What Is the Legal Blood Alcohol Limit in New Jersey?
The legal blood alcohol limit in New Jersey is 0.08% for most adult drivers. Under N.J.S.A. 39:4-50, driving with a blood alcohol concentration (BAC) of 0.08% or more is drunk driving, even if you feel fine. Lower limits apply to commercial drivers (0.04%) and to drivers under 21 (0.01%). You can also be convicted of DWI below 0.08% if the State proves you were actually under the influence.
| Question | Short answer |
|---|---|
| Legal limit for adult drivers | 0.08% BAC (N.J.S.A. 39:4-50) |
| Limit in a commercial vehicle | 0.04% BAC (N.J.S.A. 39:3-10.13) |
| Limit for drivers under 21 | 0.01% BAC, a separate offense under N.J.S.A. 39:4-50.14 |
| DWI possible under 0.08%? | Yes, based on proof you were under the influence of alcohol or drugs |
| How BAC is measured | Usually a breath test on the Alcotest 9510; sometimes a blood test |
| Does BAC change the penalty? | Yes. First-offense fines, interlock time and license loss rise at 0.10% and 0.15% |
| Refusing the breath test | A separate offense under N.J.S.A. 39:4-50.4a, with its own penalties |
What Is the Legal BAC in NJ?
New Jersey’s drunk driving statute, N.J.S.A. 39:4-50, can be violated in two ways. The first is driving while under the influence of alcohol or drugs. The second is driving with a BAC of 0.08% or more. The second is called a per se violation, because the reading itself is the proof. The State does not have to show you were swerving or slurring.
BAC is a percentage. A reading of 0.08% means 0.08 grams of alcohol per 100 milliliters of blood, or the breath equivalent. How many drinks it takes to reach 0.08% depends on your weight, sex, food, timing and the drinks themselves. There is no safe drink count that guarantees you stay under the limit.
What BAC Is Evidence of Intoxication in New Jersey?
A BAC of 0.08% or more is, by itself, enough to prove a DWI in New Jersey. Below that, the number is not automatic proof of anything. The State can still try to prove you were under the influence with other evidence, such as the officer’s observations, field sobriety tests, body camera video and any admissions.
Can You Get a DWI Under 0.08 in NJ?
Yes. Because the statute also covers driving under the influence, a driver at 0.05% or 0.06% can still be charged. New Jersey courts have held that an officer’s observations can be enough to sustain a DWI conviction. See State v. Cryan, 363 N.J. Super. 442 (App. Div. 2003). The same is true for drugs, where there is no BAC number at all. In State v. Bealor, 187 N.J. 574 (2006), the Supreme Court addressed how the State may prove a drug-impaired DWI with lay observations and other evidence.
A low reading often helps the defense, though. It can make an officer’s claim of heavy impairment harder to believe. The defense can also point to innocent reasons for poor performance on field tests, such as nerves, injuries, footwear or road conditions.
What BAC Can a Driver Under 21 Have in NJ?
A person under the age of 21 may not drive with a BAC of 0.01% or more. Under N.J.S.A. 39:4-50.14, a driver under the legal drinking age with a BAC of 0.01% or more but less than 0.08% commits a separate offense, not a DWI. The penalties are:
- Loss of driving privileges, or a delay in getting a license, for 30 to 90 days
- 15 to 30 days of community service
- An Intoxicated Driver Resource Center (IDRC) program or an alcohol education and highway safety program
An underage driver at 0.08% or more can be charged with a full DWI under N.J.S.A. 39:4-50 as well. Read more about underage DWI in New Jersey.
Legal Alcohol Limit for Commercial Drivers
N.J.S.A. 39:3-10.13 makes it illegal to drive a commercial motor vehicle with an alcohol concentration of 0.04% or more. A first violation in a commercial vehicle can lead to a suspension of commercial driving privileges of one to three years, or three years if the driver was hauling placarded hazardous materials (N.J.S.A. 39:3-10.20). A CDL holder convicted of DWI in a personal car also faces a one-year loss of commercial privileges under that statute.
