WA SB5664

Lowers Washington's per se blood alcohol concentration (BAC) limit for driving under the influence from 0.08 to 0.05, effective July 1, 2026

Creates tiered penalty thresholds at 0.05, 0.10, and 0.12 BAC levels, with escalating fines and mandatory minimum jail times based on alcohol concentration and prior offenses

Reduces the lookback period for counting prior DUI offenses from 15 years to 10 years when determining felony-level charges for repeat offenders

Requires the Washington Traffic Safety Commission to develop a multilingual public information campaign about the new law, including outreach in the top nine non-English languages spoken in the state

Mandates the Washington State Institute for Public Policy to evaluate the law's impact on traffic crashes, DUI arrests, hospitality industry effects, and equity outcomes, with a report due by March 1, 2029