Weber County Emissions Requirements: Exemptions, Testing, and Penalties

If you own a vehicle registered in Weber County, Utah, the emissions requirements are straightforward: most gasoline, diesel, hybrid, and CNG vehicles from model year 1996 and newer must pass a Weber-Morgan Health Department emissions inspection before the DMV will renew the registration. Newer vehicles test every two years; vehicles six years old or older test every year. A short list of exemptions applies, and the county can impose real penalties if you try to work around the rule.¹

Which Vehicles Have to Be Tested

The county regulation applies to gasoline, diesel, hybrid, and compressed natural gas vehicles of model year 1996 and newer that are owned or operated by someone domiciled in Weber County.¹ Government-owned vehicles driven in the county — including those from federal agencies, state departments, and local school districts — are also covered.²

Weight thresholds knock out the heaviest vehicles. Any vehicle with a gross vehicle weight rating above 14,000 pounds is exempt. Gasoline or CNG vehicles from 1996 through 2007 with a GVWR between 10,000 and 14,000 pounds are also exempt. Diesel vehicles from 1997 and older don’t test at all.³ Passenger cars, SUVs, and light trucks almost always fall inside the testing program.

Vehicles That Are Exempt

Before scheduling a test, check whether your vehicle falls into one of the exempt categories:

Vehicles less than two years old, measured by model year as of January 1. For calendar year 2026, that covers 2025 and 2026 model-year vehicles.
Vehicles with a 1995 or earlier model year.
Motorcycles and motor-driven cycles.
Fully electric vehicles, which produce no tailpipe emissions.
Vintage-registered vehicles with a 1982 or earlier model year. Vintage vehicles from 1983 or newer must show proof of collector-specific insurance using Utah form TC-745.
Pickup trucks with a GVWR of 12,000 pounds or less used exclusively for farm operations, provided the registered owner submits a signed statement.
Off-highway vehicles, custom vehicles, novel vehicles, and roadable aircraft.

These exemptions come from Utah state law and the Weber County regulation combined.³²

How Often You Have to Test

Weber County uses two testing cycles based on vehicle age, measured by model year as of January 1:

Vehicles less than six years old test every two years. Even-numbered model years test in even-numbered calendar years; odd-numbered model years test in odd-numbered calendar years.
Vehicles six years old or older test every year. In 2026, that means all 1996 through 2020 model-year vehicles.

The biennial schedule for newer vehicles is authorized by Utah Code and the federally approved State Implementation Plan.² You can complete your inspection no more than two months before your registration renewal date. Testing earlier than that won’t count, and you’ll have to test again.³

Getting Ready to Pass

Bring your current registration or renewal notice. The technician will enter your VIN and current mileage into the testing system.

The single most important check before you go is your dashboard. If the Malfunction Indicator Light (the check engine light) is on, your vehicle will fail the OBD test automatically. The illuminated light signals a stored trouble code that has to be diagnosed and repaired before you can pass.¹

Even with the light off, your vehicle’s internal readiness monitors need to be in a “ready” state. These monitors run self-checks on components like the catalytic converter and oxygen sensors. Disconnecting the battery, clearing trouble codes, or completing major repairs can reset the monitors to “Not Ready,” which also fails the test. A few days of mixed city and highway driving usually resets them.¹

What the Test Actually Involves

The procedure depends on fuel type and model year. Only technicians permitted at a specific station and using department-approved procedures can perform the inspection.⁴

Gasoline and CNG Vehicles from 1996 On

The technician plugs a scan tool into the OBD-II port under the dashboard. The tool reads any stored trouble codes and verifies that the check engine light is functioning. If the light works, no active trouble codes are present, and readiness monitors are complete, the vehicle passes.¹

Diesel Vehicles from 1998 On, 14,000 GVWR or Under

Diesels from 2007 and newer get an OBD-II scan similar to gasoline vehicles. Diesels from 1998 through 2006 get a visual anti-tampering inspection instead. The technician confirms that all factory-equipped emissions systems listed on the vehicle’s emissions decal are present and working, including the catalytic converter, exhaust gas recirculation system, diesel particulate filter, and selective catalytic reduction (urea) system where originally equipped.¹

Passing, and Getting Your Registration Renewed

You don’t need to carry paper to the DMV. Every Certificate of Compliance is transmitted electronically from the Weber-Morgan Health Department to the Utah Division of Motor Vehicles, and the DMV needs that electronic confirmation before it will process a renewal.⁴ Many emissions stations are also “On the Spot” renewal locations, where you can pay the renewal and walk out with new decals right after passing.³

If Your Vehicle Fails

A fail doesn’t reset your wallet. If you go back to the same station that ran the original test within 30 days, reinspections are free. Older vehicles that took a tailpipe test get one free retest; vehicles that took the OBD-II test get two. The original inspection fee covers those retests regardless of the outcome.¹

If repairs still can’t get you a passing result, a repair waiver is the fallback. A waiver lets you register the vehicle for one renewal cycle while the underlying issue is unresolved. It doesn’t carry over — you have to pass or requalify for a waiver at your next renewal.

The general path is: fail an initial inspection, spend money on emissions-related repairs at a licensed facility, then fail a second inspection showing that the repairs at least partially helped. Neighboring counties set the minimum repair spending at $450 for OBD-tested vehicles, and Weber County follows a similar framework. Confirm the exact dollar threshold and paperwork with the Weber-Morgan Health Department at 801-399-7140, because waiver details are set at the county level.

One rule doesn’t bend: a waiver will not be issued if your check engine light is inoperable. The light itself has to work, even when the vehicle can’t pass the full test.¹

If Your Vehicle Is Out of State

Weber County residents whose vehicles are temporarily outside Utah for military service, school, work, or any other reason can request a deferral. You’ll submit an application and documentation showing the vehicle is currently out of state, which lets you renew the registration without a physical inspection.⁵

Once the vehicle comes back to Utah, it must pass an emissions inspection within 10 days of its return. The deferral buys time for registration; it doesn’t erase the testing requirement. Start the process by contacting the Weber-Morgan Health Department at 801-399-7140 or weberemissions@co.weber.ut.us.⁵

Penalties for Skipping or Cheating the Program

Without a valid emissions certificate, waiver, or documented exemption, the DMV will not renew your registration. Driving on expired registration exposes you to citations, and Utah maintains an impound process for vehicles with improper or expired registration.⁶

Utah law also targets a specific dodge. If a county investigates and finds that you registered a vehicle at a false address — for example, at a relative’s address in a county with no emissions program — the county can impose a $1,000 civil penalty.² Counties along the Wasatch Front have the authority to investigate and use it.

Where to Get Tested

Inspections have to be performed at a station approved by the Weber-Morgan Health Department using department-certified equipment.⁴ The department publishes a station list on its website, and the Utah DMV offers an online locator that also flags which stations do On the Spot registration renewal. For questions on testing, exemptions, deferrals, or waivers, call the Weber-Morgan Health Department at 801-399-7140.³

1
Weber-Morgan Health Department. Motor Vehicle Inspection and Maintenance Program Regulation
2
Utah Legislature. Utah Code 41-6a-1642 – Emissions Inspection – County Program
3
Utah Division of Motor Vehicles. Vehicle Inspections
4
Weber-Morgan Health Department. Motor Vehicle Inspection and Maintenance Program Regulation
5
Weber-Morgan Health Department. Out of State Emissions Deferrals
6
Utah Division of Motor Vehicles. Impounds