Washington CDL Endorsements
Endorsements are add-ons to your Washington CDL that authorize specific vehicle types or cargo. Each requires a separate knowledge test, taken through Washington Department of Licensing, and the endorsement codes are federal, so a Washington endorsement is recognized in every state. With port and intermodal freight, aerospace manufacturing, agriculture and produce shaping Washington freight, the examples under each endorsement show where that endorsement pays off locally.
Not all endorsements apply to every CDL class. Use the CDL Selector to find what you need.
When It's Required in Washington
In Washington (WA), required to transport any quantity of hazardous materials that require placarding under federal HazMat regulations.
What to Study for the WA Test
For the Washington (WA) Hazardous Materials test, study shipping papers, placard and label selection, safe loading and segregation, emergency response procedures, and security-awareness requirements under federal law.
Hazardous Materials in Washington (WA)
- Port and intermodal freight: placarded containers and ISO tanks coming through the ports
- Lumber and forest products: roofing, coatings, and compressed-gas deliveries to job sites
When It's Required in Washington
In Washington (WA), required for vehicles designed to transport liquids or gases in a tank permanently or temporarily attached to the vehicle, with individual tank capacity of more than 119 gallons.
What to Study for the WA Test
For the Washington (WA) Tank Vehicles test, study liquid surge and baffled tanks, outage allowances, inspections, high-center-of-gravity handling, and rollover prevention strategies.
Tank Vehicles in Washington (WA)
- Port and intermodal freight: ISO tank containers of chemicals and food-grade liquids
- Agriculture and produce: juice, wine, and liquid food tankers where the crop calls for it
When It's Required in Washington
In Washington (WA), required for commercial vehicles designed to carry 16 or more passengers including the driver: charter buses, transit coaches, and similar vehicles.
What to Study for the WA Test
For the Washington (WA) Passenger test, study passenger safety protocols, controlled loading and unloading, emergency door operation, on-road passenger management, and distracted-driving rules.
Passenger in Washington (WA)
- Agriculture and produce: farm labor crew buses carrying 16 or more workers
- Transit agencies, charter companies, and church or community buses across Washington
When It's Required in Washington
In Washington (WA), required for any driver transporting school-age students in a vehicle classified as a school bus under federal or state law.
What to Study for the WA Test
For the Washington (WA) School Bus test, study student loading zones, stop-signal arm procedures, railroad crossing rules, mirror adjustment, emergency evacuation drills, and state-specific school bus regulations.
School Bus in Washington (WA)
- Washington school districts and their contractors: every route driver needs S plus P
- Activity and athletics trips, which use the same S-endorsed drivers
When It's Required in Washington
In Washington (WA), required to pull double or triple trailers where permitted by state law. Common in regional and long-haul freight operations.
What to Study for the WA Test
For the Washington (WA) Doubles & Triples test, study coupling and uncoupling double and triple combinations, pull-out stability, off-tracking behavior, full combination inspections, and safe following distance.
Doubles & Triples in Washington (WA)
- Port and intermodal freight: twin-trailer LTL sets running the port and rail corridors
When It's Required in Washington
In Washington (WA), required for any vehicle equipped with an air brake system, which covers most Class A tractor-trailers and many Class B straight trucks.
What to Study for the WA Test
For the Washington (WA) Air Brakes test, study air brake components, dual-circuit systems, inspection procedures, warning devices, pressure gauges, and stopping distance at highway speeds.
Air Brakes in Washington (WA)
- Aerospace manufacturing: the heavy-haul tractors and straight trucks on aerospace plant routes
- Lumber and forest products: dump trucks, mixers, and flatbed tractors on construction routes
- Almost every Class A and Class B vehicle in Washington; skip this test and your CDL carries an L restriction
When It's Required in Washington
In Washington (WA), essential for Class A drivers operating tractor-trailers, lowboys, and other multi-unit combinations over federal weight thresholds.
What to Study for the WA Test
For the Washington (WA) Combination Vehicles test, study coupling and uncoupling procedures, air line connections, trailer handling characteristics, off-tracking, and full combination vehicle inspections.
Combination Vehicles in Washington (WA)
- Port and intermodal freight: container drayage between the ports, rail ramps, and warehouses
- Aerospace manufacturing: oversize aircraft sections and aerospace components on specialized flatbed and step-deck trailers
- Agriculture and produce: refrigerated produce loads to distribution centers and out of state
- Lumber and forest products: flatbed and step-deck loads of steel, lumber, and building materials
Not sure which Washington CDL endorsements you need?
Answer a few questions about your vehicle and operation, and the Washington CDL Selector Tool pinpoints the endorsements you need in Washington.