Iowa Plumber License Requirements (2026)

Iowa licenses plumbing professionals and plumbing contractors statewide through the Iowa Plumbing and Mechanical Systems Board (PMSB) under Iowa Code chapter 105. A Master Plumber is an individual credential in the plumbing discipline. A business that provides chapter 105-covered plumbing services by contract must also hold a PMSB contractor license and DIAL contractor registration, with an active Master Plumber as master of record for its plumbing work. State licensure does not replace locally administered permits, inspections, or project-specific local code requirements.

Regulatory Body

Iowa Plumbing and Mechanical Systems Board (PMSB) is the statutory authority responsible for issuing and enforcing this license under Iowa Code chapter 105; Iowa Administrative Code 481—Chapter 23. The Board licenses and regulates plumbing and mechanical trade licensees and contractors in Iowa.

• Official portal: https://dial.iowa.gov/about-dial/boards-and-commissions/pmsb-board
• Address: 6200 Park Avenue, Suite 100, Des Moines, IA 50321
• Phone: 866-280-1521

Eligibility Requirements

Applicants must be at least 18 years old. Applicants must provide a Social Security Number. Iowa DIAL requires U.S. citizenship or lawful-presence verification through SAVE; the current master-license page does not list an Iowa-residency requirement.

Good moral character

Applicants must document criminal convictions. The Board reviews applicants with felony convictions to determine licensure eligibility.

Background investigation

The application requires documentation of criminal convictions; the published master requirements do not describe a separate fingerprint-based background check.

Experience and Education

The experience bar is 2 years of To sit for the master examination, hold either a master license from another jurisdiction or a journeyperson license with at least two years of journey-level work experience., and it must be backed by verifiable records — typically payroll, tax, project, or supervisor documentation covering the claimed period.

Accepted proof of experience or eligibility

• DIAL Exam Approval Application
• Documentation supporting the qualifying license and experience requested by DIAL
• Criminal-conviction documentation, if applicable

Education substitution

The published master-level requirements list an out-of-jurisdiction master license or a journeyperson license plus two years of journey-level experience. Confirm any military-training or other alternative basis with DIAL before applying.

Exam Requirements

Testing provider or authority: Kirkwood Community College, the PMSB-approved testing provider. The following examination requirements cover the pathways described in this guide; follow each part's classification, waiver, and local-scope conditions. Unpublished format details do not remove an examination requirement:

• Iowa PMSB Master Plumber examination — question count: confirm with the authority, timing: confirm with the authority, passing score: confirm in the current candidate bulletin

Examination fee: $35 exam-approval application fee per discipline, then a current $95 examination fee per attempt paid to Kirkwood.

Retake policy: DIAL’s current public page confirms a fee for each examination attempt. Obtain current scheduling and retake instructions from Kirkwood after DIAL approves the Exam Approval Application.

Insurance and Bonds

A $5,000 surety bond, in the form prescribed by the PMSB, must be posted as a condition of licensure.

General liability

An applicant for the PMSB contractor license must provide public-liability coverage of at least $500,000 from an insurer authorized to do business in Iowa, with at least 10 days’ written notice to the Board before cancellation. This is a contractor requirement, not an individual Master Plumber requirement.

Workers' compensation

For contractor registration, a contractor with one or more employees must submit proof of workers’ compensation coverage or, if self-insured, a Certificate of Relief. The contractor application also requires unemployment-insurance compliance information.

Additional financial requirements

A PMSB contractor applicant must provide a $5,000 surety bond from an entity authorized to do business in Iowa; it must give at least 10 days’ written notice to the Board before cancellation. DIAL separately describes an out-of-state contractor-registration bond requirement.

Fee Schedule

To turn these board fees into a realistic year-one budget — bond premium, liability insurance, and exam prep included — open the cost calculator preloaded for Iowa plumber.

Renewal and Continuing Education

The Iowa Master Plumber License and Contractor License runs on a 3 years renewal cycle. The current renewal fee is $240. PMSB licenses expire June 30 and are valid through August 31; DIAL advises renewing in July to avoid fees. Check DIAL’s current fee schedule for proration or late-fee details.

Continuing education: At least eight hours of Board-approved classroom instruction during each three-year licensing term. Both the instructor and course must be pre-approved by the Board.

Reciprocity

For this classification, Iowa does not recognize the NASCLA Accredited Examination.

The current PMSB master-license page documents reciprocity only for South Dakota plumbing licenses obtained by written examination. Confirm eligibility directly with DIAL before relying on reciprocity.

Weighing more than one jurisdiction? The national hub compares published Plumber license requirements by state — exam, bond, fee, and experience thresholds side by side.

