Clean Truck Check Credentialed Tester

Clean Truck Check Testers in Washington

14 CARB-credentialed testers across 11 cities.

Cities with credentialed testers

Testers in Washington

All cities & towns in Washington

Trucking activity in Washington

FMCSA MCMIS reports 24,800 active motor carriers registered with operations in Washington. The Clean Truck Check program reaches the heavy-duty subset that operates in California, which is why this directory exists.

Interstate carriers
17,200
Intrastate carriers
7,600
Hazmat carriers
1,300
Passenger carriers
620
Heavy-duty power units
73,200
Medium-duty power units
14,800

Source: FMCSA MCMIS Registration Statistics. Snapshot 2024-10-01. Last fetched 2026-05-18.