When shippers package hazardous materials, they must certify that this was done according to the regulations. The only exception is when:

The shipper is a private carrier carrying his or her own product.

Besides the shipping papers and the packages, which two places must show the hazardous material identification number?

On cargo tanks and on other bulk packaging

Why is the shipper required to sign the shipping paper?

To certify that the shipper prepared the shipment according to the regulations

You may park most placarded vehicles within 5 feet of the traveled part of the road for a short time, if your work requires it. Which load may you NEVER park that close to the road?

Division 1.1, 1.2, or 1.3 explosives

A truck is carrying hazardous materials but does not have the required placards. When may it be moved?

During an emergency, to protect life or property

A bulk package has been unloaded, but the residue of a hazardous material is still inside. Which statement about placards is true?

The bulk package and the vehicle carrying it must still be placarded.

You are hauling Division 1.1, 1.2, or 1.3 explosives. What is a safe haven?

An approved place to park an unattended vehicle loaded with explosives

Under what circumstances may a shipper shorten (abbreviate) the proper shipping name or hazardous material identification number on a shipping paper?

Only if regulations specifically authorize the shipper to do it

You may allow another person to watch your vehicle only when it is:

on the property of the shipper, carrier, or receiver

In Column 1 of the Hazardous Materials Table, what does the symbol "G" mean?

Identifies a generic shipping name, which must be accompanied by the material's technical name on the shipping paper

CDL training yard with trucks and students

Iowa HazMat CDL Practice Test

Practice for your HazMat CDL exam with questions based on the official Iowa CDL handbook

Updated: August 2026

What's on the Iowa HazMat CDL test

Answering from memory beats re-reading — retrieval practice roughly doubles what you remember a week later. These free questions are modeled on the official HazMat CDL knowledge test.

Questions: 30
To pass: 24/30 correct (80%)
Updated: June 2026; 100% free

The Iowa CDL HazMat test follows the AAMVA standard used by most states: 30 questions, with 24 correct answers (80%) needed to pass. A CDL learner's permit in Iowa costs $12 (Iowa Department of Transportation (Iowa DOT) fee schedule, June 2026).

Start the practice test

All Iowa CDL tests

The Iowa HazMat test is one section of the Iowa CDL knowledge exam. For the full set — general knowledge questions, every endorsement section, and Iowa’s permit requirements in one place — go to the Iowa CDL permit practice test.

Other Iowa CDL Practice Tests

Iowa General Knowledge Iowa Combination Vehicles Iowa Air Brakes Iowa Tanker Iowa Doubles & Triples Iowa Passenger

All HazMat CDL Practice Tests

HazMat Practice Tests in Nearby States

Illinois HazMat Practice Test Minnesota HazMat Practice Test Missouri HazMat Practice Test Nebraska HazMat Practice Test South Dakota HazMat Practice Test Wisconsin HazMat Practice Test

More free CDL practice tests

About the HazMat Test in Iowa

The HazMat endorsement test is required in Iowa for drivers who transport hazardous materials. It covers placarding, labeling, loading procedures, emergency response, and compliance with federal hazmat regulations. A TSA background check is also required.

The HazMat test is part of the CDL written exam administered by the Iowa Department of Motor Vehicles. You must pass this test along with the other required written tests to receive your Commercial Learner's Permit (CLP) in Iowa.

Our practice questions are built from the official Iowa CDL handbook and federal FMCSA regulations. Each question includes a detailed explanation to help you understand the material, not just memorize answers.

