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Statewide programSources checked Oct 7, 2026

Connecticut emissions testing rules

Connecticut tests most vehicles every two years at privately owned test centers across the state. The test fee is $20.00, a late fee applies after the due date, and vehicles younger than four model years or model year 2001 and older are exempt.

Where testing is required

The state requires testing on most vehicles; there is no county limit.

“The State of Connecticut requires testing on most vehicles.”

How often

Each eligible vehicle gets a recurring due date every two years; passing on time sets the next due date two years later.

“DMV's policy, in accordance with Connecticut Law (C.G.S. 14-164c), is to assign emissions-eligible vehicles a biennial recurring due date.”

What it costs

The emissions test costs $20.00. Every test center takes cash; some take checks or cards.

“The emissions test fee is $20.00. All test centers accept cash as a form of payment.”

Exemptions

Exemptions include vehicles younger than four model years, model year 2001 and older, 10,001 pounds GVWR or more, fully electric vehicles, motorcycles, farm vehicles, titled composite vehicles, bicycles with motors, vehicles not designed primarily for highway use and diesel Type II school buses under 10,000 pounds GVWR.

“The following vehicles are exempt from the Connecticut Emissions Program:”

  • “Vehicles younger than four model-years old”
  • “Model year 2001 and older vehicles”
  • “Vehicles with a gross vehicle weight rating of 10,001 pounds or more”
  • “Composite Vehicles (vehicle must be titled as a composite vehicle, pursuant to Section 14-103a of the C.G.S.)”
  • “Full electric-powered vehicles (non-hybrid)”
  • “Bicycles with motors attached”
  • “Motorcycles”
  • “Certain vehicles registered but not designed primarily for highway use”
  • “Farm vehicles”
  • “Diesel – Powered Type II School Buses; (under 10,000 lbs. GVWR)”

Registration and enforcement

A $20 late fee is charged when a vehicle is not tested within thirty days after its inspection period ends, or not retested within sixty days of a failure.

“The commissioner shall assess a late fee of 20.00 dollars against the owner of a motor vehicle that has not presented such motor vehicle for an emissions inspection within thirty days following the expiration date of the assigned inspection period”

  • “or that has not presented such motor vehicle for a reinspection within sixty days following a test failure, or both.”

Where to get tested

Tests are done at privately owned service facilities certified by the program; you get a postcard at least 45 days before the due date.

“You will receive an official notification postcard at least 45 days in advance of your vehicle inspection due date.”

Connecticut emissions testing questions

Does Connecticut require emissions testing?

Yes. Statewide program. The state requires testing on most vehicles; there is no county limit.

How often is the emissions test in Connecticut?

Each eligible vehicle gets a recurring due date every two years; passing on time sets the next due date two years later.

How much does an emissions test cost in Connecticut?

The emissions test costs $20.00. Every test center takes cash; some take checks or cards.

Which vehicles are exempt in Connecticut?

Exemptions include vehicles younger than four model years, model year 2001 and older, 10,001 pounds GVWR or more, fully electric vehicles, motorcycles, farm vehicles, titled composite vehicles, bicycles with motors, vehicles not designed primarily for highway use and diesel Type II school buses under 10,000 pounds GVWR.

Sources

Every quotation above is checked word for word against our saved copy of the page, on the date shown. Rules change; if a page has moved or says something different, tell us at the corrections page.