Finding a Colorado Emissions Testing Station
Colorado requires emissions testing for most vehicles registered in certain counties, and you can get tested at any station certified by the Colorado Department of Public Health and Environment (CDPHE). The state does not run the testing stations itself — instead, it licenses private repair shops, service stations, and dedicated testing centers to perform the work. You do not have to go to a dealership or a specific brand's shop; any licensed station will do.
The easiest way to find a station near you is through the CDPHE's online station locator at cdphe.colorado.gov. You can search by county or ZIP code and see which stations are currently open and accepting vehicles. Many stations are independent repair shops that added emissions testing as part of their regular business, so you may recognize local names in your results.
Testing typically takes 15 to 30 minutes once you arrive, though wait times vary by location and time of day. Some stations accept walk-ins; others require an appointment. Call ahead if you want to avoid a long wait, especially during peak testing periods in the weeks before your registration expires.
Key Takeaways
- Colorado's CDPHE maintains a searchable online list of all licensed emissions testing stations, organized by county and ZIP code.
- Any certified station can test your vehicle — you are not required to use a dealership or a specific brand's facility.
- Testing takes 15 to 30 minutes and costs vary by station, but the state does not set a fixed price.
- Most stations accept walk-ins, but calling ahead can save you time during busy periods.
- You will need your vehicle registration and proof of ownership when you arrive for your test.
What to Bring and How to Prepare
Bring your vehicle registration and a photo ID to the testing station. The technician will need to verify that the vehicle you are testing matches the registration on file. If you are not the registered owner, bring a letter of authorization from the owner or proof that you are authorized to test the vehicle on their behalf — policies vary by station, so call ahead if this applies to you.
Your vehicle's check engine light should not be on. If it is, the vehicle will fail the emissions test automatically, and you will need to have the problem diagnosed and repaired before you can retest. Some stations can help diagnose the issue; others will refer you to a repair shop. Either way, fixing the underlying problem comes before a passing test.
Make sure your gas cap is tight and in good condition. A loose or damaged cap can trigger a failed test because it allows fuel vapors to escape. This is one of the easiest fixes — a new cap costs a few dollars — and is worth checking before you go.
Testing Costs and What Happens After You Pass
Colorado does not set a statewide price for emissions testing, so costs vary by station. Most stations charge between $20 and $40 for a basic emissions test. Some offer package deals that combine emissions testing with a safety inspection or other services. Ask about the price when you call to schedule or before the technician begins work.
When your vehicle passes, the station will provide you with a passing certificate or report. You do not need to bring this to the DMV — the testing station reports the result directly to the state's system, and your registration renewal will process based on that report. Keep a copy for your records in case you need to prove you tested, but you do not have to submit it anywhere.
If your vehicle fails, the station will give you a detailed report showing which emissions standards your vehicle did not meet. You will then need to have the problem repaired and return for a retest. Retest fees are usually lower than the initial test, often $10 to $20, and you have a set window to retest before your registration expires.
Counties That Require Emissions Testing
Not all of Colorado requires emissions testing. The state mandates testing in counties with air quality concerns, primarily in the Denver metropolitan area and surrounding regions. Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, El Paso, Jefferson, Larimer, Pueblo, and Weld counties all require emissions testing for most vehicles.
If you live in one of these counties and your vehicle is registered there, you must test before you renew your registration. If you live outside these counties, you do not need to test unless you are registering a vehicle in one of the required counties. Check your registration notice or the CDPHE website to confirm whether your county requires testing.
Vehicles that are very new, very old, or have special status (such as classic cars or vehicles with historical plates) may be exempt from testing. Your registration notice will tell you whether your vehicle must be tested. If you are unsure, contact the Colorado Division of Motor Vehicles or ask the testing station when you call.
What to Do If Your Vehicle Fails
A failed test means your vehicle did not meet Colorado's emissions standards in one or more categories. The testing station will provide a report showing which standards were not met — usually nitrogen oxides, hydrocarbons, carbon monoxide, or particulate matter. This report is your starting point for repairs.
Take the report to a repair shop and discuss what might be causing the failure. Common issues include a faulty oxygen sensor, a clogged fuel injector, a bad catalytic converter, or problems with the fuel system. Some repair shops specialize in emissions-related work and can diagnose the problem quickly. Others may need to run additional diagnostics.
Once repairs are complete, you can return to any licensed testing station for a retest. You do not have to return to the same station where you failed. Retest fees are lower than the initial test, and you typically have 60 days from the date of your first test to retest before your registration expires. Check your test report for the exact important date.
Online Scheduling and Station Locator Tools
The CDPHE's station locator at cdphe.colorado.gov/apcd/emissions is the official resource for finding testing stations. Enter your county or ZIP code and you will see a list of all licensed stations in your area, including their addresses, phone numbers, and hours of operation. Some stations list whether they accept appointments or walk-ins.
Many individual testing stations also have their own websites or social media pages where they post hours, pricing, and wait times. A quick search for "emissions testing near me" plus your city name will often turn up local stations with current information. Calling ahead is still the most reliable way to confirm hours and avoid a long wait.
If you are moving to Colorado or registering a vehicle for the first time, use the locator to find a station before your registration important date. Testing must be completed before your registration expires, so plan ahead rather than waiting until the last week.
Frequently Asked Questions
Can I test my vehicle at any station, or do I have to go to a specific one?
You can test at any station licensed by the CDPHE. The state does not require you to use a dealership, a specific brand, or a particular shop. All licensed stations use the same testing equipment and report results to the state in the same way, so the choice is yours based on location, hours, and price.
What if I fail my emissions test — do I have to buy a new car?
No. A failed test means your vehicle needs repairs, not replacement. Common fixes like replacing an oxygen sensor, cleaning fuel injectors, or repairing a fuel leak are usually inexpensive. You have time to get repairs done and retest before your registration expires.
How long does it take to get my test results?
You get your results the same day you test. The station will tell you whether you passed or failed before you leave, and they will provide a written report. The station reports the result to the state electronically, so your registration system is updated within a day or two.
Do I need an appointment, or can I just walk in?
Most stations accept walk-ins, but some require appointments, especially during busy periods. Call the station ahead of time to ask about their policy and current wait times. Scheduling an appointment can save you time, particularly in the weeks before registration important date.
What if my vehicle is registered in Colorado but I live out of state?
You can test at any licensed station in the required Colorado counties. If you are not in Colorado, contact the testing station by phone to ask about mail-in or remote options — some stations may be able to work with you, though most require the vehicle to be present for testing.