Can You Drink and Drive in California? BAC Limits and Penalties

In California, you can be arrested for driving with a blood alcohol concentration (BAC) of 0.08% or higher, or for driving while impaired by alcohol, drugs, or any combination of the two, and California DUI laws and penalties scale quickly from a mandatory-jail first offense to a potential felony on a fourth conviction within ten years.¹ A conviction also triggers a separate license action through the DMV, with a short window to fight it that most drivers never hear about until it’s too late.

Two Ways You Can Be Charged

California’s DUI statute gives prosecutors two independent theories, and they often file both at once. The first is the “per se” rule: a BAC at or above the legal threshold is itself the crime, regardless of how well you were driving. The second is impairment: if your physical or mental abilities are affected enough that you can no longer drive with the caution of a sober person, you can be convicted even if your BAC comes back under the limit.¹

The law does not distinguish between legal and illegal substances. Prescription medication that affects your driving can produce the same charge as illegal drugs or alcohol.¹

BAC Limits by Driver Type

The number that counts against you depends on who you are and what you’re driving.

An underage driver who tests above 0.01% can face the underage violation and, if the BAC is high enough, a standard DUI charge on top of it.

First-Offense Penalties

A first DUI conviction in California is a misdemeanor and carries mandatory jail time. The sentence ranges from 96 hours (with at least 48 of them continuous) up to six months in county jail, with a base fine of $390 to $1,000.³ The DMV will suspend your license, and the court can block a restricted license if it decides you’d be a safety risk.

You’ll also be placed on probation for three to five years. The court can order an ignition interlock device for up to six months, or you can install one voluntarily to qualify for a restricted license that lets you drive anywhere rather than only to work and your DUI program.⁴

Second, Third, and Fourth Offenses

California counts prior DUI and wet-reckless convictions within a 10-year lookback. Each repeat conviction inside that window raises the floor.

Second Offense

At least 90 days in county jail, up to one year, with the same $390 to $1,000 base fine. A longer license suspension applies, and an ignition interlock device is mandatory for 12 months.⁵⁴

Third Offense

At least 120 days in county jail, up to one year, with the same base fine. Your license is revoked rather than suspended, and you’ll be designated a “habitual traffic offender” for three years, which makes driving on the revoked license a separate serious crime. Interlock is mandatory for 24 months.⁶⁴

Fourth Offense

A fourth DUI within 10 years is a felony. The court can impose state prison, or county jail for 180 days to one year, plus the base fine. The license revocation and three-year habitual traffic offender label apply, and interlock is mandatory for 36 months.⁷⁴ A felony conviction carries weight far beyond the sentence, following you into job applications, professional licensing, and housing decisions.

DUI Causing Injury

If you drive impaired and your driving causes bodily injury to someone else, it becomes a separate charge. The offense requires that you were impaired or over the BAC limit, that you also violated some other traffic law or duty of care, and that the violation directly caused another person’s injury.⁸

This is a “wobbler” that prosecutors can charge as either a misdemeanor or a felony depending on injury severity and your record. A felony conviction can mean up to four years in state prison, fines up to $5,000, license revocation for up to five years, and restitution to injured parties. If anyone suffers great bodily injury, the conviction counts as a strike under California’s three-strikes law. Interlock is mandatory for 12 months on a first DUI-with-injury conviction.⁴

What a Conviction Actually Costs

The headline $390 fine is misleading. California stacks mandatory penalty assessments, surcharges, and fees on top of every criminal fine. For a first-offense misdemeanor DUI at the $390 minimum, the total runs around $2,020.⁹ A higher base fine pushes everything up proportionally because most add-ons are calculated as multipliers.

Then come the ongoing costs. A court-ordered DUI education program typically runs several hundred dollars, with length depending on your BAC and offense history. Defense attorneys commonly charge from $2,500 up through five figures for contested cases. An ignition interlock device carries installation and monthly monitoring fees for the entire required period.

After the conviction, California requires an SR-22 certificate proving liability coverage, which you must maintain for three years. Insurance premiums spike as a result, with industry estimates putting the typical California increase at roughly 80% to 180%. Over several years, the insurance hit alone often exceeds every other cost combined.

Refusing a Chemical Test

By driving in California, you’ve given implied consent to a chemical test after a lawful DUI arrest.¹⁰ Refusal after arrest triggers automatic administrative penalties independent of what happens in criminal court:¹¹

First refusal: at least one year of license suspension.
With one prior DUI or refusal in 10 years: two years.
With two or more priors: three years.

A refusal can be used against you in court, and if you’re convicted, it triggers enhanced penalties including additional mandatory jail time.¹⁰

The 10-Day DMV Deadline

A DUI arrest triggers two separate proceedings. One is the criminal case in court. The other is an administrative license suspension by the DMV, and you have only 10 days from the date of arrest to request a hearing to challenge it.¹²

Miss that window and the suspension kicks in automatically, typically 30 days after arrest. Winning the criminal case later does not undo the DMV suspension, because the two proceedings use different rules and different burdens of proof. The DMV hearing is the only chance to fight the administrative action, and most drivers lose it by not knowing the deadline exists.

Ignition Interlock Devices

An ignition interlock device is a breathalyzer wired into the car’s ignition. You blow into it before the engine will start, and periodically while driving. Alcohol prevents the start or logs a violation. The device must be serviced by the installer at least every 60 days for recalibration, and tampering is reported to the court.¹³

Required installation periods are set by offense count: up to six months on a first offense (discretionary, or voluntary for a broader restricted license), 12 months on a second, 24 months on a third, and 36 months on a fourth or later offense.⁴

Probation and the Zero-Tolerance Rule

Nearly every DUI conviction comes with three to five years of probation.¹⁴ The condition that trips people up: for the entire probation period, you cannot drive with any measurable amount of alcohol in your blood. Not 0.08%, not 0.02%, zero. A single drink before driving can produce a probation violation on top of any new charge.

Standard conditions also include completing a DUI education program, paying all fines and restitution, and committing no new offenses. A violation can push the court to impose the maximum jail sentence it originally suspended in granting probation.

1
California Legislative Information. California Code VEH 23152 – Offenses Involving Alcohol and Drugs
2
California Legislative Information. California Code VEH 23136 – Offenses by Persons Under 21 Years of Age Involving Alcohol
3
California Legislative Information. California Code VEH 23536 – First Offense Penalties
4
California Legislative Information. California Code VEH 23575.3 – Ignition Interlock Device Requirements
5
California Legislative Information. California Code VEH 23540 – Second Offense Penalties
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California Legislative Information. California Code VEH 23546 – Third Offense Penalties
7
California Legislative Information. California Code VEH 23550 – Fourth Offense Penalties
8
California Legislative Information. California Code VEH 23153 – DUI Causing Bodily Injury
9
California Legislative Analyst’s Office. Overview of Criminal Fine and Fee System
10
California Legislative Information. California Code VEH 23612 – Chemical Testing
11
California Legislative Information. California Code VEH 13353 – Refusal Suspension Periods
12
California Department of Motor Vehicles. Driving Under the Influence (DUI)
13
California Legislative Information. California Code VEH 23575 – Ignition Interlock Device Program
14
California Legislative Information. California Code VEH 23600 – DUI Probation