The California BAC limit depends on the driver and the type of driving involved. For most drivers age 21 and older, the BAC limit is 0.08%, but lower limits of 0.01%, 0.04%, or 0.05% apply in certain circumstances, including to drivers under 21, commercial drivers, passenger-for-hire drivers, and people on DUI probation.
California law does not establish a specific number of drinks that a person can have before driving. BAC can vary significantly from person to person, and a driver may face a DUI charge even with a BAC below 0.08% if alcohol has impaired their ability to drive.
What Is the California BAC Limit?
California has different BAC limits depending on the driver’s circumstances.
| BAC limit | California Vehicle Code | Applies to |
|---|---|---|
| 0.08% | VC § 23152(b) | Generally, drivers with a BAC of 0.08% or higher |
| 0.01% | VC § 23136 | Drivers under 21 under California’s zero-tolerance law |
| 0.05% | VC § 23140 | Drivers under 21 with a BAC of 0.05% or higher |
| 0.04% | VC § 23152(d) | Drivers operating a qualifying commercial motor vehicle |
| 0.04% | VC § 23152(e) | Drivers operating a vehicle with a passenger for hire |
| 0.01% | VC § 23154 | Drivers who are on DUI probation |
For most people, the number they hear most often is 0.08%. However, that is not the applicable BAC threshold for every California driver.
What Is the Legal BAC Limit for Most Drivers in California?
For most drivers age 21 and older, the California BAC limit is 0.08%.
Under California Vehicle Code § 23152(b), it is unlawful to drive a vehicle with a BAC of 0.08% or higher.
This is commonly called California’s per se DUI law because the statute establishes a specific BAC threshold.
However, California also separately prohibits driving while under the influence of alcohol under Vehicle Code § 23152(a).
That means 0.08% is not a guaranteed line between legal and illegal driving.
Can You Get a DUI With a BAC Below 0.08%?
Yes. A driver can potentially face a DUI charge with a BAC below 0.08%.
California’s DUI law separately prohibits driving while under the influence of alcohol. A person does not necessarily have to reach 0.08% BAC for alcohol-related impairment to become a legal issue.
For example, suppose a driver’s BAC is 0.06%. That is below the standard 0.08% threshold, but the driver could still face a DUI allegation if other evidence indicates that alcohol impaired their ability to drive safely.
The key distinction is:
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0.08%: The standard statutory BAC threshold for most adult drivers.
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Impairment: Driving under the influence can be unlawful even below 0.08%.
How Many Drinks Can You Have Before Driving in California?
There is no specific number of drinks that California law says every driver can consume before driving.
BAC depends on factors such as:
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Body weight and composition
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Sex
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How quickly alcohol is consumed
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Whether the person has eaten
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The amount and strength of the alcohol consumed
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How much time has passed
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Individual differences in alcohol metabolism
For example, two people can each have two drinks and reach different BAC levels.
Therefore, statements such as “two drinks is legal” or “three drinks will keep me under 0.08%” are not reliable.
If you have been drinking, the safest choice is not to drive.
What Is the BAC Limit for Drivers Under 21 in California?
Drivers under 21 are subject to much stricter BAC rules than most adult drivers.
California Vehicle Code § 23136 establishes a 0.01% BAC threshold under the state’s zero-tolerance law for drivers under 21.
This means an under-21 driver cannot simply rely on the standard 0.08% adult limit.
What is the 0.05% BAC rule for drivers under 21?
California Vehicle Code § 23140 separately addresses drivers under 21 with a BAC of 0.05% or higher.
The two provisions should be distinguished:
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VC § 23136: 0.01% zero-tolerance provision.
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VC § 23140: 0.05% BAC provision for drivers under 21.
For an under-21 driver, the applicable law can therefore be significantly stricter than the standard adult 0.08% rule.
What Is the BAC Limit for Commercial Drivers in California?
The BAC threshold is 0.04% for a person operating a commercial motor vehicle covered by Vehicle Code § 23152(d).
This is half the standard 0.08% threshold for most adult drivers.
A commercial driver therefore should not assume that staying below 0.08% means they are below the applicable California BAC limit.
The type of vehicle being operated matters.
What Is the BAC Limit for Passenger-for-Hire Drivers?
California establishes a 0.04% BAC threshold under Vehicle Code § 23152(e) for driving a vehicle with a passenger for hire under the circumstances covered by the statute.
This lower threshold can apply to drivers who are transporting passengers for compensation.
As a result, a person driving for a passenger transportation service cannot necessarily rely on the ordinary 0.08% adult BAC limit.
What Is the BAC Limit for Someone on DUI Probation?
The BAC threshold is 0.01% for a person on qualifying DUI probation under Vehicle Code § 23154.
