Iowa Plumber License Requirements

Official classification: Plumber License (Journey and Master Levels) · Issued by the Iowa Department of Inspections, Appeals, & Licensing (DIAL) - Plumbing & Mechanical Systems Board.

🔧 PlumberIA ✔ Verified 2026-06-26

In Iowa, plumbers must hold the Plumber License (Journey and Master Levels), issued by the Iowa Department of Inspections, Appeals, & Licensing (DIAL) - Plumbing & Mechanical Systems Board, and a $5,000 surety bond is required. Full requirements — experience, exams, fees, insurance, renewal and reciprocity — are detailed below.

How to become a licensed plumber in Iowa

Follow these steps to earn your Plumber License (Journey and Master Levels). Every figure is verified against the Iowa Department of Inspections, Appeals, & Licensing (DIAL) - Plumbing & Mechanical Systems Board; full detail for each step is further down the page.

Build the required experience. Journey Level: 4 years of practical experience from an apprenticeship program registered by U.S. Department of Labor; Master Level: Journey license plus 2 years of work experience, or master license from another jurisdiction
Pass the Iowa Plumbing Journeyperson Examination exam. Providers, passing scores and fees are in the Exams section below.
Secure your surety bond. Iowa requires $5,000 minimum surety bond; the bond must give the board 10 days' written notice before cancellation (per IAC 481-431.3).
Line up insurance. You'll need liability insurance ($500,000 minimum public liability insurance coverage), and workers' compensation coverage.
Clear the background check. Criminal history documentation required with full explanation of any convictions; felony convictions subject to board review for eligibility determination; optional pre-application petition available for background check determination
Submit your application and fees. Apply through the Iowa Department of Inspections, Appeals, & Licensing (DIAL) - Plumbing & Mechanical Systems Board — $180 (prorated based on application timing within 3-year cycle; Journey level) application fee, plus a Included in application fee license fee. Processing time: 4-6 weeks for standard applications; up to 2 weeks additional for exam approval applications.
Keep the license active. Renew every 3 years, completing 8 hours per 3-year renewal period (at least half must be completed in-person classroom instruction).

License types

Journey Level Plumber — Perform plumbing work under journeyperson license classification; may work as employee or contractor with proper insurance/bond
Master Level Plumber — Perform all plumbing work independently as master contractor; supervise other plumbers; operate as independent contractor with required insurance and bond

Requirements at a glance

Experience required	Journey Level: 4 years of practical experience from an apprenticeship program registered by U.S. Department of Labor; Master Level: Journey license plus 2 years of work experience, or master license from another jurisdiction
Application fee	$180 (prorated based on application timing within 3-year cycle; Journey level)
License fee	Included in application fee
Renewal fee	$180 every 3 years (Journey level); $240 for Master level
Renewal period	Every 3 years
Continuing education	8 hours per 3-year renewal period (at least half must be completed in-person classroom instruction)
Bond required	$5,000 minimum surety bond; the bond must give the board 10 days' written notice before cancellation (per IAC 481-431.3).
Liability insurance	$500,000 minimum public liability insurance coverage
Property damage	—
Workers' comp	Required for contractors with one or more employees; self-employed with no employees exempt
Background check	Criminal history documentation required with full explanation of any convictions; felony convictions subject to board review for eligibility determination; optional pre-application petition available for background check determination
Credit requirement	None
Reciprocity	South Dakota
Processing time	4-6 weeks for standard applications; up to 2 weeks additional for exam approval applications

Exams

Iowa Plumbing Journeyperson Examination	Provider: Board-approved testing vendor · Passing: 75% · Fee: $35 board exam-application fee; the vendor's testing fee is paid directly to the vendor

Preparing for the Plumber exam? State-specific contractor exam-prep courses help you pass the first time. Start exam prep →

Local / municipal notes

Iowa has statewide licensing through DIAL; some municipalities may have additional local requirements. Plumbing & Mechanical Systems Board oversees all state-level licensing and requirements.

Frequently asked questions

How much does a Iowa plumber license cost?

Application: $180 (prorated based on application timing within 3-year cycle; Journey level). License: Included in application fee. Renewal: $180 every 3 years (Journey level); $240 for Master level.

Do plumbers in Iowa need a surety bond?

$5,000 minimum surety bond; the bond must give the board 10 days' written notice before cancellation (per IAC 481-431.3).

What experience is required for a Iowa plumber license?

Journey Level: 4 years of practical experience from an apprenticeship program registered by U.S. Department of Labor; Master Level: Journey license plus 2 years of work experience, or master license from another jurisdiction

Is insurance required for plumbers in Iowa?

Liability: $500,000 minimum public liability insurance coverage Workers' compensation: Required for contractors with one or more employees; self-employed with no employees exempt

How often must a Iowa plumber license be renewed?

Every 3 years. Continuing education: 8 hours per 3-year renewal period (at least half must be completed in-person classroom instruction)

Fees and rules change frequently (often annually). This page was last verified on 2026-06-26 — always confirm current requirements directly with the Iowa Department of Inspections, Appeals, & Licensing (DIAL) - Plumbing & Mechanical Systems Board before applying. This is not legal advice.