Utah emissions testing rules

Licensed dealers must make sure vehicles sold to residents of Cache, Davis, Salt Lake, Utah or Weber counties meet emissions testing requirements; those five counties are the testing counties.

“Utah law requires all licensed Utah dealers to assure vehicles they sell to residents of Cache, Davis, Salt Lake, Utah, or Weber counties meet emissions testing requirements prior to issuing a temporary permit.”

• “the air quality administrators from the five emissions-required counties have granted a”

The 2026 tables for Salt Lake, Davis, Utah and Weber counties mark model years 2024 and 2022 (the parity years) and every model year from 2020 back to 1996 as required; 1995 and older vehicles are not required. Utah County also tests 1998 to 2021 diesels.

“Emissions Inspection Requirements Vehicle Model Year Emissions Inspection 2026 Not required 2025 Not required 2024 Status: Required 2023 Not required 2022 Status: Required 2021 Not required 2020 to 1996 Status: Required 1995 and older Not required”

• “Diesel powered vehicles with model years 1998 – 2021 require an emissions inspection in Utah County.”

In Salt Lake, Davis, Utah and Weber counties, vehicles less than six years old test once every two years: even model years in even-numbered years, odd model years in odd-numbered years. Older vehicles follow each county's model-year table (below).

“Vehicles registered in Salt Lake County with model years less than six years old are required to have an emissions test once every two years. Vehicles in this category that have even-numbered model years must have an emissions test in even-numbered years, and vehicles that have odd-numbered model years must have an emissions test in odd-numbered years.”

• “Vehicles registered in Davis County with model years less than six years old are required to have an emission test once every two years.”
• “Vehicles registered in Utah County with model years less than six years old are required to have an emission test once every two years.”
• “Vehicles registered in Weber County with model years less than six years old are required to have an emission test once every two years.”

Cache County does not test vehicles less than six years old; vehicles six years old and older test every two years by model-year parity (its 2026 table: 2020 to 1996, biennial).

“Vehicles registered in Cache County with model years less than six years old are not required to have an emission test. Vehicles six years old and greater that have even- numbered model years must have an emission test in even-numbered years, and vehicles that have odd-numbered model years must have an emission test in odd-numbered years.”

• “Emissions Inspection Requirements Vehicle Model Year Emissions Inspection 2026 to 2021 Not required Currently active requirement: 2020 to 1996 Biennial 1995 and older Not required”

The inspection may be done up to two months before the renewal, and the DMV must receive the result electronically from the county health department before registering the vehicle.

“An emission inspection may be made no more than two months prior to the renewal of the registration. The Division of Motor Vehicles must receive the emission certificate information electronically from the Health Department prior to completing vehicle registration.”