Iowa HazMat endorsement facts

Iowa CDL facts, each with its official source
Fact	Value	Source
Hazardous materials (H) endorsement fee	$5State fee only — the TSA threat-assessment fee is paid separately to TSA	iowadot.gov
Haz-mat/tank combination (X) endorsement fee	$10Requires both the tanker and the hazardous-materials knowledge tests plus the fingerprint-based threat assessment	iowadot.gov
Card reprint when an endorsement is added off-cycle	$10Charged on top of the endorsement fee if you add it outside your regular renewal period	iowadot.gov
Card-payment surcharge	$1.50 when paying by credit cardCounty locations may charge an additional convenience fee	iowadot.gov
Out-of-county surcharge	$10 may apply at a county office outside where you liveSet by the county, not the Iowa DOT	iowadot.gov
Minimum age	18 for an Iowa CDL; 21 to drive a commercial motor vehicle in interstate travel	iowadot.gov
Interstate driving-record check	Run for every CDL applicant; must show you are eligible for commercial licensing in all other states	iowadot.gov
Entry-Level Driver Training (ELDT)	Required for a first Class A or B CDL, for CDL upgrades, and for the H, P and S endorsementsIowa DOT confirms your record on the FMCSA Training Provider Registry before it will test you	iowadot.gov
Pass mark	Stated as questions you may miss: 10 of 50 (general knowledge), 6 of 30 (hazmat), 5 of 25 (air brake), 4 of 20 (combination, passenger, school bus, doubles/triples, tank)	iowadot.gov
Hazmat knowledge test	30You may miss 6	iowadot.gov
Tank endorsement knowledge test	20You may miss 4	iowadot.gov
Where to take the knowledge test	Any Iowa DOT DMV or county treasurer location, by appointmentMore sites are listed on the CDL Testing Locations page	iowadot.gov
Minimum CLP holding period	14 daysELDT must also be satisfied before the skills and drive test	iowadot.gov
What a CLP cannot do	No hazmat load, no tank vehicle with un-purged hazmat residue, no cargo in a tank, no passengers and no cell phone use	iowadot.gov
Endorsements a CLP can carry	Passenger (P), school bus (S) and tank vehicle (N) onlyHazMat and doubles/triples go on the CDL, never on the permit	iowadot.gov
Self-certification	Four categories — non-excepted interstate, excepted interstate, non-excepted intrastate, excepted intrastate — chosen every time you receive a CDL product	iowadot.gov
Medical certificates	Digital in Iowa — your examiner submits the certificate electronicallyeffective October 23, 2025	iowadot.gov
Licensing agency	Iowa Department of Transportation (Iowa DOT), Motor Vehicle Division	iowadot.gov
HazMat knowledge test	Taken at the DMV and required again at every HME renewalThe endorsement is not issued or renewed until both the test and the TSA background check are done	iowadot.gov
TSA fingerprint-based background check	Required every five years	iowadot.gov
ELDT before the hazmat test	First-time HME applicants must complete ELDT before taking the knowledge test	iowadot.gov
How to apply for the threat assessment	Online or through the HazPrint help desk on 855-347-8371 — the application and fee must be done before you are fingerprintedYou cannot fill the application in at the fingerprinting site	iowadot.gov
Proof of status for the endorsement	Extra identification — a U.S. passport or birth certificate — to prove citizenship or permanent residency	iowadot.gov
After TSA clears you	Bring the results letter to a DMV appointment to have your license issued with the endorsementCall the HazPrint help desk if the letter has not arrived after six weeks	iowadot.gov
Renewing with a hazmat endorsement	Must be done in person, because the hazmat knowledge test is retaken each renewal	iowadot.gov
Farm-service alternative to the H endorsement	A restricted CDL covers liquid fertilizers (3,000 gallons or less) and solid fertilizers for farm-related service industries, with no CDL knowledge or driving testValid up to 210 days a calendar year, within 150 miles of the place of business	iowadot.gov
What the hazmat test covers	Recognizing, handling and transporting hazardous materials	iowadot.gov
If TSA finds a security threat	TSA notifies you and the state denies issuance of the endorsementThe check covers criminal, immigration and FBI records	iowadot.gov
TSA security threat assessment fee (federal)	$85.25Non-refundable; paid to TSA, not the stateeffective January 1, 2025	tsa.gov
TSA reduced fee (valid TWIC holders, where the state accepts it)	$41	tsa.gov
TSA clearance validity	5 years	tsa.gov
When to enroll with TSA	At least 60 days before you need the endorsementTSA says some applications take more than 45 days	tsa.gov
Combination hazmat/tank (X) endorsement	For tank drivers hauling placarded hazardous materials — both the tank and hazmat knowledge examinations	iowadot.gov

How to add the HazMat endorsement in Iowa

If this is your first hazmat endorsement, complete Entry-Level Driver Training before you take the HME knowledge test. Source
Apply for the TSA threat assessment through HazPrint — online or by calling the help desk on 855-347-8371 — and pay the $85.25 application fee before you go to be fingerprinted. Source
Get fingerprinted at a HazPrint site, bringing two forms of ID, then wait for TSA’s results letter — call the help desk if it has not arrived after six weeks. Source
Take the hazmat knowledge test at the DMV — 30 questions, 6 of which you may miss. Iowa requires the test again at every HME renewal, and the endorsement is not issued until both the test and the background check are done. Source
Bring the TSA letter and proof of citizenship or permanent residency to a DMV appointment to have the license issued with the endorsement, and pay the $5 hazardous-materials endorsement fee (plus $10 for a new card if you are adding it outside your renewal period). Source

Official Iowa Department of Transportation (Iowa DOT), Motor Vehicle Division links

As of September 2, 2026, verified against Iowa Department of Transportation (Iowa DOT), Motor Vehicle Division.

Iowa CDL questions

How many questions are on the Iowa CDL knowledge tests?: Iowa DOT publishes the count and the number you may miss for each test: general knowledge 50 (miss 10), combination vehicle for Class A 20 (miss 4), air brake 25 (miss 5), hazmat 30 (miss 6), and tank, passenger, school bus and doubles/triples 20 each (miss 4). There is also a 25-question Iowa operator test where it applies. Source
What does Iowa require for a hazmat (H) endorsement?: Entry-Level Driver Training first if it is your first HME, then the TSA threat-assessment application through HazPrint (online or on 855-347-8371) and fingerprinting, then the 30-question hazmat knowledge test at the DMV. Iowa charges $5 for the endorsement — $10 for the haz-mat/tank X combination — plus $10 to reprint the card if you add it outside your renewal period. The knowledge test is retaken at every renewal and the TSA check repeats every five years, so a hazmat CDL cannot be renewed online. Source
How old do you have to be to get a CDL in Iowa?: The minimum age for an Iowa CDL is 18, but you must be 21 to operate a commercial motor vehicle in interstate travel. Under 21 you are limited to driving inside Iowa, and self-certifying to an intrastate category adds a “K” restriction to the license. Source

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