Quick Reference Table
Requirement | Details |
|---|---|
License Types | Apprentice, Journeyperson, Master, Contractor, Specialty (Disconnect/Reconnect, Medical Gas, Hearth, Maintenance, HVAC Service Tech) |
Regulating Agency | Iowa Plumbing and Mechanical Systems Board (PMSB), DIAL (official DIAL PMSB page) |
Experience Required | Journeyperson: 4-year apprenticeship; Master: prior journeyperson/master licensure (+ experience) |
Exam | Journeyperson/Master: Written, proctored, ≥75% to pass; exam approval app ($35/disc), then Kirkwood exam ($99) |
Renewal Cycle | 3 years, every June 30 |
Continuing Education | 8 CE hours (code, discipline, safety); more for multiple licenses, see below |
Fees | Contractor: $41.75–varies, plus $25 reg + $25 paper (as of 2026); Exam app $35, Exam $99; renewal late fees up to $100 (source dates/links below) |
Official Links |
Who Needs a License in Iowa?
Every person or business performing plumbing work in Iowa must hold the correct PMSB license before starting any job. This includes installing, repairing, or maintaining plumbing systems covered by state code such as water, waste, or vent systems.
Most importantly, unlicensed work is not permitted, and penalties may apply. Individual plumbers must hold an apprentice, journeyperson, or master license according to their experience and exam status. To offer plumbing services to the public or bid work, you need a contractor license as a business or entity, with a designated Master of Record.
Employees performing only labor under supervision (e.g., apprentices) must have their own apprentice licenses, and the employing business must be a licensed contractor. Unlicensed laborers cannot independently perform or supervise any code-regulated plumbing task. Be sure to verify project scope, as specialty license rules also apply in certain cases.
Plumbing License Requirements in Iowa: Types
The Plumbing license requirements in Iowa define several license classes with clear lines between them:
Apprentice: For those enrolled in a registered U.S. Department of Labor apprenticeship. Can only work under supervision.
Journeyperson: Must complete at least four years apprenticeship; can perform plumbing work but must be employed by or work under a licensed contractor/master.
Master: Requires experience as a journeyperson or previously licensed master. Masters may supervise, design, and are the only ones eligible as Master of Record for a contractor.
Contractor: For companies or business entities contracting plumbing work to the public. Requires an active Master of Record, business insurance, registration, and bond.
Specialty Licenses: For limited scopes (Disconnect/Reconnect technician, medical gas installer, hearth systems, private school/college maintenance, service tech HVAC). These require specific qualifications detailed by PMSB rules.
Each license type carries unique practice limits. For example, apprentices may not supervise or contract; contractors cannot operate without a Master of Record; journeypersons cannot supervise unlicensed labor. The Plumbing license requirements in Iowa are strictly enforced on these points.
How to Get Licensed in Iowa
To meet Plumbing license requirements in Iowa, you must complete board-approved steps for each license class. Here are the detailed actions for each path:
For Apprentice License
Enroll in a Registered Apprenticeship Program approved by the U.S. Dept. of Labor.
Submit an apprentice license application via the PMSB portal or paper (link below).
Provide evidence of program enrollment and a signed supervision agreement from a master.
Be at least 18 years old and disclose any criminal convictions.
Wait for approval before performing any plumbing work.
For Journeyperson License
Complete a four-year registered apprenticeship (minimum required by state law).
Submit an Exam Approval Application and pay $35 per discipline to PMSB, at least 15 business days before your intended exam date.
Wait for exam eligibility approval (about 2 weeks).
Schedule your exam at an approved site with Kirkwood Community College; pay $99 exam fee per attempt.
Pass the written exam with a score of 75% or higher.
Submit a license application to PMSB, pay a prorated license fee, and include experience and employment documents.
Be at least 18, and answer criminal background questions.
For Master License
Hold a valid Iowa journeyperson license (or master license from another state, if qualified).
Document experience as a journeyperson or master plumber per PMSB requirements.
Apply for exam approval ($35); wait for PMSB clearance (~2 weeks).
Schedule and pay for the master plumber exam at Kirkwood ($99); pass with at least 75%.
Apply for the master license, paying applicable fees, and submit supporting documents.
For Contractor License
Register a business entity with the state of Iowa.
Obtain a UI (Unemployment Insurance) number.
Secure required insurance: public liability ($500,000) and, if employees, workers compensation.
Obtain a surety bond: $5,000 (in-state) or $25,000 (out-of-state applicants).
Designate a Master of Record (active Master, not serving for another contractor, unless explicitly board-approved).
Submit contractor license application online or by paper (paper adds $25 surcharge), paying registration and license fees.
Await board review and response (processing time: typically 4–6 weeks).
Specialty licenses follow similar steps, with requirements unique to the specialty. Always consult the official PMSB page for the application forms and criteria.
Application Requirements
The Plumbing license requirements in Iowa set strict criteria for initial applications. You must gather documents, meet all eligibility standards, and complete the full process or risk denial.
Experience and Age Requirements
You must be at least 18 years old for any license. Journeyperson licenses require minimum four-year apprenticeship proof. Master licenses require prior journeyperson or master status, plus work experience. Contractor applicants must be registered businesses.
