How to Add Hazmat to an Existing CDL
Add Hazmat to a CDL you already hold: complete ELDT, pass the TSA check, pass the state knowledge test, get the H added.
The 4-step process to add Hazmat
Adding Hazmat to a CDL you already hold is a defined four-step sequence: complete Hazmat ELDT, schedule TSA fingerprinting via IDEMIA Universal Enroll, pass the state Hazmat knowledge test, and have your DMV add the H endorsement after TSA clears you. Because the ELDT requirement took effect February 7, 2022, any driver adding Hazmat today must complete the ELDT step first.
The TSA clearance is the longest part — typically 30–45 days — so start your background check early and use that window to study for the knowledge test. For the federal overview, see the main-domain How to Get a Hazmat Endorsement page.
Hazmat ELDT is theory-only and one-time
Hazmat ELDT covers classroom theory only — there is no behind-the-wheel requirement for the H endorsement, unlike CDL Class A or B training. You can complete the DLA Hazmat ELDT course online for $20, and your provider submits the completion to the FMCSA Training Provider Registry. Wondering if a $20 course is real? See Is $20 ELDT Legit?.
You complete Hazmat ELDT exactly once. The record on the Training Provider Registry is permanent — it never expires and is never retaken, even at your 5-year renewal. We explain that distinction in Does ELDT Expire? and How Long Is a Hazmat Endorsement Good For?.
Costs, timing, and what comes next
Plan for three line items: the Hazmat ELDT course ($20 at DLA), the TSA threat assessment (about $86.50, or ≈$41 with a valid TWIC), and any state DMV endorsement fee. Total Hazmat cost typically lands around $110–$150 depending on your state, over a timeline of roughly 6–10 weeks.
If you also want Passenger (P) or School Bus (S) endorsements, the 3-Endorsement Bundle ($50) covers all three ELDT courses together. Not sure which to add? Compare them in Which CDL Endorsement Should I Get?. Once your H endorsement is active, your next milestone is the 5-year TSA renewal — see How to Renew a Hazmat Endorsement.
Start here ($20 each)
Pillar guides
Other answer guides
Hazmat pages by state
Bundles cost less than the same courses bought one at a time, and every price below is the bundled price.
Not sure which one? Every bundle is listed here, with what each one contains.
Tanker and Doubles/Triples need no ELDT at all
There is no ELDT requirement for the Tanker (N) or the Doubles/Triples (T) endorsement. The federal rule covers Class A, Class B, the B-to-A upgrade, and Hazmat, Passenger and School Bus — and nothing else. Both are knowledge-test only at your state DMV. If you want to study for the Tanker test, Tanker Test Prep is $15; if you need the Hazmat ELDT alongside it, Hazmat & Tanker Complete is $45.
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