Oregon DUII BAC Limit and Breathalyzer Results

Oregon's BAC Thresholds

Oregon has different BAC thresholds and rules that trigger different legal consequences:

0.08% — Standard DUII threshold. Any driver 21 or older operating a non-commercial vehicle with a BAC at or above 0.08% is legally intoxicated under ORS 813.010. This is the number that triggers a first-offense DUII charge and a 90-day administrative license suspension.

0.04% — Commercial vehicle threshold. CDL holders operating a commercial motor vehicle face the federal 0.04% standard. A BAC between 0.04% and 0.079% in a commercial vehicle results in a 24-hour out-of-service order and can trigger a DUII charge.

Under 21 — separate rules. Under-21 drivers are subject to separate license rules; do not assume the adult 0.08% rule controls every underage case.

What Your Breathalyzer Number Means for Penalties

Your specific BAC reading doesn't just determine whether you're charged — it affects the severity of penalties if you're convicted:

BAC 0.08%–0.14%: Standard first-offense range. You're eligible for the DUII Diversion Program (assuming no other disqualifiers), and the mandatory minimum fine on conviction is $1,000. The administrative suspension is 90 days with a 30-day wait for a hardship permit.

BAC 0.15% or higher: Oregon imposes enhanced penalties. The mandatory minimum fine doubles to $2,000 on conviction. Courts frequently impose stricter supervision conditions, and some counties require extended treatment programs. The administrative track penalties remain the same (the DMV doesn't distinguish between 0.08% and 0.25% — it's pass or fail), but the criminal side gets meaningfully worse.

Breath Test vs. Blood Test

The arresting officer typically administers a breath test using a calibrated Intoxilyzer instrument at the station. This is the evidentiary test — the roadside portable breath test (PBT) used during the traffic stop is a screening tool and isn't admissible as evidence of your BAC in court.

In some situations, particularly when drugs are suspected or the officer believes the breathalyzer result is unreliable, they may request a blood draw or urine test. Blood tests are generally more accurate than breath tests and are harder to challenge.

The critical thing to understand: you can challenge the accuracy of a breath test at your DMV hearing and in court. Calibration records, operator certification, and testing protocol all matter. A blood test leaves less room for these challenges.

The IID Connection

Once you're in diversion or post-conviction, your Ignition Interlock Device operates at a different threshold: 0.021% BrAC. That's roughly one sip of beer. A startup reading at or above 0.021% BrAC can count as a violation and reset your compliance clock unless a subsequent test within ten minutes is below 0.021% and the device's camera confirms the same person provided both samples. A failed random retest or missed retest can also reset the clock. It's not the same as the legal limit — it's an abstinence-monitoring threshold designed to flag any alcohol consumption at all.

Refusing the Test vs. Failing It

Some drivers assume that refusing the breathalyzer is a better strategy than providing a high BAC result. In Oregon, that calculation almost always works against you. A test refusal triggers a one-year suspension instead of 90 days, a $650 civil fine, and the prosecution can tell the jury you refused because you knew you'd fail. Read more about the full refusal consequences.

What Comes Next

Your BAC number is one data point in a larger process. Whether you tested at 0.09% or 0.19%, the immediate priority is the same: file your DMV hearing request within the applicable 10-day deadline and prepare for your first court appearance.

Our Oregon First-Offense DUI Guide walks through how your specific BAC affects your diversion eligibility, penalty exposure, and strategic decisions across both the administrative and criminal tracks.

See more Oregon guides →