Bond and Insurance
Contractor licenses require:
$5,000 surety bond if in-state, or $25,000 for out-of-state applicants;
Public liability insurance of at least $500,000;
Workers compensation insurance, if you employ others.
Document these policies and submit with your contractor license application. Renewal requires maintaining all coverage continuously.
Master of Record Certification
Every contractor must employ or retain an active Master of Record. Usually an in-house master licensee, but can be outside, if approved. They supervise design, install, and compliance, may not serve more than one contractor unless granted a waiver. The board must be notified of any changes within 30 days.
Background Check and Criminal Disclosure
All applicants, including apprentices, journeypersons, masters, and contractors, must disclose past criminal convictions or felonies. Applications with criminal history are reviewed by the board for fitness. You may request a predetermination to address fitness before applying if you have prior convictions. See the PMSB licensure page for more on this disclosure process.
Evidence of Apprenticeship or Equivalent
Journeyperson and master applicants must provide documentation such as:
Completion certificates (for apprenticeship);
Proof of prior licensure (for master);
Work logs or experience summaries, if requested.
Incomplete or inaccurate applications may be delayed or denied. Always review the full checklist provided by the PMSB for your license type.
Exams
Plumbing license requirements in Iowa state that exams are required for journeyperson and master applicants. These are written, proctored, and administered by board-approved providers (primarily Kirkwood Community College).
Here are the exam rules in detail:
Submit Exam Approval Application with $35 fee (per discipline) at least 15 business days in advance.
Exam scheduled directly with Kirkwood, paid per attempt ($99 each).
Bring photo ID to the exam site; exams are generally in-person, with rotating Iowa locations.
The passing score is 75%. Candidates who do not pass within one year must reapply.
Once a passing score is earned, you must apply for licensure within two years or the score expires.
Journeyperson candidates can start the process up to 12 months before completing their apprenticeship.
If you fail twice, you may retake, but a new Exam Approval Application is needed after one year from initial attempt. Exam and eligibility policies can be found at PMSB Journeyperson Info and in the current administrative rules (641-29.6).
Fees
The Plumbing license requirements in Iowa spell out fixed application, exam, license, and renewal fees as determined by the PMSB. All fees below have source confirmation as of 2026. See the official schedule for any updates:
Initial Contractor License: $41.75 (Jan–Jun 2026) plus $25 registration and $25 paper application surcharge if not filed online (as of 2026, see official DIAL PMSB fee table).
Multiple license discount: 30% off license fee for purchasing multiple licenses the same day (online only; not valid for registration or late fees).
Exam Approval Application: $35 per discipline (as of 2026).
Plumbing Exam Fee (Kirkwood): $99 per attempt (as of 2026).
Renewal late fees (individual): $0 up to July 31, $60 if paid in August, $100 if paid Sep–Jun. If expired over a year, must reinstate (cannot simply renew).
CEU Providers: Application fee and details at the PMSB CEU provider page (verify at official CEU information).
For any missing or unusual fees (reinstatement, specialty inactive, etc.), always consult the official DIAL schedule (see link above).
Renewal and Continuing Education
All individual Plumbing licenses in Iowa must be renewed every three years, on a cycle expiring June 30. You must earn continuing education hours and pay all renewal fees before this date. If your license lapses, you risk discipline and cannot perform regulated work until reinstated.
Continuing Education Requirements
The Plumbing license requirements in Iowa require:
8 hours total each renewal period (3 years): 2 hours code, 4 hours discipline-specific, 2 hours safety (Iowa OSHA or equivalent).
If you hold both plumbing and mechanical licenses: 16 total CE hours (2 each for plumbing/mechanical code, 8 discipline, 4 safety).
If you hold two or more mechanical licenses: 14 hours total (2 code, 8 discipline, 4 safety).
Specialty licenses have CEU requirements proportionate to their scope; all must be board-approved courses with certificates of completion and instructor verification.
Courses and instructors must be approved by PMSB. You should submit rosters and certificates with your renewal application. Instructor/course approvals are typically valid for 3 years. If you are late on renewal, additional or cumulative CEUs may apply, and double for mechanical multiple licensees if more than one renewal period is missed (see Renewal page).
Renewal Steps
Complete the required CEUs.
Gather your certificates and instructor verification documents.
Apply online (preferred) or by paper (extra charge for paper forms).
Pay all applicable renewal fees. Late renewal incurs additional fees as detailed above.
Await confirmation before offering or performing regulated plumbing work again.
Reciprocity
Plumbing license requirements in Iowa allow for limited reciprocity and alternative pathways. Iowa holds a formal reciprocity agreement with South Dakota for journeypersons who passed a written exam. You may be eligible for a license via endorsement from another state if you hold a comparable written-exam-based journeyperson or master license.
For other states or special cases, Iowa also offers licensure by verification and by work experience in states without licensing requirements. These processes fall under Iowa Administrative Code Chapter 430. Every alternate pathway is subject to documentation and board approval. Always start by reviewing the official PMSB licensure page and the Alternative Licensure Pathways rules.
Official Links
Always consult these official Iowa PMSB and legislative sources before acting on Plumbing license requirements in Iowa:
You may also use the official DIAL portal for applying, renewing, or checking license status. For industry resources and more guidance, visit the Plumbing licensing resource hub on CloseCrew.
