Utah
What is the counties where testing is required for Utah?
For Utah, counties where testing is required is Cache, Davis, Salt Lake, Utah, or Weber counties; program / authority is Emissions Inspection, verified against its source on 2026-08-25.
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. However, because emissions testing facilities are often not available in counties where emissions testing is not required, the air quality administrators from the five emissions-required counties have granted a limited emissions test exemption.
— dmv.utah.gov, retrieved 2026-08-25
- State
- Utah our reading
- Counties where testing is required
- Cache, Davis, Salt Lake, Utah, or Weber counties verified
- Program / authority
- Emissions Inspection
- How often
- 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. also on this page
- Vehicles covered / exempt
- Diesel powered vehicles with model years 1998 – 2021 require an emissions inspection in Utah County. also on this page
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
The same source also states
2026 Salt Lake County Emissions Requirements 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.
— dmv.utah.gov, retrieved 2026-08-25
The same source also states
2026 Davis County Emissions Requirements 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 in this category 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.
— dmv.utah.gov, retrieved 2026-08-25
The same source also states
2026 Weber County Emissions Requirements Vehicles registered in Weber County with model years less than six years old are required to have an emission test once every two years. Vehicles in this category 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.
— dmv.utah.gov, retrieved 2026-08-25
The same source also states
2026 Utah County Emissions Requirements 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 in this category 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. Diesel powered vehicles with model years 1998 – 2021 require an emissions inspection in Utah County.
— dmv.utah.gov, retrieved 2026-08-25
The same source also states
2026 Cache County Emissions Requirements 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.
— dmv.utah.gov, retrieved 2026-08-25
Source
- dmv.utah.govhttps://dmv.utah.gov/register/inspections/