State ladder: apprentice → journeyman → master
Idaho Plumbing Board, Division of Occupational and Professional Licenses (DOPL) runs plumbing licensing in Idaho. Below: the exact ladder, the transfer doors into Idaho from all 50 states, the renewal and lapse lines, and the master-of-record rule for opening a company — every figure from the board's own publications, checked October 22, 2026.
State ladder: apprentice → journeyman → master Checked in part Checked October 22, 2026
Checked in part. Current dollar amounts for application, examination, and certificate fees (set by Idaho Code 54-2614/54-2616) were not published on the DOPL pages retrieved on 2026-10-22, so fee fields are null. The reciprocity state list and its holding-period conditions come from DOPL-linked guidance (College of Southern Idaho apprenticeship/licensure page, which follows DOPL) rather than a DOPL agreement page retrieved directly. The ladder, hours, schooling, contractor, CE, and 12-month revival rules are from IDAPA 07.02.05 itself.
| The ladder | Idaho |
|---|---|
| Journeyman credential | Journeyman Plumber |
| Total hours required | 8,000 |
| Classroom hours | 576 |
| Apprentice registration | Required — hours count only while registered |
| Exam | PSI (per DOPL program examinations page) — Written plus practical examination based on the Uniform Plumbing Code. Fee amount not published on the DOPL pages retrieved. |
| License fee | Not published |
| Renewal | Every 3 years (certificates renew on a cycle tied to the holder's birthdate; IDAPA 07.02.05.016) |
| Continuing education | 8 hours per 3-year cycle for journeymen (4 hours must be plumbing code update), or pass a Division exam instead; contractors 16 hours per cycle (IDAPA 07.02.05.016) |
| Master credential | Plumbing Contractor (Idaho's top tier — there is no state 'Master Plumber' title) |
Registration, in the board’s terms: Apprentices must register with the Division before going to work (minimum age 16) and complete Board-approved related instruction for 4 years — a minimum of 144 hours per school year (576 total) with at least a 70% grade average — while working under the constant on-the-job supervision of a journeyman plumber and in the employ of a plumbing contractor (IDAPA 07.02.05.011).
Plumbing Contractor (Idaho's top tier — there is no state 'Master Plumber' title): Hold an active Idaho journeyman certificate and show a minimum of 2.5 years of experience as a licensed journeyman plumber in Idaho, pass the plumbing contractor examination, and file the compliance bond required by Idaho Code 54-2606 (IDAPA 07.02.05.013). A contractor certificate holder represents one firm only.
Out-of-state journeymen must first obtain the Idaho journeyman certificate; 2.5 years of journeyman experience in a recognized jurisdiction can substitute for the Idaho experience. The compliance bond amount is not stated in the rule excerpt retrieved.
Certificates that are not timely renewed expire (IDAPA 07.02.05.016.03).
Reinstatement: An expired certificate may be revived within 12 months of expiration by submitting a completed application, paying the same fee as for an initial certificate, and meeting all other certification requirements (IDAPA 07.02.05.016.03).
Past the line: After 12 months the plumbing rules provide no revival path — the applicant must qualify and apply as a new applicant.
Idaho endorses journeyman licenses from: Montana, Oregon, Washington. Idaho reciprocates at the journeyman level only, with Montana, Oregon, and Washington, for applicants who tested for their license and completed 4 years of schooling and on-the-job training (conditions reported in DOPL-linked guidance: Montana license held at least 1 year; Oregon at least 6 months; Washington applicants must be current Washington residents). All other out-of-state applicants take the Idaho examinations, though their licensed experience counts toward eligibility under IDAPA 07.02.05.012.03.
| Licensed in | Door into Idaho | |
|---|---|---|
| Alabama | No endorsement — exam route | Run the pair → |
| Alaska | No endorsement — exam route | Run the pair → |
| Arizona | No endorsement — exam route | Run the pair → |
| Arkansas | No endorsement — exam route | Run the pair → |
| California | No endorsement — exam route | Run the pair → |
| Colorado | No endorsement — exam route | Run the pair → |
| Connecticut | No endorsement — exam route | Run the pair → |
| Delaware | No endorsement — exam route | Run the pair → |
| District of Columbia | No endorsement — exam route | Run the pair → |
| Florida | No endorsement — exam route | Run the pair → |
| Georgia | No endorsement — exam route | Run the pair → |
| Hawaii | No endorsement — exam route | Run the pair → |
| Illinois | No endorsement — exam route | Run the pair → |
| Indiana | No endorsement — exam route | Run the pair → |
| Iowa | No endorsement — exam route | Run the pair → |
| Kansas | No endorsement — exam route | Run the pair → |
| Kentucky | No endorsement — exam route | Run the pair → |
| Louisiana | No endorsement — exam route | Run the pair → |
| Maine | No endorsement — exam route | Run the pair → |
| Maryland | No endorsement — exam route | Run the pair → |
| Massachusetts | No endorsement — exam route | Run the pair → |
| Michigan | No endorsement — exam route | Run the pair → |
| Minnesota | No endorsement — exam route | Run the pair → |
| Mississippi | No endorsement — exam route | Run the pair → |
| Missouri | No endorsement — exam route | Run the pair → |
| Montana | Endorsement available | Run the pair → |
| Nebraska | No endorsement — exam route | Run the pair → |
| Nevada | No endorsement — exam route | Run the pair → |
| New Hampshire | No endorsement — exam route | Run the pair → |
| New Jersey | No endorsement — exam route | Run the pair → |
| New Mexico | No endorsement — exam route | Run the pair → |
| New York | No endorsement — exam route | Run the pair → |
| North Carolina | No endorsement — exam route | Run the pair → |
| North Dakota | No endorsement — exam route | Run the pair → |
| Ohio | No endorsement — exam route | Run the pair → |
| Oklahoma | No endorsement — exam route | Run the pair → |
| Oregon | Endorsement available | Run the pair → |
| Pennsylvania | No endorsement — exam route | Run the pair → |
| Rhode Island | No endorsement — exam route | Run the pair → |
| South Carolina | No endorsement — exam route | Run the pair → |
| South Dakota | No endorsement — exam route | Run the pair → |
| Tennessee | No endorsement — exam route | Run the pair → |
| Texas | No endorsement — exam route | Run the pair → |
| Utah | No endorsement — exam route | Run the pair → |
| Vermont | No endorsement — exam route | Run the pair → |
| Virginia | No endorsement — exam route | Run the pair → |
| Washington | Endorsement available | Run the pair → |
| West Virginia | No endorsement — exam route | Run the pair → |
| Wisconsin | No endorsement — exam route | Run the pair → |
| Wyoming | No endorsement — exam route | Run the pair → |
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The seat: Plumbing Contractor. Plumbing contracting requires the Plumbing Contractor certificate: an active Idaho journeyman with at least 2.5 years as a licensed Idaho journeyman who passes the contractor examination and files a compliance bond under Idaho Code 54-2606. The designated contractor represents one firm only (IDAPA 07.02.05.013).
Run the owner gate for your situation →
Rules as published by Idaho Plumbing Board, Division of Occupational and Professional Licenses (DOPL) and the statutes it administers, checked October 22, 2026. Board: https://dopl.idaho.gov/plb/plb-program-exams/
