Clean Truck Check Credentialed Tester

Clean Truck Check in Watertown, WI

1 credentialed tester in Watertown.

Testers in Watertown

Nearest in-person tester to Watertown

The closest CARB-credentialed Clean Truck Check tester is DOT Truck and Trailer Repair Co in Big Bend, Wisconsin — about 34 miles away (straight-line). Smart CTC tests over the truck’s OBD port from anywhere, with no drive and no appointment.

Trucking activity in Jefferson 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
79
Trucking employees
466

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

Freight corridors near Watertown

Watertown sits on I-94, US-18, CTH-F, CTH-G, CTH-J and CTH-K. 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 Watertown. Useful for routing a service stop around your CTC test.

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