ADEQ emissions testing locations are run by the Arizona Department of Environmental Quality, and you can find the nearest one using their online locator tool on the ADEQ website.
Arizona requires emissions testing in Maricopa and Pima counties — the Phoenix and Tucson areas — as part of vehicle registration. The ADEQ does not run the testing stations themselves. Instead, it licenses private repair shops and testing facilities to perform the test. When you search for a location, you are looking for one of these licensed private stations, not a government office.
The ADEQ maintains a searchable list of all licensed testing stations on its website. You can filter by county and city to find stations near your home or workplace. Each listing shows the station's address, phone number, and hours. Many stations are regular auto repair shops that added emissions testing as a service, so you may recognize familiar names in your area.
Key Takeaways
- ADEQ-licensed testing stations are private businesses, not government offices, and you choose which one to visit.
- The ADEQ website has a searchable locator tool that shows all licensed stations in Maricopa and Pima counties with their hours and phone numbers.
- Testing stations are usually auto repair shops, and many offer same-day or next-day appointments.
- You can call ahead to confirm the station is open and ask about wait times before you drive there.
How to find a station using the ADEQ locator
Go to the ADEQ website and look for the emissions testing section. The locator tool asks you to enter your county and city, then displays all licensed stations in that area. Each result includes the business name, street address, phone number, and operating hours.
The list does not rank stations by distance or wait time, so you may want to call two or three stations before choosing one. Ask whether they have same-day appointments, how long the test usually takes, and what the fee is — prices vary slightly between stations but are set by ADEQ rules, so they should all be similar.
What to bring when you visit
Bring your vehicle registration and proof of insurance. The testing station will need your vehicle identification number (VIN) and current mileage. If your vehicle has failed emissions before, bring any previous test results or repair records — the station may need to see what was fixed.
Your vehicle should be warmed up before the test, so plan to arrive a few minutes early and let it run. Do not arrive with a cold engine, as this can affect the results. If your check engine light is on, the vehicle will fail the test, so have that addressed before you go.
Testing stations in Maricopa County
Maricopa County includes Phoenix, Tempe, Mesa, Chandler, Scottsdale, and surrounding areas. The ADEQ locator will show you dozens of licensed stations across the county. Many are concentrated in Phoenix itself, but you can find stations in most suburbs and smaller cities within the county.
If you live in a smaller town within Maricopa County, you may have fewer options nearby. In that case, calling ahead is especially important — some smaller stations have limited hours or may be booked several days out during peak testing season, which runs from January through March.
Testing stations in Pima County
Pima County includes Tucson and surrounding communities. The ADEQ locator shows licensed stations throughout the county, with the highest concentration in Tucson itself. If you live in outlying areas like Oro Valley or Sahuarita, you may need to drive to Tucson for testing.
Pima County testing follows the same rules and fees as Maricopa County. The test takes about 10 to 15 minutes once you are in the bay, though wait times vary by station and time of day.
What happens if a station is closed or too far away
If the nearest station has long wait times or inconvenient hours, you can visit any other licensed station in your county. You are not required to use a specific station — ADEQ rules allow you to choose any licensed facility. Some people drive to a different city if that station has better availability.
If you cannot reach a station before your registration expires, contact ADEQ directly to ask about extensions or remote testing options. These are rare, but ADEQ can sometimes grant a brief extension if you can show you made a good-faith effort to get tested.
Frequently Asked Questions
Can I make an appointment online or do I have to call?
Most ADEQ-licensed stations do not take online reservations. Call the station directly to ask about availability. Some stations operate on a first-come, first-served basis, while others hold appointment slots. Calling ahead saves you a trip if the station is fully booked.
What if my vehicle fails the emissions test?
The testing station will give you a detailed report showing what failed. You then have 30 days to have the problem repaired and return for a retest at any licensed station. Some stations offer repair services in-house, but you can take your vehicle to any repair shop you trust.
How much does an emissions test cost?
ADEQ sets a maximum fee that all licensed stations can charge. The exact amount varies slightly by county and year, so call your chosen station to confirm the current price. The fee is usually between $20 and $30 for a standard test.
Do I need an appointment or can I just walk in?
It depends on the station. Some accept walk-ins during certain hours, while others require appointments. Call ahead to ask about the station's policy. During busy months like February and March, walk-ins may face long waits or be turned away if the station is full.
What if I move to a county that does not require emissions testing?
If you move out of Maricopa or Pima County, you no longer need to get an emissions test for vehicle registration. When you register your vehicle in the new county, you will not be asked for test results. Keep your old test results in case you move back to a testing county within a few years.