Napa, CA ignition interlock: 4 certified installers
4 in town, 26 more within reach of Napa
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4 certified centers in Napa, run by 5 providers. Addresses below — call ahead, most centers fit devices by appointment.
Certified installation centers in Napa
Sorted by how far they are from the center of Napa. Where two providers work out of the same garage, we list the garage once with both names, and we include nearby towns when their center is closer than one of your own.
Compiled from providers’ own public location directories and deduplicated to unique physical places (how we build this index). Listing is not an endorsement, and no center pays to appear.
Not sure which center to call?
Send your details once and certified installers covering Napa will get in touch with availability and a price for your term. It costs nothing, and you are not committing to anything by asking.
We pass your details only to providers that are certified in California. We never sell your information on, and you can tell them to stop at any time.
What it costs in Napa
Interlock pricing is set at state level, so what applies in Napa applies across California. These figures come from the price schedule filed with the state.
California does not cap what a provider may charge. It regulates the other side of the bill: how much of that price falls on you. Providers are required by law to apply this schedule, and to cover the rest themselves.
| Your income | Your share of the provider’s standard program cost |
|---|---|
| Income at or below 100% of the federal poverty level | driver pays 10% |
| Income at 101–200% of the federal poverty level | driver pays 25% |
| Income at 201–300% of the federal poverty level, or receiving CalFresh | driver pays 50% |
| Income at 301–400% of the federal poverty level | driver pays 90% |
| Everyone else | driver pays 100% |
Share of the cost set by law against the driver’s income · California Vehicle Code § 23575.3(k) — fee schedule by income · effective 2019-01 · checked 2026-08-26
- The percentages are of the provider’s own standard program cost, which California does not cap. A share of an unregulated number is still an unregulated number.
- Subdivision (k)(1)(G) puts the remainder on the manufacturer, not the state — the provider absorbs whatever the driver does not pay.
- Proof required is one of: last year’s federal tax return, three months of income statements, EDD unemployment verification, or proof of CalFresh.
- Under subdivision (l) the Department of Consumer Affairs may fine a provider up to $1,000 for failing to tell a driver this schedule exists, or for not applying it.
What California requires
California runs a statewide pilot program covering offenses from 1 January 2019 through 31 December 2032. Fit the device and you may drive anytime and anywhere, as long as the vehicle has one. A first offense that involved neither drugs alone nor injury is excluded from the mandate altogether — the requirement starts with injury or a prior conviction.
- First offense: None for a first non-injury offense; 1 year if it caused injury; with one prior, 1 year (2 with injury); with two, 2 years (3 with injury); with three or more, 3 years
- Lockout threshold: Set by the certified device standard adopted by the state
- Program run by: California DMV, on the court abstract of conviction
Why California orders these devices
An interlock order is not a judgment about you personally — it is what the state does with every case of this kind, and the reason sits in the crash record.
Source: NHTSA Fatality Analysis Reporting System, 2020–2022. The count covers fatal crashes where police recorded that a driver had been drinking, which is narrower than the federal 0.08 BAC measure and therefore understates the real figure. Napa County runs above the California average, which is part of why the interlock requirement here is enforced the way it is. What the device changes is measurable too: a car fitted with one cannot be started over the limit, which is why the order attaches to driving privileges rather than to the sentence.
Other cities in California
If nothing in Napa works for you, a center one town over often has an earlier appointment — the price does not change.
Interlock questions in Napa
Where can I get an ignition interlock device installed in Napa, CA?
We index 4 certified installation points in Napa, run by Intoxalock, ADS Interlock, Low Cost Interlock and others. Addresses are listed above. Book with the provider your paperwork names, not the nearest one — a device approved in one state is not automatically approved in the next, and switching brands mid-term means a second installation fee.
How much does it cost to have an ignition interlock device installed in California?
California does not set the price at all — it sets your share of it. State law fixes how much of the provider's standard cost falls on you, by income, and makes the provider absorb the rest. For the size of that underlying bill the national figures are the reference: NHTSA puts installation at $70 to $90 and monitoring at about $70 a month, roughly $3 to $4 a day. Quotes in Napa will sit around that unless the provider is charging for something the state does not require.
Can I drink one beer and still start the car in California?
Almost certainly not. California does not print one fixed number in the statute — the level is set by the certifying agency in the device standard, typically between 0.02% and 0.025% BAC, far below the 0.08% driving limit. The device is not testing whether you are impaired, it is testing whether you drank. One drink shortly before a test is enough on most programs, and the fail is recorded whether or not you try again.
What does an ignition interlock device do?
An ignition interlock is a breath-alcohol tester wired into your car ignition. You blow into it before starting the engine; if your breath alcohol is above the state threshold, the engine will not start.
While you are driving, the device asks for rolling retests at random intervals. Every sample, skipped test, and lockout is recorded and sent to the agency monitoring your case.
All California cities →Why California requires it →What it costs in California →DUI lawyers in California →If the device recorded a violation →
The class California requires →The insurance filing in California →How long it stays on your record →