition while the case is pending.
Can a Class A DWI be reduced to a Class B?
It can happen. Whether a reduction is possible depends on the evidence, including the reliability of the test result, and the policies of the prosecutor's office. A reduction can affect deferred adjudication, the state fine, and nondisclosure eligibility.
Does refusing a breath test avoid a 0.15 charge?
Refusing a breath test means there may be no immediate result, but officers in DFW frequently seek a search warrant for blood, and refusal carries its own license suspension. If a blood test shows 0.15 or more, the Class A charge can still apply. See our article on no-refusal DWI in Texas.
Can a 0.15 DWI conviction be sealed?
Not under the DWI nondisclosure statutes that apply to convictions, which exclude offenses punishable under §49.04(d). This is one reason the Class A element is worth challenging carefully.
Talk to a Fort Worth DWI Lawyer
A 0.15 allegation changes almost every part of a DWI case, from probation conditions to fines and record sealing. Careful review of the test, the stop, and the timeline can make a meaningful difference.
Call HLAW at (817) 993-9249 or contact us online for a free consultation about your Dallas-Fort Worth DWI case.
This article is for general informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship. Laws change, and every case depends on its specific facts.






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