First Offense DWI in Texas — Penalties, Jail Time & What to Expect

If you were arrested for DWI for the first time in San Antonio and want to know whether you are going to jail — the honest answer is that it depends significantly on how the case is handled from here. A first-offense DWI in Texas carries mandatory minimum jail time in the statute, but whether that time is served in a county jail, satisfied through a combination of jail credit and probation conditions, or avoided entirely through dismissal or acquittal depends on the specific facts of your case, the strength of the state’s evidence, and the decisions your attorney makes from the first day.

This post explains exactly what the law requires for a first-offense DWI conviction in Texas, what the realistic range of outcomes looks like in Bexar County courts, and what the most important decisions are in the weeks following an arrest.

The Statutory Penalties for a First-Offense DWI in Texas

A first-offense DWI in Texas without aggravating factors is a Class B misdemeanor under Texas Penal Code Section 49.04. The statutory penalty range is a fine of up to $2,000, confinement in county jail for not less than 72 hours and not more than 180 days, or both. The 72-hour minimum is mandatory — unlike many criminal offenses where probation can be granted with no jail time, a DWI conviction in Texas requires at least 72 hours of confinement. This minimum increases to six days if an open container of alcohol was present in the vehicle at the time of the arrest.

A first-offense DWI is elevated to a Class A misdemeanor — with a fine of up to $4,000 and up to one year in county jail — when the defendant’s blood alcohol concentration was 0.15 or higher at the time of the offense. The 0.15 threshold is the line between a Class B and Class A first-offense DWI, and it triggers additional consequences including the mandatory ignition interlock device condition on any community supervision.

What Community Supervision Actually Means for a First DWI

In practice, most first-offense DWI convictions in Bexar County do not result in the defendant going to a county jail to serve the 180-day maximum sentence. The more common outcome for a first offense — when a plea is entered — is a plea to the DWI charge with a sentence of 180 days confinement in county jail, suspended in favor of community supervision — probation — for a period of twelve to twenty-four months, with credit for any time already served in jail from the original arrest.

The 72-hour minimum confinement requirement is typically satisfied by the time already spent in custody between arrest and release on bond. A defendant who was held in custody for 72 hours or more before posting bond has already served the statutory minimum as a practical matter, and that time is credited against the sentence.

Community supervision for a first DWI typically includes reporting to a supervision officer monthly, paying supervision fees and court costs, completing DWI education and impact panel programs, not consuming alcohol or controlled substances, submitting to random drug and alcohol testing, completing community service hours, and — if the BAC was 0.15 or higher — installing an ignition interlock device in any vehicle operated. The supervision period and specific conditions vary by court and by negotiated plea terms.

The permanent consequence of this outcome is a DWI conviction on the criminal record. As discussed in detail in a separate post on this site, a DWI conviction in Texas is permanent — there is no expungement for DWI convictions and no deferred adjudication available for DWI charges. Every plea to a DWI charge is a conviction that will appear on background checks indefinitely.

The Outcomes That Avoid a Conviction Entirely

The most important thing to understand about a first-offense DWI case is that a plea resulting in a conviction is not the only possible outcome. Outcomes that do not result in a conviction — and that may allow the arrest record to be expunged — are available in a meaningful percentage of DWI cases when the defense is handled effectively from the outset.

• A dismissal occurs when the state cannot prove its case — typically because a motion to suppress evidence was granted, because the state’s evidence is insufficient, or because the prosecutor exercises discretion to dismiss a case with significant evidentiary problems. When a DWI is dismissed, the defendant is not convicted, and after the applicable statute of limitations period the arrest record can be expunged — destroyed entirely — so it never appears on background checks.
• An acquittal at trial — a not-guilty verdict from a jury — produces immediate expungement eligibility. A defendant who takes a DWI case to trial and is acquitted walks out of the courthouse with the right to have every record of the arrest destroyed.
• A charge reduction — where the DWI is dismissed and the defendant pleads to a lesser offense such as obstruction of a highway or reckless driving — does not result in a DWI conviction. The lesser offense conviction has its own consequences but is generally less severe than a DWI conviction in terms of professional licensing, insurance rates, and long-term record impact. The DWI arrest may also be expungeable even when a plea is entered to a lesser charge — an attorney can evaluate the specific facts to determine expungement eligibility.

