An Alaska plumbing license is really a state “certificate of fitness” (COF). Alaska certifies plumbers statewide through its Department of Labor, but there is no state master plumber license. Running a plumbing business takes a separate mechanical administrator license and contractor registration through the Department of Commerce.
Who issues the license
Plumber certificates of fitness come from the Alaska Department of Labor and Workforce Development, Mechanical Inspection Section, under Alaska Statutes Title 18, Chapter 62 and 8 AAC 90. The main office is in Anchorage, with Juneau and Fairbanks offices open by appointment. The section prefers email at mi@alaska.gov.
Mechanical Inspection covers plumbing work in communities of 2,500 or more people and says a state COF is required everywhere in Alaska except those smaller communities. In the Municipality of Anchorage, local inspectors handle plumbing inspections, but the certificate still comes from the state.
The business side belongs to the Alaska Division of Corporations, Business and Professional Licensing, which issues mechanical administrator licenses and registers mechanical contractors.
Requirements change, so always confirm with the Alaska Department of Labor and Workforce Development, Mechanical Inspection Section before you apply. This page is a plain-English guide, not legal advice.
License types
- Plumber Trainee. Code work under direct supervision of a journeyman. You must be in a registered apprenticeship. Good for 6 years, with no more than two trainees per journeyman on a job site.
- Plumber Utility Trainee. Supervised utility work only (water service, building sewer, and storm lines). No apprenticeship needed. Your employer sends a notarized letter instead.
- Plumber Journeyman. The full certificate, covering work under the state’s adopted Uniform Plumbing Code, including fuel gas piping. Good for 2 years.
- Plumber Restricted PG. Fuel and gas piping within the property lines only.
- Plumber Restricted PU. Water service, building sewer, and certain storm drain piping only.
- Provisional Plumber Journeyman. A short-term certificate for plumbers licensed in another state.
There is no master plumber license. Mechanical Inspection’s FAQ says holding both a journeyman COF and a mechanical administrator license works much like a master license does elsewhere.
How to become a plumber in Alaska
The path runs trainee, then journeyman, then mechanical administrator if you want to run jobs or a company.
- Step 1: Join an apprenticeship. Find an employer to sponsor you in a U.S. Department of Labor registered apprenticeship. Your employer prints your registration letter from the RAPIDS system.
- Step 2: Get your Trainee COF. Send the trainee application and that letter to Mechanical Inspection. Processing takes about 7 to 10 business days. You can’t earn qualifying hours without it.
- Step 3: Log 8,000 hours. Hours count only if you worked for a properly licensed contractor, under direct journeyman supervision, on code work. Maintenance work doesn’t count.
- Step 4: Apply and test for journeyman. Submit the application with your experience verification forms, and the section schedules your exam.
- Step 5 (optional): Become a mechanical administrator. The Unlimited Commercial and Industrial Plumbing category requires journeyman plumber or plumbing superintendent experience for at least 4 of the 6 years before you apply. Residential Plumbing and Hydronic Heating requires journeyman experience in that work for 2 of the last 4 years.
Up to 1,000 classroom hours from a registered apprenticeship or accredited program can replace work hours. No more than 500 PU hours and 2,000 PG hours count toward journeyman. The FAQ says vocational and military hours are accepted starting in 2025, capped at 4,000 hours for journeyman, with 500 hours per year of qualifying military service.
PG needs 4,000 hours of plumbing plus 2,000 hours of gas piping. PU needs 1,000 hours on water, sewer, or storm lines. Have your employer sign an Experience Verification Form every six months or on your last day.
Exams
Journeyman, PG, and PU exams are given at the division’s Juneau, Anchorage, and Fairbanks offices. You can ask in writing to test elsewhere, and the department may send you to an approved third-party site or proctor at your cost. An Alaska union can also give its own exam under an agreement with the department.
You need 70 percent to pass, and you can retake 30 days after a failed attempt. The regulations don’t publish question counts, time limits, or reference books, so ask when you schedule.
The mechanical administrator exam is separate. It’s given by PSI, the passing score is 70 percent, and your score must be from within the 12 months before you apply.
Cost and fees
- COF application fee. $50, nonrefundable.
- Trainee certificate. $200.
- Journeyman certificate. $200 new or renewal, prorated if issued for less than 2 years.
- Duplicate certificate. $25.
- Provisional journeyman. $150 total.
- Mechanical administrator by exam. $350 total ($150 application plus $200 license), plus PSI’s exam fee.
- Mechanical contractor registration. $350 total ($100 application plus $250 registration).
Mechanical Inspection takes cash, checks, and major cards. There is no paid expedite option.
Renewal and continuing education
Journeyman certificates last 2 years. You can renew up to 90 days early by emailing a renewal application to mi@alaska.gov. The certificate stops being valid for code work the day it expires, but you can renew without retesting within 2 years after expiration.
Journeyman renewal requires 16 hours of approved continuing education in the prior 24 months. At least 8 hours must cover changes to the Uniform Plumbing Code, and no more than 8 can be industry related. Trainee certificates renew with proof you’re still in an apprenticeship.
Mechanical administrator licenses expire December 31 of odd-numbered years and require at least one 8-hour continuing education workshop per period, unless you passed a licensing exam during it.
Bond, insurance, and business registration
A journeyman COF has no bond or insurance requirement. To register as a mechanical contractor, you must be, or employ, a licensed mechanical administrator, and you need:
- Surety bond. $10,000 under AS 08.18.071.
- Liability insurance. At least $20,000 property damage, $50,000 injury to one person, and $100,000 injury to more than one person.
- Workers’ comp. Required if you have employees or are a corporation or LLC.
- Business license. A separate state business license, obtained after registration.
Reciprocity
As of August 8, 2025, Mechanical Inspection accepts Plumber Journeyman reciprocity applications from other U.S. states without a mutual agreement. It weighs whether your jurisdiction is substantially similar, looking at work hours, testing, and apprenticeship rules. No list of approved states is published.
The provisional certificate is the fast route. You must have held your out-of-state license for a full year. It lasts one year or until your home license expires, whichever comes first. You must carry both licenses, can’t do gas work, and can’t supervise trainees. If your state isn’t found substantially similar, you’ll need to prove hours and pass the Alaska exam.
How to apply
- Get the form. Download the trainee, journeyman, experience verification, or renewal application from Mechanical Inspection.
- Gather proof. Attach notarized experience verification forms, employer letters, or a union affidavit.
- Pay. $50 application plus $200 certificate.
- Submit. Email mi@alaska.gov or mail it to the Anchorage office. Incomplete applications are rejected.
- Test and carry your card. Take the exam when scheduled, and keep the certificate on you while working.
FAQ
Does Alaska have a master plumber license?
No. Plumber Journeyman is the top individual certificate. A mechanical administrator license covers supervision and sign-off but doesn’t let you do code work by itself.
Can I work while my certificate is processing?
Not on code work. You can do other work for your employer or classroom study while you wait.
Does the journeyman certificate cover gas piping?
Yes, the journeyman definition includes fuel gas piping. The Restricted PG certificate is for people who only do gas. Provisional holders can’t do gas work.
What if I work without a certificate?
An inspector can order you to stop. Under state law, both worker and employer can face a misdemeanor with a fine of up to $500.
Next steps
Just starting? Line up a sponsoring employer and a registered apprenticeship, then file for your Trainee COF so your hours count from day one. To compare Alaska with other states, see our plumbing license by state page and the full plumbing license guide. Coming up from the Lower 48? The Washington plumbing license page is a good comparison for another certificate-based system. Ready to run your own shop? Read how to start a plumbing business.
