Washington DUI laws set the BAC limit at 0.08% for adult drivers and 0.00% for drivers under 21. A first offense can bring up to 364 days in jail and fines up to $5,000. Washington law also allows conviction when a driver is affected by alcohol or drugs even under the numeric limit. This guide covers penalties, license suspension, implied consent, and the felony threshold. Rules come from the Revised Code of Washington Title 46, Chapter 46.61.
What Counts as DUI in Washington
Washington law defines driving under the influence through several distinct legal paths rather than a single test. A person can be convicted for having a BAC of 0.08% or higher, for having a THC concentration of 5.00 nanograms per milliliter or higher, or for being under the influence of or affected by alcohol or drugs regardless of the exact number. This means a driver testing under the numeric limit can still face charges if their driving or behavior shows impairment. These standards appear in Washington RCW 46.61.502, driving under the influence statute.
The “affected by” standard is often misunderstood. Many drivers assume that staying under 0.08% guarantees they cannot be charged with DUI. Washington law does not work that way. An officer or prosecutor can pursue a charge based on observed impairment, unsafe driving, or performance on field sobriety tests, separate from any breath or blood test result. This dual structure gives prosecutors two independent routes to a conviction.
Key Terms Defined
A per se limit is the exact number, such as 0.08% BAC, at which a driver is automatically considered impaired under the law regardless of how they appear to be acting. Implied consent means that by choosing to drive on Washington roads, a person has already agreed in advance to take a breath or blood test if lawfully arrested for suspected DUI. These two concepts work together throughout the DUI process, from the roadside stop through any later administrative hearing.
A gross misdemeanor is a criminal charge level in Washington that is more serious than a regular misdemeanor but less serious than a felony, carrying up to 364 days in jail. Most first, second, and third DUI offenses are charged as gross misdemeanors. A felony DUI carries substantially longer potential incarceration and applies only once a driver meets specific prior offense thresholds set by statute, discussed later in this guide.
Penalties for a First Offense
A first offense DUI in Washington is typically charged as a gross misdemeanor. Penalties may include jail time, fines, and license action, with the exact minimums depending on the BAC level at the time of arrest. A person convicted may face a fine and a mandatory minimum jail term or, in some cases, electronic home monitoring in place of jail. The full schedule appears in Washington RCW 46.61.5055, alcohol and drug violators penalty schedule.
Fines for a first offense may reach up to $5,000 depending on the circumstances of the case. Courts may also require installation of an ignition interlock device, which is a breath testing device installed in a vehicle that prevents the engine from starting if it detects alcohol on the driver’s breath. This requirement typically applies even to first time offenders and adds an ongoing compliance obligation beyond the criminal sentence itself.
Penalties With Prior Offenses
Penalties increase with each prior offense counted within the applicable lookback period. A second offense generally carries a longer mandatory minimum jail term and higher fines than a first offense, while a third offense increases these consequences further. Each tier under Revised Code of Washington Section 46.61.5055 sets its own minimum jail time, minimum fine, and license consequences based on the number of prior offenses and the BAC level at arrest.
The prior offense lookback period is the number of years the court looks back to count earlier DUI related convictions when deciding the penalty level. Effective January 1, 2026, this lookback period for the felony DUI threshold was extended from ten years to fifteen years. Drivers with convictions in the past should understand that the felony threshold now reaches further back than it did before this date.
Felony DUI Thresholds
A DUI becomes a felony in Washington once a driver has three or more prior offenses within the applicable lookback period, or under certain circumstances involving related prior felony convictions. Effective January 1, 2026, that lookback period is fifteen years, up from the previous ten year period. This change means more repeat offenders now qualify for felony level charges than under the prior version of the statute. The current and prior versions both appear in Washington RCW 46.61.5055, alcohol and drug violators penalty schedule.
Prior convictions for related offenses, including vehicular homicide under Revised Code of Washington Section 46.61.520 and vehicular assault under Revised Code of Washington Section 46.61.522, can also factor into the felony threshold calculation. A felony DUI carries substantially more severe potential penalties than a gross misdemeanor, including longer incarceration exposure. Laws and enforcement may change, so drivers should check official state sources for the latest rules.