These non-conviction outcomes are not available in every case — they depend on the specific facts of the arrest, the evidence gathered, and whether viable defense arguments exist. But they are available in a meaningful number of DWI cases that are investigated and challenged aggressively from the first day, and the difference between a dismissed DWI and a DWI conviction is the difference between an expungeable arrest and a permanent record.

The Defense Analysis for a First-Offense DWI Case

Every first-offense DWI defense begins with the same systematic factual review that can identify whether viable suppression arguments or trial defenses exist.

• The traffic stop. Was the stop supported by reasonable suspicion of a traffic violation or criminal activity? An officer who initiated a stop without legal justification has conducted an unlawful seizure under the Fourth Amendment. If the stop was unlawful, a motion to suppress can eliminate every piece of evidence gathered after the stop — including the field sobriety tests, the officer’s observations, and any breath or blood test result. Without that evidence, the state has no DWI case.
• Field sobriety tests. The National Highway Traffic Safety Administration has established standardized protocols for the three validated field sobriety tests — the Horizontal Gaze Nystagmus test, the Walk and Turn test, and the One Leg Stand test. Officers are required to administer these tests according to NHTSA standards for the results to be reliable. Deviations from the standardized procedure — an uneven surface, inadequate lighting, improper demonstration, failure to screen for medical conditions that affect performance — are grounds to challenge the reliability and admissibility of the test results.
• Breath test results. The Intoxilyzer 9000 is the approved breath testing device in Texas. Its accuracy depends on regular calibration and maintenance by certified personnel. Defense attorneys subpoena the maintenance logs, calibration records, and operator certification documentation for the specific device used in every breath test DWI case. Gaps in the maintenance records, operator certification failures, or deviations from the required testing protocol can challenge the reliability of the breath test result and provide grounds for suppression or for cross-examination that undermines the weight of the result at trial.
• Blood test results. When blood was drawn — either voluntarily, pursuant to a search warrant, or under mandatory draw circumstances — the chain of custody, laboratory procedures, analyst qualifications, and testing methodology are all subject to challenge. Defense attorneys request the complete laboratory file, including the analyst’s notes, the instrument maintenance records, and the quality control documentation, to identify any issues with the collection, storage, or analysis of the blood sample.
• The officer’s observations. In cases where the breath or blood test result is challenged, the state’s remaining evidence is the arresting officer’s subjective observations — driving behavior, physical appearance, odor of alcohol, speech, balance, and performance on field sobriety tests. These observations are documented in the written arrest report, captured on body camera footage, and in some cases captured on dash camera footage. Inconsistencies between the written report and the video footage — or between the officer’s testimony at the ALR hearing and their testimony at trial — are powerful impeachment material that experienced DWI defense attorneys identify and use.

The decision about whether to negotiate a plea, pursue a suppression motion, or take the case to trial cannot be made responsibly without reviewing all of this evidence. An attorney who enters plea negotiations without reviewing the maintenance records for the breath testing device, without watching the body camera footage, and without analyzing the legality of the traffic stop is negotiating from a position of incomplete information — and is more likely to accept a plea that could have been avoided.

The single most important decision after a first DWI arrest in San Antonio is how quickly and how thoroughly you engage legal representation. Evidence is preserved when it is requested early. The ALR hearing must be requested within 15 days. The factual record of the arrest is most complete in the days immediately following — before memories fade, before footage is overwritten, and before the other side has fully developed its case.

If you were arrested for DWI for the first time in San Antonio or Bexar County, call Barton & Associates at 210-500-0000. Consultations are free, confidential, and available 24 hours a day. We will review the specific facts of your case and tell you honestly what your options are.