California DWI & DUI Laws
BAC limits, penalties, license suspension periods, and ignition interlock requirements for California drivers.
State Guide
California DUI Laws at a Glance
California calls impaired driving a DUI, and the standard illegal BAC threshold is 0.08%. What happens after an arrest, license suspension, whether an ignition interlock is required, how a prior offense counts against you, is set entirely by California law, and it differs meaningfully from other states.
| Detail | California Rule | Notes |
|---|---|---|
| Statutory Term | DUI | The specific offense name and code section vary by state |
| Standard BAC Limit | 0.08% | The standard threshold used in nearly every state |
| First-Offense License Suspension | 6 months | Administrative and criminal suspensions can run separately; actual length depends on case specifics |
| Ignition Interlock Device | Required | Required for all offenders, including first-time convictions |
| Lookback Period | 10 years | How many years a prior offense counts toward a repeat charge |
How BAC Testing and Implied Consent Work
BAC is measured through a breath, blood, or urine test under "implied consent" laws that exist in every state: driving on public roads counts as consent to testing when there's a lawful arrest for suspected impairment. Refusal triggers its own penalty, typically an automatic suspension, independent of the underlying DUI case.
License Suspension: Two Separate Tracks
A DUI arrest in California can trigger two separate tracks, an administrative suspension through the motor vehicle agency that moves quickly and independently of the courtroom process, and the criminal case itself. For a first offense, California's suspension period is 6 months.
Common Questions
Frequently Asked Questions: DUI in California
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What is the BAC limit in California?California's standard illegal BAC threshold is 0.08%. This matches the standard used in nearly every U.S. state. Commercial drivers and drivers under 21 face lower thresholds in every state, including California.
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How long is a license suspended for a first DUI offense in California?California's first-offense suspension period is generally 6 months. This can involve both an administrative suspension (handled by the state's motor vehicle agency, often starting soon after arrest) and consequences tied to the criminal case itself, which can run on a different timeline.
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Does California require an ignition interlock device?In California, an ignition interlock device is required for all offenders, including first-time convictions. Requirements can also depend on whether a high BAC was involved or whether it's a repeat offense.
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What does "DUI" mean in California?DUI is California's statutory term for operating a vehicle while impaired by alcohol or drugs above the legal threshold. Different states use different terms (DUI, DWI, OWI, OUI, OVI, and others) for what is fundamentally the same category of offense, though the exact legal definitions and penalty structures differ by state.
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What happens if I refuse a BAC test in California?Like every state, California has an implied consent law: refusing a lawfully requested BAC test after a DUI arrest triggers its own penalty, typically an automatic license suspension, separate from and in addition to any penalty from the underlying charge itself.
Sources & References
- National Highway Traffic Safety Administration, Drunk Driving official program overview
- Insurance Institute for Highway Safety, Alcohol Interlock Laws by State
- California BAC limit, suspension period, and interlock requirement figures compiled from published state-by-state legal reference tables; confirm current figures against official CA state code before relying on them
- Governors Highway Safety Association, Alcohol-Impaired Driving State Laws