What Is the DUI Limit in Utah?

Utah has the lowest blood alcohol concentration (BAC) limit in the United States at 0.05% for most drivers, well below the national standard of 0.08%. Commercial drivers face a 0.04% limit, and for drivers under 21, a zero tolerance law makes any measurable amount of alcohol a violation under Utah Code 41-6a-530.

Last updated: July 2026

Utah made history in December 2018 when it became the first and only state to lower its BAC limit to 0.05%. The change was driven by a goal to reduce fatal crashes and alcohol related fatalities. While the national standard remains 0.08% for DUI per se offenses, Utah’s stricter threshold has made an impact on the state’s roadway safety statistics. Understanding the DUI limit in Utah requires looking at the specific BAC levels that apply to different driver categories, the legal implications of exceeding those limits, and what the law says about impairment beyond the numbers on a chemical test.

The legal limit is not just a number. It represents the point at which the state presumes a driver is under the influence of alcohol to a degree that makes operating a vehicle unsafe. In Utah, that presumption starts at 0.05%. Even if a driver shows no visible signs of intoxication, a BAC at or above 0.05% can lead to a DUI charge under Utah Code 41-6a-502. This is known as a “per se” DUI, meaning the BAC itself constitutes the violation.

What Is the BAC Limit for Most Drivers in Utah?

For drivers 21 and older operating a non-commercial vehicle, the legal BAC limit in Utah is 0.05%. This applies to all drivers on public roadways. If a chemical test shows a BAC of 0.05% or higher, the driver can be charged with driving under the influence under Utah Code 41-6a-502. It is important to note that a driver can also be convicted of DUI with a BAC below 0.05% if there is other evidence of impairment, such as poor driving, slurred speech, or failed field sobriety tests. The 0.05% limit functions as a bright line for per se violations, but it does not replace the broader prohibition against driving while impaired.

The Utah Department of Transportation has published data showing that even at 0.05% BAC, a driver experiences reduced coordination, slower reaction times, and difficulty tracking moving objects. These effects increase crash risk substantially. By setting the limit at 0.05%, Utah aimed to prevent crashes before drivers reach the more dangerous levels of impairment seen at 0.08% and above.

What Is the BAC Limit for Commercial Drivers in Utah?

Commercial drivers in Utah face a stricter BAC standard. Under Utah law and federal regulations, commercial motor vehicle operators are prohibited from driving with a BAC at or above 0.04%. This lower threshold reflects the increased responsibility that comes with operating large trucks, buses, and vehicles carrying hazardous materials. A commercial driver who is convicted of DUI at any BAC level faces disqualification of their commercial driver’s license (CDL) and potential employment consequences.

The 0.04% standard applies when the driver is operating a commercial vehicle. If a commercial driver is off duty and driving a personal vehicle, the standard 0.05% limit applies instead. However, a DUI conviction in a personal vehicle can still affect a CDL holder’s commercial driving privileges. Under federal regulations, a commercial driver must notify their employer of any DUI conviction within 30 days.

What Is the Zero Tolerance BAC Limit for Drivers Under 21 in Utah?

Utah enforces a zero tolerance law for drivers under the age of 21. Under Utah Code 41-6a-530, it is illegal for any person under 21 to operate a vehicle with any measurable amount of alcohol in their body. Unlike the 0.05% standard for adults, zero tolerance means that even a BAC of 0.01% or 0.02% can result in penalties. These penalties typically include a license suspension and fines, even if the underage driver does not face a full DUI charge.

The zero tolerance offense is separate from a regular DUI charge. A driver under 21 can be charged with both zero tolerance violations and a standard DUI if their BAC exceeds 0.05% or if they show signs of impairment. The consequences for an underage DUI conviction are severe and can include license suspension, fines, mandatory education programs, and potential jail time. For drivers under 18, the penalties can affect driving privileges well beyond age 21.

How Is BAC Measured in a Utah DUI Stop?

When a driver is stopped on suspicion of DUI in Utah, law enforcement typically uses field sobriety tests and a preliminary breath test (PBT) at the roadside. The PBT gives officers a preliminary BAC reading that helps establish probable cause for an arrest. After arrest, the driver is asked to submit to a chemical test under Utah’s implied consent law. This test is usually a breath test using a DatMaster device, though blood and urine tests are also authorized under certain circumstances.

