California's Smog Check Exemption Map
Not all California counties require a smog check to register or renew your vehicle. Smog exempt counties are areas where air quality is consistently good enough that the state does not mandate emissions testing. If you live in one of these counties, you will not need to pass a smog test to register a new vehicle or renew your registration — though you may still need one if you move to a non-exempt county or if your vehicle is subject to a referee inspection.
The state updates its exempt county list based on air quality data collected over several years. A county becomes exempt when it demonstrates that it meets federal air quality standards. Currently, the exempt counties are Alpine, Amador, Calaveras, Inyo, Madera, Mariposa, Merced, Modoc, Mono, Nevada, Placer, Plumas, and Tuolumne. However, this list can change, and some counties have moved in and out of exempt status over time.
Even in exempt counties, certain vehicles may still need testing. Vehicles registered in a non-exempt county that are being transferred to an exempt county, or vehicles that fail a referee inspection, may require a smog check regardless of where they are registered.
Key Takeaways
- Thirteen California counties currently do not require smog checks: Alpine, Amador, Calaveras, Inyo, Madera, Mariposa, Merced, Modoc, Mono, Nevada, Placer, Plumas, and Tuolumne.
- The state bases exemptions on multi-year air quality data, and the exempt county list can change if air quality declines or improves.
- Vehicles moving from a non-exempt to an exempt county may still need a smog check at the time of transfer, depending on the vehicle's age and history.
- You can confirm whether your county is exempt by checking the California Department of Consumer Affairs Bureau of Automotive Repair website or calling your local DMV.
How Counties Become Exempt From Smog Testing
The California Air Resources Board (CARB) determines which counties are exempt based on whether they meet the National Ambient Air Quality Standards (NAAQS) set by the federal Environmental Protection Agency. A county must demonstrate that it consistently meets these standards across multiple years of air quality monitoring before it can be designated as exempt.
Counties that fail to meet air quality standards remain in the smog check program. If an exempt county's air quality declines and it falls out of compliance with federal standards, it can be moved back into the program. This has happened in the past — some counties that were once exempt have been returned to the testing requirement when their air quality worsened.
The state reviews air quality data regularly, so the exempt list is not permanent. If you live in a county near the border of exempt status, it is worth checking the current list before assuming your county is exempt.
Vehicles That Still Need Testing in Exempt Counties
Even if you live in an exempt county, your vehicle may still require a smog check in certain situations. Vehicles that are model year 1975 or older are exempt from smog testing statewide, regardless of county. However, vehicles from 1976 onward may need testing depending on their registration history and the county where they were previously registered.
If you are transferring a vehicle from a non-exempt county to an exempt county, you may need to pass a smog check before the transfer is complete. The requirement depends on when the vehicle was last tested and whether it has been registered in a non-exempt area. Check with your local DMV office or the Bureau of Automotive Repair to confirm whether your specific vehicle needs testing.
Vehicles that fail a referee inspection — a more rigorous test performed by a state referee when a vehicle fails a standard smog check — must pass that referee test before registration, even in exempt counties. Additionally, if your vehicle is flagged for high-mileage or other factors, you may be required to test regardless of your county's exempt status.
How to Confirm Your County's Exempt Status
The most reliable source for the current exempt county list is the California Department of Consumer Affairs Bureau of Automotive Repair (BAR) website. The BAR maintains an updated list of all counties that are currently exempt from smog testing requirements. You can also contact your local DMV office directly — staff there can tell you whether your county is exempt and whether your specific vehicle needs testing.
If you are moving to California or relocating within the state, confirm your new county's status before you register your vehicle. Some people discover they need a smog check only when they arrive at the DMV, which can delay registration. Checking ahead saves time and prevents registration holds.
What Happens If You Move Between Exempt and Non-Exempt Counties
If you move from an exempt county to a non-exempt county, your vehicle will need to pass a smog check before you can register it in the new location. The timing depends on your vehicle's age and when it was last tested. Generally, vehicles registered in non-exempt counties must pass a smog check every two years, with some exceptions for newer vehicles.
If you move from a non-exempt county to an exempt county, you may not need a smog check for your next registration — but this depends on your vehicle's registration history and model year. The DMV will tell you at the time of registration whether testing is required. Do not assume you are exempt just because your new county is exempt; the requirement is based on where the vehicle was previously registered and how long ago it was last tested.
Keep your smog check records when you move. If your vehicle passed a test in a non-exempt county, that record may affect whether you need testing in your new location. Some counties recognize recent passing tests from other counties and may waive the requirement temporarily.
Vehicles Exempt From Smog Checks Statewide
Certain vehicles do not need smog checks anywhere in California, regardless of county. Vehicles manufactured in 1975 or earlier are exempt statewide. Diesel vehicles registered before January 1, 1998, are also exempt. Electric vehicles and hydrogen fuel cell vehicles are exempt from smog testing.
Motorcycles, motorized bicycles, and vehicles with a gross vehicle weight rating over 14,000 pounds have different testing requirements or exemptions. If you own one of these vehicle types, check with the BAR or your local DMV to understand what applies to your situation.
New vehicles may have a grace period before their first smog check is required. A vehicle that is brand new and has never been registered in California typically does not need a smog check for its first registration, even in a non-exempt county. After that, the testing schedule depends on your county and vehicle age.
Frequently Asked Questions
Can I register my vehicle in an exempt county if I live in a non-exempt county?
No. Your vehicle must be registered in the county where you live. You cannot use an exempt county's address to avoid smog testing if you actually reside elsewhere. The DMV requires proof of residency, and registering a vehicle at a false address is registration fraud.
If my county becomes non-exempt, do I need a smog check when ready?
Not when ready, but you will need one at your next registration renewal. If your county is moved out of exempt status, vehicles registered there will be required to pass a smog check on their next renewal cycle. The state typically provides notice before making this change.
What if I buy a used car from an exempt county and move it to a non-exempt county?
You will need to pass a smog check before you can register the vehicle in your non-exempt county. The exemption applies only to vehicles registered in exempt counties; once you transfer registration to a non-exempt area, the testing requirement applies. Plan for this before you complete the purchase.
Do I need a smog check if I renew my registration online?
If you live in an exempt county and your vehicle does not fall into a category that requires testing, you can renew online without a smog check. If you live in a non-exempt county or your vehicle requires testing for any reason, you must obtain a smog check before you can complete the renewal, whether you do it online or in person.
Where can I find the official list of exempt counties?
The California Department of Consumer Affairs Bureau of Automotive Repair website publishes the current exempt county list. You can also call your local DMV office or visit in person to confirm your county's status and whether your vehicle needs testing.