Clean Truck Check Credentialed Tester

Clean Truck Check in Marshalltown, IA

1 credentialed tester in Marshalltown.

Testers in Marshalltown

Nearest in-person tester to Marshalltown

The closest CARB-credentialed Clean Truck Check tester is QSC in Des Moines, Iowa — about 42 miles away (straight-line). Smart CTC tests over the truck’s OBD port from anywhere, with no drive and no appointment.

Trucking activity in Marshall County

Clean Truck Check applies to heavy-duty vehicles that operate in California — including out-of-state trucks based here that run loads west.

Trucking establishments
20
Trucking employees
87

Source: FMCSA MCMIS carrier census, US Census County Business Patterns 2021.

Freight corridors near Marshalltown

Marshalltown sits on US-30, IA-14, IA-146, IA-224, IA-330 and IA-96. Trucks running these routes into California fall under CARB’s Clean Truck Check — Smart CTC lets them test remotely without leaving the road.

Source: OpenStreetMap (© OpenStreetMap contributors).

Nearby truck stops

OpenStreetMap-tagged truck stops, services areas, and HGV-marked fuel stations within 25 miles of Marshalltown. Useful for routing a service stop around your CTC test.

+1 more within 25 miles.

Source: © OpenStreetMap contributors. Last updated 2026-05-26.