Ignition Interlock and Minor Passenger Rules
Washington courts frequently require an ignition interlock device as a condition of license reinstatement or as part of sentencing following a DUI conviction. This device requires the driver to pass a breath test before the vehicle will start, and it may also require periodic retests while driving. The length of the required interlock period generally increases with each prior offense, consistent with the broader penalty escalation set out in the statute.
Washington law also includes an enhanced penalty when a minor under 16 years old was a passenger in the vehicle at the time of the offense. This enhancement adds to the base penalty a driver would otherwise face for the underlying DUI charge. The presence of a minor passenger is treated as an aggravating factor that courts may weigh separately from the standard penalty schedule.
Criminal Court License Suspension
A DUI conviction in criminal court can result in a license suspension or revocation ordered directly by the court as part of sentencing. This suspension is separate from any action taken by the Department of Licensing and follows from the criminal conviction itself. The length of a court ordered suspension generally corresponds to the offense tier under Revised Code of Washington Section 46.61.5055, increasing with prior offenses and higher BAC levels.
Separate DOL Administrative Suspension
Washington also imposes a separate administrative license suspension through the Department of Licensing, independent of the criminal case outcome. This process is triggered by implied consent, the legal idea that a driver has already agreed to chemical testing if lawfully arrested for suspected DUI. A failed or refused test can trigger this administrative suspension even before, or regardless of, any criminal conviction. The suspension lengths are set out in Washington RCW 46.20.3101, implied consent license sanctions.
Winning or resolving the criminal case does not automatically restore a license suspended through this administrative process. These are two distinct legal tracks that can both affect the same driver from the same arrest, operating on different timelines and requiring separate responses. A driver facing both a criminal charge and an administrative suspension typically must address each process on its own terms.
Test Refusal Consequences
Refusing a breath or blood test does not avoid a DUI charge in Washington. Instead, refusal triggers separate and often longer administrative license consequences than a failed test would produce. Officers are required to warn drivers about these consequences under the implied consent procedures described in Washington RCW 46.20.308, implied consent test refusal procedures. A driver can still be prosecuted for DUI using other evidence even after a refusal.
The refusal itself may also be used as evidence in the criminal case. Because implied consent means a driver has already agreed in advance to testing when lawfully arrested, refusal is treated as a separate violation of that agreement rather than a way to avoid legal exposure. Consult a licensed attorney in your state for guidance specific to a refusal situation, since procedural deadlines apply.
Affirmative Defenses
An affirmative defense is a legal argument the accused person must prove themselves, rather than something the prosecutor has to disprove. Washington DUI law allows certain affirmative defenses depending on the facts of the case. Because the accused carries the burden of proof for an affirmative defense, this differs from the general rule that prosecutors must prove guilt beyond a reasonable doubt for the underlying charge itself.
Oral Fluid Roadside Test
Effective January 1, 2026, Washington authorizes a new voluntary oral fluid roadside test for suspected drug impairment. This test is optional, meaning a driver cannot be penalized under implied consent for declining it the way they could for declining a formal breath or blood test. The rule appears in Washington RCW 46.61.5062, oral fluid roadside test statute.
Results from this roadside oral fluid test may not be used as evidence against a person in court. It functions only as a screening tool to help officers assess potential impairment at the scene, separate from the formal chemical tests used to build a criminal case. Drivers should not assume this new test carries the same evidentiary weight as a station administered breath or blood test.
Common Misconceptions
Many drivers believe that testing under 0.08% BAC means they are automatically safe from a DUI charge. Washington law rejects this assumption through the “affected by” standard, which allows conviction based on observed impairment independent of the numeric result. A driver can be under the per se limit and still face a valid charge if evidence shows their ability to drive was affected by alcohol or drugs.
Another common misconception is that refusing a breathalyzer avoids DUI consequences entirely. In reality, refusal triggers its own administrative license consequences under implied consent and does not prevent prosecution using other evidence. This article explains general Washington DUI rules only and does not address any individual case, as described further in the site Disclaimer.
Disclaimer
This article is for general informational purposes only. It is not legal advice. Lawwalls publishes informational content only and does not provide legal services or legal advice.
For legal advice about your specific situation contact a licensed attorney in your state. Laws change and vary by jurisdiction. Verify current rules with official government sources or a qualified lawyer.