The chemical test results are admissible as evidence in court. If the test shows a BAC at or above 0.05%, the prosecution can use that result to establish a per se DUI violation. The state does not need to prove that the driver was actually impaired if the BAC equals or exceeds the legal limit. However, defendants can challenge the accuracy of the test through motions addressing calibration records, operator certification, and chain of custody.

What Happens If You Exceed the DUI Limit in Utah?

Exceeding the DUI limit in Utah triggers criminal charges that carry escalating penalties. A first DUI offense with a BAC of 0.05% or higher is generally a class B misdemeanor. Penalties can include up to six months in jail, fines up to $1,300, a 120-day license suspension, mandatory alcohol screening, and installation of an ignition interlock device. If the BAC is 0.16% or higher, the penalties increase significantly. A second offense within 10 years is a class B misdemeanor with mandatory jail time of at least 48 hours. A third offense within 10 years is a third degree felony.

Beyond the criminal penalties, a DUI conviction carries administrative consequences. The Utah Driver License Division (DLD) handles license suspensions separately from the court case. A driver who refuses a chemical test faces an automatic 18-month license revocation for a first refusal. Even if the criminal case is resolved favorably, the administrative suspension can still take effect. You can learn more about license consequences through the Utah DLD DUI information page.

Why Did Utah Choose 0.05% Instead of 0.08%?

Utah chose the 0.05% limit based on traffic safety research and the recommendation of the National Transportation Safety Board (NTSB). The NTSB has advocated for a 0.05% national BAC standard since 2013, citing studies that show impairment begins well before 0.08%. At 0.05%, a driver’s risk of being in a fatal crash is significantly elevated compared to a sober driver. Utah legislators determined that reducing the limit would deter drinking and driving and save lives. The National Highway Traffic Safety Administration (NHTSA) has also supported lower BAC limits as part of a comprehensive approach to reducing alcohol impaired driving fatalities.

The decision was not without controversy. Hospitality industry groups opposed the change, arguing that it would hurt tourism and unfairly penalize moderate drinkers. However, data collected since the law took effect shows that Utah’s traffic fatalities dropped notably in the first few years after implementation. The state has become a case study for other states considering similar legislation.

One aspect that sets Utah apart is how the 0.05% limit interacts with the state’s impaired driving statute. Under Utah Code 41-6a-502.5, a driver with a BAC between 0.05% and 0.08% who does not show significant impairment can sometimes be charged with impaired driving rather than DUI. This is a less serious offense, but it still carries penalties and appears on a criminal record. The impaired driving charge functions as a compromise in cases where the BAC is only slightly over the limit and there are no aggravating factors.

Can You Be Convicted of DUI Below 0.05% in Utah?

Yes. The 0.05% limit is a per se threshold, meaning that exceeding it automatically establishes a DUI violation. But Utah Code 41-6a-502 also prohibits driving while under the influence of alcohol or drugs to the degree that the driver cannot safely operate a vehicle. A driver with a BAC below 0.05% can still be convicted if the prosecution presents evidence of impairment through officer observations, dash camera footage, failed field sobriety tests, or erratic driving. This is sometimes called a “impairment based” DUI as opposed to a “per se” DUI.

For drivers who are under the influence of drugs (including prescription medication) rather than alcohol, the BAC limit is irrelevant. Utah’s drugged driving laws apply regardless of BAC. The prosecution must prove that the driver’s ability to safely operate a vehicle was impaired due to the drug. This includes prescription drugs, over-the-counter medications, and illegal substances.

Understanding Utah’s DUI limit is essential for anyone who drives in the state. The 0.05% threshold is stricter than anywhere else in the country, and the consequences of exceeding it can be severe. Whether you are a resident or a visitor, knowing the law and planning ahead can help you avoid a life altering DUI charge. If you are facing a DUI in Utah, working with a defense attorney who understands the nuances of Utah’s BAC laws can make a significant difference in your case.

About the Author: Daniel Banks is a legal content strategist who writes about Utah criminal defense, DUI law, and personal injury law. His work helps individuals facing criminal charges understand their legal rights and options under Utah law.

This article is for informational purposes only and does not constitute legal advice. Consult with a qualified Utah criminal defense attorney for advice specific to your situation.