First-Offense DWI Penalties by BAC in New Jersey
Your BAC reading matters even after a conviction. P.L.2019, c.248, effective December 1, 2019, rewrote first-offense penalties around three BAC tiers. P.L.2023, c.191, which took effect in early 2024, extended that law to January 1, 2029 and lengthened the interlock time for the highest tier. Here is the current structure under N.J.S.A. 39:4-50 and N.J.S.A. 39:4-50.17:
| First-offense BAC | Fine | License | Ignition interlock |
|---|---|---|---|
| 0.08% to under 0.10% | $250 to $400 | Forfeited until an interlock is installed | 3 months |
| 0.10% to under 0.15% | $300 to $500 | Forfeited until an interlock is installed | 7 months to 1 year |
| 0.15% or more | $300 to $500 | Forfeited for 3 months after the interlock is installed, with a credit of 1 day for every 2 days the interlock is in place (no credit if someone suffered serious bodily injury) | During the forfeiture, then 12 to 15 more months |
Every tier also carries:
- 12 to 48 hours at an Intoxicated Driver Resource Center, over two consecutive days of at least six hours each
- Possible jail of up to 30 days
- An insurance surcharge of $1,000 a year for three years, plus state fees and surcharges
The 2024 amendments also let a first offender avoid the fine if he or she had a valid New Jersey license in good standing at the time of the offense, kept it in good standing until conviction, and installed an interlock and obtained a notated license. Ask a lawyer whether that applies to you. The 2019 law also removed the old school-zone enhanced penalties. Second and third offenses carry much heavier penalties; see our full guide to New Jersey DWI penalties and how the ignition interlock requirement works.
How Does New Jersey Measure BAC?
Breath Testing on the Alcotest 9510
Most New Jersey DWI cases rely on a breath test given at the police station on the Draeger Alcotest 9510. In State v. Chun, 194 N.J. 54 (2008), the Supreme Court found the earlier Alcotest 7110 reliable, subject to conditions. The 9510 has not had a similar ruling. A challenge to its reliability reached the Supreme Court, but in December 2025 the Court dismissed the appeal after the defendant stopped challenging the device’s scientific reliability. The Court lifted its stay on 9510 cases and said defendants may still challenge the device in their own cases. Learn more about the Alcotest 9510.
Calibration matters. In State v. Cassidy, 235 N.J. 482 (2018), the Court held breath results inadmissible when the machine was calibrated without a NIST-traceable thermometer.
Blood Tests
Blood tests are often used after crashes, when drugs are suspected, or when a breath test is not possible. Police generally need a warrant, consent or a true emergency to draw blood. In State v. Adkins, 221 N.J. 300 (2015), the Court applied the totality-of-the-circumstances test from Missouri v. McNeely to warrantless blood draws.
Refusing the Breath Test
Refusing to give breath samples is a separate offense under N.J.S.A. 39:4-50.4a. A first refusal carries a fine of $300 to $500, license forfeiture until an interlock is installed, and an IDRC referral. See breath test refusal in NJ.
Using Your BAC Reading in Your Defense
A BAC number is only as good as the test behind it. A defense lawyer will request the Alcotest data, calibration and maintenance records, operator credentials and the 20-minute observation period required by Chun. Video can show whether the officer watched you closely before the test. For blood, the lawyer looks at the warrant, chain of custody and lab methods. If the reading is thrown out, the State may be left with observations alone, and a reading near a tier line can change the penalty. For an example, read how a 0.09 BAC DWI was dismissed at trial.
Frequently Asked Questions
What Is the Legal Alcohol Limit to Drive in NJ?
For most drivers 21 and older, it is 0.08% BAC. It is 0.04% in a commercial vehicle and 0.01% for drivers under 21.
Is 0.05 BAC Legal in New Jersey?
A 0.05% reading is under the per se limit for adult drivers. You can still be charged with DWI if the State claims you were under the influence based on other evidence.
Is an Underage BAC Violation the Same as a DWI?
No. A reading of 0.01% to under 0.08% for a driver under 21 is a separate offense under N.J.S.A. 39:4-50.14, with a 30 to 90 day license loss, community service and an alcohol program.
What Happens With a BAC of 0.15 or Higher on a First Offense?
The driver faces a fine of $300 to $500, a license forfeiture of three months after an ignition interlock is installed, and an interlock for 12 to 15 months after that, plus IDRC and possible jail.
Can a Breath Test Result Be Challenged in NJ?
Yes. Calibration, the observation period, operator training and the device itself can all be challenged, and results from an improperly calibrated machine can be excluded.
Talk to a New Jersey Lawyer About Your BAC Reading
William Proetta Criminal Law has over 15 years of criminal trial experience in municipal courts across New Jersey. We review the breath or blood test records, the video and the officer’s report to find weaknesses in the State’s BAC evidence. Call (201) 793-8018 for a free, confidential review, 24/7, or contact us online. Se habla español.
