Iowa · plumber licensing · verified July 2026
Iowa plumber license requirements
The short answer
As of July 2026, Iowa licenses plumbers statewide through the Plumbing and Mechanical Systems Board (PMSB) under the Department of Inspections, Appeals & Licensing (DIAL), per Iowa Code chapter 105. Tiers are apprentice (must be enrolled in a US DOL-registered apprenticeship), journeyperson (4 years of apprentice experience plus the state exam administered through Kirkwood Community College), master (journeyperson plus 2 years experience plus exam), and contractor (active master license plus separate state contractor registration). Licenses run 3 years with 8 hours of continuing education per term; South Dakota is the only exam-reciprocity state.
Do you need a license to work as a plumber in Iowa?
Iowa licenses plumbers statewide, so one credential is valid across the whole state.
Reciprocity is limited to South Dakota, for journeyperson and master plumbing licenses obtained there by written examination; the applicant must be a non-Iowa resident at application and provide a certificate of good standing. The board also issues specialty licenses (disconnect/reconnect plumbing technician, medical gas piping certification, hearth systems, HVAC service technician, private school/college routine maintenance). Base (non-prorated) license fee amounts are set in 481 Iowa Admin Code ch. A $20 fee applies to license verifications.
What licenses does Iowa issue?
The Iowa Plumbing and Mechanical Systems Board (PMSB), Department of Inspections, Appeals & Licensing (DIAL) issues the credentials below for this trade. Boards often list further classes for specialties and business licenses; these are the ones this page covers.
Hours are what each class asks for on its own terms. Where a senior class shows fewer than a journeyman, the board is counting time served after the earlier license rather than from the start; the prerequisite column says which.
| License | On-the-job hours | Classroom hours | Exam |
|---|---|---|---|
| Apprentice Plumber | not published | not published | No |
| Journeyperson Plumber | not published | not published | Yes |
| Master Plumber | not published | not published | Yes |
| Plumbing Contractor | not published | not published | No |
Source: Iowa Plumbing and Mechanical Systems Board (PMSB), Department of Inspections, Appeals & Licensing (DIAL) (dial.iowa.gov). Verified July 2026.
What exam does Iowa require?
Iowa Journeyperson Plumbing Examination. Administered by Kirkwood Community College (15 testing sites statewide) on behalf of the Plumbing and Mechanical Systems Board. Exam fee $99.
Iowa Master Plumbing Examination. Administered by Kirkwood Community College on behalf of the Plumbing and Mechanical Systems Board. Exam fee $95.
How much does an Iowa plumber license cost?
Getting a Journeyperson Plumber license in Iowa costs $493 in board fees, before any training. That is the application fee, the exam fee and the initial license fee charged once, for an applicant licensed at the start of the fee cycle. No board publishes this total, so it is added up here from the schedule it does publish.
- Application fee$35
- Exam fee$99
- Initial license fee$358.5
How often do you renew, and what continuing education is required?
Renewal period: 3 years, all PMSB licenses expire June 30 of the cycle year (remain valid through August 31); renew in July to avoid late fees
Continuing education: At least 8 hours of classroom instruction during each three-year licensing term, required for all Plumbing and Mechanical Systems Board licenses.
How does the apprenticeship route work?
Hold the Iowa apprentice license while enrolled in a US DOL-registered apprenticeship program, working under journeyperson/master supervision; 4 years of practical apprentice experience through the registered program qualifies the applicant for the journeyperson exam (US DOL sponsorship agreement details, apprentice ID, start date, sponsor program number, are required on the application).
Which states does Iowa have license reciprocity with?
Iowa appears in 1 published reciprocal licensing agreement for this trade, covering SD. Boards write these as agreements between two states rather than as a one-way list, and some publish the list while their counterpart does not, so this counts every agreement naming Iowa from either side. Recognition is never automatic: the board you apply to decides, and most require the original license to have been earned by examination and to be in good standing.
How does Iowa compare to neighboring states?
Requirements stop at the state line, which matters if you live near one or expect to move. Here is what the neighboring states ask of the same trade.
| State | Journeyman hours | Licensing model |
|---|---|---|
| Iowa | not published | Statewide |
| Illinois | not published | Statewide |
| Minnesota | 7,000 | Statewide |
| Missouri | not published | City or county |
| Nebraska | not published | City or county |
| South Dakota | not published | Statewide |
| Wisconsin | not published | Statewide |
Source: state licensing boards. Verified July 2026.
Sources and verification
Every fact on this page traces to one of these
- Plumbing & Mechanical Systems Licensure - Iowa DIAL (board, CE, renewal cycle)
- Journey Level License - Iowa DIAL
- Master Level License - Iowa DIAL
- Apprentice License - Iowa DIAL
- Contractor License - Iowa DIAL
Last verified July 2026. Found an error? Report it and it will be corrected and logged on the corrections page.
Other states with published requirements for this trade: Kansas, Kentucky, Louisiana.
Price the whole path with the license cost estimator, or weigh earning against paying for school with the apprenticeship comparison. Back to plumbers overview.
Licensing requirements change between our verification sweeps. This page is informational only, so confirm current requirements with Iowa Plumbing and Mechanical Systems Board (PMSB), Department of Inspections, Appeals & Licensing (DIAL) before making decisions. Not legal advice.