Short answer: Yes for most vehicles
| Emissions | Emissions test in St. Louis City and St. Louis, St. Charles and Jefferson counties (Gateway Vehicle Inspection Program), generally for 1996+ gasoline and 1997+ diesel vehicles. Franklin County vehicles test only if primarily operated in the covered area. |
|---|---|
| Safety | Safety inspection every two years, except vehicles within 10 model years AND under 150,000 miles. Up to $12 ($10 motorcycles). |
| Safety inspection (max) | $12 Source: Missouri State Highway Patrol MVI FAQs |
| Emissions inspection (max) | $24 Source: Missouri DOR: Additional help resources |
| Find a station | Gateway VIP station search |
Sources: Gateway VIP: Does my vehicle need a test? · Missouri State Highway Patrol MVI FAQs. Checked 2026-10-04.
Stations in Jefferson County
Use the official Gateway VIP station search to find a licensed station near you.
Featured stations: none yet. Paid listings are labeled "Featured · paid placement".
Frequently asked
Do I need an emissions test in Jefferson County, Missouri?
Yes, for most covered vehicles. Emissions test in St. Louis City and St. Louis, St. Charles and Jefferson counties (Gateway Vehicle Inspection Program), generally for 1996+ gasoline and 1997+ diesel vehicles. Franklin County vehicles test only if primarily operated in the covered area.
Do I need a safety inspection in Jefferson County?
Safety inspection every two years, except vehicles within 10 model years AND under 150,000 miles. Up to $12 ($10 motorcycles).