Finding an emissions testing station near you

Arizona's emissions testing program is run by the Department of Environmental Quality (ADEQ), and they maintain a searchable list of testing stations on their website. You can search by county or city to find locations near your home or workplace. Most stations are privately owned repair shops, smog shops, or service centers that have been certified to perform the test.

The ADEQ website lets you filter by location and see which stations are currently open. Many stations operate during standard business hours, though some offer early morning or evening appointments. You do not need to call ahead at every station — many allow walk-ins, but calling first can save you a wait, especially during peak testing months like January and August when people renew registrations.

Key Takeaways

  • ADEQ's online station locator at azdeq.gov is the official source for finding certified testing locations by county or city.
  • Most testing stations are privately owned shops, not government offices, and many accept walk-ins during business hours.
  • The test costs between $20 and $40 depending on the station, and you will need your vehicle registration and proof of insurance.
  • Testing is required every two years in Maricopa and Pima counties, and every year in some other areas — check your registration notice to confirm your important date.
  • If your vehicle fails, you have 60 days to fix it and retest at no additional charge at the same station.

What to bring to your testing appointment

Bring your vehicle registration card and a valid photo ID. Some stations also ask for proof of insurance, though this is not always required — calling ahead will tell you what that specific station needs. Your vehicle's odometer reading may be recorded, so know your current mileage.

The test itself takes 10 to 15 minutes. The technician will connect your vehicle to a machine that measures exhaust emissions. You do not need to do anything except sit in the car while they run the test. If your vehicle passes, you receive a certificate when ready, which you can take to your local Motor Vehicle Division office to renew your registration.

Cost and payment methods

Testing fees range from $20 to $40 depending on which station you visit. Each station sets its own price within ADEQ guidelines. Most stations accept cash, debit cards, and credit cards. Some may require payment before the test, while others charge after you pass or fail.

If your vehicle fails the test, you do not pay again to retest at the same station within 60 days. This gives you time to have repairs made and return for a second test. If you go to a different station to retest, that station may charge the full fee again.

Counties with different testing requirements

Maricopa County (Phoenix area) and Pima County (Tucson area) require emissions testing every two years. Several other Arizona counties — including Yavapai, Coconino, and Santa Cruz — require testing every year. The rest of Arizona does not require emissions testing at all.

Your vehicle registration notice will state whether testing is required and when your important date is. If you are unsure which county you live in or what your testing schedule is, call your local Motor Vehicle Division office or check your registration paperwork. Testing is due by the expiration date on your registration, and driving without a current test certificate when one is required can result in a citation.

What happens if your vehicle fails

A failed test means your vehicle's emissions are above the legal limit. The test report will show which pollutants are too high — usually nitrogen oxides, particulates, or hydrocarbons. This report is your starting point for repairs. Take it to a mechanic and explain which emissions are failing.

You have 60 days from the test date to have repairs made and return to the same station for a retest at no charge. If you retest at a different station, you will pay the testing fee again. Once you pass, take your certificate to the Motor Vehicle Division to renew your registration. If you do not retest within 60 days, your registration will expire and you cannot legally drive the vehicle.

Testing during registration renewal

You can get your emissions test done at any time during your registration period, not just at renewal. Many people test early to avoid the rush in their renewal month. If you test more than 120 days before your registration expires, the certificate may not be valid for that renewal — check with your testing station about their certificate validity window.

When you renew your registration online or in person at the Motor Vehicle Division, you will need to provide your test certificate number or upload a copy of the certificate itself. If you renewed online, you can usually upload the certificate through your account. If you renewed in person, bring the physical certificate with you.

Finding stations in rural or remote areas

If you live in a county that requires testing but far from any station, ADEQ's locator will show you the nearest options, which may be 30 miles or more away. Some rural counties have only one or two testing stations. Call ahead to confirm hours, since rural stations may have limited schedules.

If no testing station exists in your county, you may be able to test in a neighboring county. Contact your local Motor Vehicle Division office to ask whether out-of-county tests are accepted for your registration. Some counties allow this, while others require testing within the county.

Frequently Asked Questions

Can I test my vehicle before my registration expires?

Yes. You can test anytime during your registration period. However, if you test more than 120 days before expiration, the certificate may expire before your registration does. Ask the testing station about their certificate validity dates to make sure your timing works.

What if I just bought a used car and do not have a registration yet?

You will need a registration card to test. Get a temporary registration from the Motor Vehicle Division first, then schedule your test. Some stations may accept a bill of sale or purchase agreement in place of a registration card — call ahead to ask.

Do I need an appointment or can I just show up?

Most stations accept walk-ins, but calling ahead is faster. During busy months like January and August, wait times can be 30 minutes to an hour. Calling lets you know if the station is busy and whether they have same-day openings.

What if I move to a different county in Arizona?

Update your address with the Motor Vehicle Division before your next registration renewal. Your new county's testing requirements will explore at that renewal. If you move from a county that requires testing to one that does not, you will not need to test again until you move back or renew in a testing county.

Can I get my test done at a dealership instead of an independent shop?

Some dealerships are certified to perform emissions testing, but most are not. Check the ADEQ locator to see if your dealership is listed. Independent smog shops and repair shops are more common testing locations and are usually faster and less expensive than dealerships.