Plumber Licensing in Neighboring States

Contractors working near a state line, or weighing where to qualify first, should compare Iowa's requirements against the bordering jurisdictions before committing to an application:

• Illinois Plumber License Requirements — Illinois Licensed Plumber and Plumbing Contractor Registration
• Minnesota Plumber License Requirements — Minnesota Master Plumber and Plumbing Contractor License
• Missouri Plumber License Requirements — Missouri Plumber — City and County Licensing
• Nebraska Plumber License Requirements — Nebraska Plumber — City or Village License
• South Dakota Plumber License Requirements — South Dakota Plumber and Plumbing Contractor
• Wisconsin Plumber License Requirements — Wisconsin Master Plumber

Step-by-Step Application Roadmap

1. Choose the correct individual license path. For a Master Plumber exam, qualify through a master license from another jurisdiction or a journeyperson license plus at least two years of journey-level experience.
2. Submit the Exam Approval Application. File DIAL’s Exam Approval Application and pay the $35 fee per trade discipline. DIAL advises allowing up to two weeks for a complete application to be processed.
3. Schedule the approved examination. After approval, schedule with Kirkwood Community College at one of its Iowa testing sites and pay the current $95 examination fee for the attempt.
4. Apply for post-examination master licensure. After passing, submit the post-examination licensure application and pay the prorated master-license fee.
5. Apply for a contractor license if the business contracts for plumbing work. File the PMSB contractor-license application and DIAL registration information. Provide the required master of record, $500,000 public-liability insurance, $5,000 surety bond, business information, and required compliance documentation.
6. Obtain local permits and inspections. Before project work begins, confirm the permitting, inspection, and local-code process with the authority having jurisdiction.
7. Renew and complete continuing education. PMSB licenses have a three-year term. Complete at least eight hours of Board-approved classroom continuing education during each term.

Application Checklist

Ahead of submission to PMSB, confirm every item on this short list:

• Qualifying journeyperson license plus two years of journey-level experience, or a master license from another jurisdiction
• DIAL Exam Approval Application and $35 fee per discipline
• Kirkwood examination payment ($95 per attempt, current posted amount)
• Post-examination master-license application and prorated license fee
• For a contracting business: PMSB contractor-license/DIAL-registration application, master of record, $500,000 public-liability evidence, and $5,000 surety bond
• Local permit and inspection confirmation for each project

Progress is saved in this browser, so you can return to this checklist while your application is in flight.

Common Filing Mistakes

These are the recurring mistakes that most often delay or reject a Iowa Plumber application, based on the official instructions cited here.

Assuming an individual master credential authorizes a business

The individual Master Plumber license is separate from the PMSB contractor license and DIAL contractor registration required for a business providing covered plumbing services by contract.

Applying before the two-year journey-level requirement is met

The current master-exam eligibility route based on a journeyperson license requires at least two years of journey-level work experience.

Omitting the contractor bond or insurance

A PMSB contractor applicant must submit at least $500,000 public-liability coverage and a $5,000 surety bond, among other requirements.

Treating state licensure as the final project approval

Check locally administered permits, inspections, and project-specific code requirements before starting work.

Missing continuing education

Each PMSB license requires at least eight hours of Board-approved classroom continuing education during every three-year licensing term.

Study and Reference Materials

The list below collects the board's cited references and the materials applicants typically study from. CLR is not paid to recommend any of them.

• Iowa PMSB examination information — Iowa DIAL. Start with DIAL’s current exam page and the instructions provided after exam approval.
• Iowa Code chapter 105 — Iowa Legislature. State framework for plumbing and mechanical licensing.
• Iowa Administrative Code, agency 481 — Iowa Legislature. Current administrative rules publication for the agency.

Other Iowa Trade Licenses

Looking at a different trade? CLR also publishes these Iowa licensing guides:

• Iowa General Contractor License Requirements
• Iowa Electrician License Requirements
• Iowa HVAC Technician License Requirements
• Iowa Roofing Contractor License Requirements
• Iowa Painting Contractor License Requirements
• Iowa Landscaping Contractor License Requirements
• Iowa Masonry Contractor License Requirements
• Iowa Concrete Contractor License Requirements
• Iowa Carpentry Contractor License Requirements
• Iowa Solar Installer License Requirements
• Iowa Low-Voltage Technician License Requirements
• Iowa Fire Sprinkler Contractor License Requirements
• Iowa Home Inspector License Requirements
• Iowa Pool Contractor License Requirements
• Iowa Handyman License Requirements
• Iowa Pest Control License Requirements
• Iowa Septic Contractor License Requirements

Frequently Asked Questions

Does Iowa license plumbers statewide?

Yes. PMSB licenses plumbing professionals under Iowa Code chapter 105. A business that provides covered plumbing services on a contractual basis must also meet the PMSB contractor-license and DIAL-registration requirements. Local permits and inspections can still apply.

How do I qualify for the Iowa Master Plumber examination?

DIAL lists two routes: a master license from another jurisdiction, or a journeyperson license with at least two years of journey-level work experience. You must also meet the general application requirements.

Who administers the Iowa Master Plumber examination?

After DIAL approves the Exam Approval Application, the current master-license page directs applicants to schedule with Kirkwood Community College, the PMSB-approved testing provider. The posted examination fee is $95 per attempt.

What does an Iowa plumbing contractor need?

The business needs a PMSB contractor license and DIAL registration, an active Master Plumber as master of record for plumbing work, at least $500,000 public-liability coverage, a $5,000 surety bond, and the other published business and compliance information.

Does Iowa have plumber reciprocity?

The current PMSB page documents a South Dakota plumbing reciprocity agreement for examination-based journeyperson and master licenses. The page states additional conditions, including a non-Iowa residential address at the time of application.

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