Diesel Emissions Program
Which counties require a passing emissions test to register a vehicle?
- Boulder
- Jefferson
- Broomfield
- Denver
- Douglas
- Portions of Adams
- Portions of Arapahoe
- Portions of Larimer
- Portions of Weld
- Portions of El Paso
See our
map for testing locations and diesel emissions area boundaries. For hours of operation, please contact the diesel testing station., If you are unsure if a diesel test is required in your area, please contact your local county motor vehicle office.
- The 2021 emissions requirements for a diesel vehicle
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2021 Diesel Emissions Requirement
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(GVWR up to 26000 lbs.)
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Model Year
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Heavy-Duty Diesel
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Frequency of Test
|
Testing Fee
|
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2021
|
Exempt
|
n/a
|
n/a
|
|
2020
|
Exempt
|
n/a
|
n/a
|
|
2019
|
Exempt
|
n/a
|
n/a
|
|
2018
|
Renewal are Exempt
|
n/a
|
n/a
|
|
Need test if transfer of ownership
|
n/a
|
Rates vary per diesel testing center
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|
2017
|
Need test
|
Every two years
|
Rates vary per diesel testing center
|
|
2016
|
Need test
|
Every two years
|
Rates vary per diesel testing center
|
|
2015
|
Need test
|
Every two years
|
Rates vary per diesel testing center
|
|
2014
|
Need test
|
Every two years
|
Rates vary per diesel testing center
|
|
2013
|
Need test
|
Every two years
|
Rates vary per diesel testing center
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|
1988 – 2012*
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Need test
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Annually
|
Rates vary per diesel testing center
|
|
1976 - 1988
With Collector Plates
|
Need test
|
Every five years
|
Rates vary per diesel testing center
|
|
1976 - 1988
Without Collector Plates
|
Need test
|
Annually
|
Rates vary per diesel testing center
|
|
1976 or newer Grandfathered**
|
Exempt
|
n/a
|
n/a
|
|
1975 and older
With Collector Plates
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Exempt
|
n/a
|
n/a
|
|
1975 and older without Collector Plates
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Need test
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Annually
|
Rates vary per diesel testing center
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*2008 Transition from biennial to annual testing is based on the MSO (Manufacturer Statement of Origin) date of the vehicle. See local County DMV for more information.
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** Vehicles model year 1976 or newer that have been registered as a "collector's item" prior to September 1, 2009, and the registration has never lapsed or expired or had a change of ownership.
|
|
2021 Diesel Emissions Requirements
|
|
(GVWR 26000 lbs. or more)
|
|
|
Model Year
|
Heavy-Duty Diesel
|
Frequency of Test
|
Testing Fee
|
|
2021
|
Exempt
|
n/a
|
n/a
|
|
2020
|
Exempt
|
n/a
|
n/a
|
|
2019
|
Exempt
|
n/a
|
n/a
|
|
2018
|
Exempt
|
n/a
|
n/a
|
|
2017
|
Exempt
|
n/a
|
n/a
|
|
2016
|
Renewal are Exempt
|
n/a
|
n/a
|
|
Need test if transfer of ownership
|
Every two years
|
Rates vary per diesel testing center
|
|
2015
|
Need test
|
Every two years
|
Rates vary per diesel testing center
|
|
2014
|
Need test
|
Every two years
|
Rates vary per diesel testing center
|
|
2013*
|
Need Test
|
Every two years
|
Rates vary per diesel testing center
|
|
1988 - 2012
|
Need Test
|
Annually
|
Rates vary per diesel testing center
|
|
1976 – 1988
With Collector Plates
|
Need Test
|
Every five years
|
Rates vary per diesel testing center
|
|
1976 - 1988
Without Collector Plates
|
Need test
|
Annually
|
Rates vary per diesel testing center
|
|
1976 or newer Grandfathered**
|
Exempt
|
n/a
|
n/a
|
|
1975 and older
With Collector Plates
|
Exempt
|
n/a
|
n/a
|
|
1975 and older without Collector Plates
|
Need test
|
Annually
|
Rates vary per diesel testing center
|
|
*Transition from biennial to annual testing is based on the MSO (Manufacturer Statement of Origin) date of the vehicle. See local County DMV for more information.
|
** Vehicles model year 1976 or newer that have been registered as a "collector's item" prior to September 1, 2009, and the registration has never lapsed or expired or had a change of ownership.
|
- Can I register my diesel vehicle online?
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Yes. Effective June 1, 2017 all diesel vehicles that do require a passing emission test (Boulder, Jefferson, Broomfield, Denver and Douglas Counties, and portions of Adams, Arapahoe, Larimer, Weld and El Paso counties) are eligible for online renewal.
- Locations
-
Diesel emission testing facilities charge up to one-hour of the posted labor rates, so fees will vary. Contact the specific station for fees.
