CDL Combined HazMat/Tanker Endorsement
The X endorsement combines the Hazardous Materials (H) and Tanker (N) endorsements into a single designation. It is required for drivers who transport hazardous materials in tank vehicles, such as gasoline tankers, diesel fuel delivery trucks, liquid chemical transports, and liquefied gas haulers. The X endorsement is the highest-paying endorsement combination in trucking and creates access to the most specialized and lucrative freight.
Requirements
What you need to qualify for and obtain the Combined HazMat/Tanker (X) endorsement.
CDL Test Study Topics
Focus your study time on these key knowledge areas for the X endorsement written test.
- All HazMat topics (classes, placarding, shipping papers, emergencies)
- All Tanker topics (liquid surge, tank types, inspections)
- Specific handling procedures for hazardous liquids in tanks
- Vapor recovery systems and environmental compliance
- Emergency shutoff procedures for hazmat tanker incidents
- DOT and EPA regulations specific to hazmat tanker operations
Jobs That Require the X Endorsement
Earning Potential
Annual Pay Boost
+$8,000 - $20,000/year
Demand Level
Very High
Drivers with the X endorsement earn +$8,000 - $20,000/year more annually than non-endorsed CDL holders. The very high demand ensures consistent job availability and strong negotiating leverage.
Top States for X-Endorsed Drivers
These states have the highest demand for drivers with the Combined HazMat/Tanker endorsement.
Frequently Asked Questions
How much more do X-endorsed drivers make?
X-endorsed drivers earn $8,000-$20,000 more annually than standard CDL-A holders. Fuel tanker drivers with X endorsements commonly earn $70,000-$90,000 at established fuel distribution companies. This is the single highest-paying endorsement combination available.
Is the X endorsement hard to get?
You need to pass two written tests (HazMat and Tanker) and complete a TSA background check. The tests are manageable with study, but the TSA process adds 4-6 weeks. The real barrier is the U.S. citizenship/permanent resident requirement for the HazMat portion.
Do I need to get H and N separately before getting X?
No. You can test for both HazMat and Tanker at the same DMV visit. Once you pass both, your CDL will show the X endorsement. Some drivers get just the H or N first and add the other later, which also results in the X designation.