Free practice test

Tests

Driving testsCitizenship testsSchool and university admissionsNursing, medicine and healthEnglish and French testsTeachingMoney, law and insuranceTrades and work licencesPilots, drones, boats and radio

Countries

United StatesCanadaUnited KingdomAustraliaNew Zealand

United States · Licensing exam

Iowa plumbing license

Iowa's Plumbing and Mechanical Systems Board, part of the Department of Inspections, Appeals and Licensing (DIAL), issues apprentice, journeyperson and master licenses. Four years in a registered apprenticeship and an open-book exam get you an Iowa plumbing license at journeyperson level.

Free practice test

Updated October 2026 · Written from official sources, listed at the bottom of this page

Iowa plumbing license levels

LicenseWhat you need
ApprenticeAge 18, a high school diploma or GED, and a place in a US Department of Labor registered apprenticeship, working under a licensed journeyperson or master
JourneypersonAge 18 and 4 years of experience as an apprentice (from 2010 on, in a registered program), plus the journeyperson exam
MasterA journeyperson license and 2 years of work experience, or a master license from another state, plus the master exam
Becoming a plumbing apprentice →

What's on the Iowa plumbing license test?

You send the board an exam approval application with $35 per exam. Once approved you register with Kirkwood Community College, which runs the exams at 16 sites around the state, and you can test as often as you need within a year.

The journeyperson plumber exam (with gas) has 75 questions in 3 hours, and the master exam 125 questions in 6 hours. Both are open book, using the 2024 Uniform Plumbing Code and Iowa's 2024 amendment booklet, and you need 75% to pass. Permanent tabs and highlighting are fine; notes and sticky tabs aren't.

Kirkwood lists its fee as $119 per plumbing exam, while DIAL's journey and master pages show $99 and $95. Check the amount when you register with Kirkwood at 319-398-1022.

License fees

All Iowa licenses run on one 3-year period, July 1, 2026 to June 30, 2029, so a first license is charged pro rata. Renewal rules are with the other states.

LicenseFull fee for the 3-year period
Apprentice$50
Journeyperson$180
Master$240
Contractor$250, plus a $150 contractor registration
Plumbing license renewal →
Sources: Iowa DIAL · Kirkwood Community College and 4 more. Checked October 2026.

Rules and fees can change, so check the official site before your test.

Explore

Everything else, in one place

OverviewPractice testWhere to learnCostOnline examStudy guideJourneymanMaster plumberHow to get licensedContractor licenseRenewalLicense lookupDo you need a license?ApprenticeshipAptitude testState boards

By state

CaliforniaIllinoisNew York CityNorth CarolinaTexasVirginiaWashington