This is another important exception to the standard 0.08% limit.
A person on DUI probation therefore should not assume that the ordinary adult BAC threshold applies to them.
Example
An adult driver on DUI probation consumes alcohol and later drives.
Even if the driver’s BAC is below 0.08%, the driver may still be subject to the separate 0.01% probation-related BAC restriction.
Is 0.08% BAC the Same as Being Legally Impaired?
No. The 0.08% BAC threshold is a statutory limit for most adult drivers; it does not mean that alcohol cannot impair driving ability below that level.
California separately prohibits driving while under the influence of alcohol.
This is why a person should not interpret 0.08% as a “safe amount” of alcohol to have in their system before driving.
A BAC below the applicable statutory threshold does not necessarily eliminate DUI exposure if the evidence shows impairment.
What Are the Different California BAC Limits?
For quick reference:
| Driver or situation | BAC limit | Vehicle Code |
|---|---|---|
| Most drivers age 21+ | 0.08% | § 23152(b) |
| Driver under 21 — zero tolerance | 0.01% | § 23136 |
| Driver under 21 | 0.05% | § 23140 |
| Commercial motor vehicle | 0.04% | § 23152(d) |
| Passenger for hire | 0.04% | § 23152(e) |
| DUI probation | 0.01% | § 23154 |
This table summarizes the key California BAC thresholds that drivers should know.
What Happens if You Drive Over the California BAC Limit?
Driving with a BAC at or above the applicable statutory threshold can result in a DUI charge and other legal consequences.
Potential consequences can include:
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Criminal penalties
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Fines and assessments
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DUI education requirements
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Probation
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Driver’s-license consequences
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Increased penalties for repeat offenses
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More serious consequences when an accident causes injury or death
The consequences depend on the driver’s history, the applicable statute, the BAC level, and the circumstances of the incident.
A first-time DUI can also be treated differently from a subsequent DUI.
California BAC Limit FAQs
1. What is the legal BAC limit in California?
For most drivers age 21 and older, the BAC limit under Vehicle Code § 23152(b) is 0.08%.
2. Can you get a DUI below 0.08% in California?
Yes. California separately prohibits driving while under the influence of alcohol. A BAC below 0.08% does not automatically prevent a DUI charge.
3. What is the BAC limit for drivers under 21?
California has a 0.01% zero-tolerance threshold under Vehicle Code § 23136. Vehicle Code § 23140 separately addresses drivers under 21 with a BAC of 0.05% or higher.
4. What is the BAC limit for commercial drivers?
The BAC threshold is 0.04% for driving a qualifying commercial motor vehicle under Vehicle Code § 23152(d).
5. What is the BAC limit for passenger-for-hire drivers?
The BAC threshold is 0.04% under Vehicle Code § 23152(e) when the passenger-for-hire provision applies.
6. What is the BAC limit while on DUI probation?
The BAC threshold is 0.01% under Vehicle Code § 23154 for a person on qualifying DUI probation.
7. How many drinks can I have before driving?
There is no guaranteed number of drinks that will keep you below the applicable BAC limit. BAC varies from person to person.
8. Is 0.08% BAC the same as being impaired?
No. Alcohol can impair driving ability below 0.08%, and California separately prohibits driving while under the influence.
9. Does the 0.08% limit apply to everyone?
No. California has lower BAC thresholds for drivers under 21, commercial drivers, passenger-for-hire drivers, and people on DUI probation.
Key Takeaways
The California BAC limit depends on the driver and the circumstances.
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0.08% — VC § 23152(b): Generally applies to most drivers.
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0.01% — VC § 23136: Applies to drivers under 21 under the zero-tolerance law.
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0.05% — VC § 23140: Applies to drivers under 21 with a BAC of 0.05% or higher.
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0.04% — VC § 23152(d): Applies to drivers operating a qualifying commercial motor vehicle.
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0.04% — VC § 23152(e): Applies to drivers operating a vehicle with a passenger for hire under the statute.
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0.01% — VC § 23154: Applies to people on qualifying DUI probation.
Most importantly, there is no guaranteed number of drinks that a person can consume before driving legally, and a BAC below 0.08% does not automatically prevent a DUI charge.
Contact Southwest Legal
If you are facing a DUI allegation or have questions about how California’s BAC laws apply to your situation, understanding the specific statute and circumstances is important.
Southwest Legal can help you understand your rights and the legal issues involved in a California DUI matter. Contact us today for a free consultation.
Disclaimer: This article is for general informational purposes only and does not constitute legal advice or create an attorney-client relationship unless and until the firm and client enter into an agreement for legal services. Laws may change, and legal outcomes depend on the specific facts of each case. Consult a qualified attorney for advice regarding your situation.