Plumbing apprenticeships in Minnesota run as registered programs overseen by the Minnesota Department of Labor and Industry (DLI), the state's federally recognized apprenticeship agency.
Doing plumbing work takes one of three doors: a DLI license, a registered unlicensed plumber registration, or enrollment in a DLI-registered apprenticeship, with unlicensed workers under a licensed journeyworker's or master's direct supervision at all times.
The program our research verified in detail is Plumbers Local 34 in St. Paul: 8,500 hours over five years, plus at least 196 hours of related instruction a year.
Verify before you rely on this
At a glance
Minnesota is a State Apprenticeship Agency (SAA) state: the U.S. Department of Labor recognizes DLI — the Minnesota Department of Labor and Industry — as the agency that registers apprenticeship programs in the state.
Yes — registration or enrollment.
Only DLI-licensed plumbers, DLI-registered unlicensed plumbers, or people enrolled in a DLI-registered apprenticeship may do plumbing work, and unlicensed workers are directly supervised at all times by a licensed journeyworker or master.
Plumbers Local 34 (St. Paul) is the program our research verified: 8,500 hours (five years) of on-the-job training plus at least 196 hours of related instruction a year.
Not established in our research which merit-shop chapters or employers sponsor registered plumbing apprenticeships in Minnesota — ask DLI or the chapter you are considering.
A registered unlicensed plumber can sit the journeyworker exam after four years and 7,000 hours of practical experience, with category minimums and no more than 1,750 hours counted per calendar year; completing a DLI-registered apprenticeship is an alternative route.
Apply to a registered program — Local 34 applicants take a $25 reading/math assessment at Saint Paul College and finish the process by September 30 — or register as a registered unlicensed plumber ($14, no experience); you must be a W-2 employee of a licensed plumbing contractor or registered plumbing employer.
Minnesota's entry registration (the credential formerly called 'apprentice'): no work experience required, a $14 filing fee, renewal every June 30 with 2 hours of code CE, and work only under the direct supervision of a licensed journeyworker or master as a W-2 employee of a licensed plumbing contractor or registered plumbing employer.
A registered unlicensed plumber can take DLI's journeyworker exam after four years and 7,000 hours of practical experience with category minimums; completing a DLI-registered apprenticeship is an alternative route.
Licenses valid only in cities and towns with a population under 5,000.
The master plumber exam requires at least one year as a licensed journeyworker, an equivalent master license from another state, or a restricted master license plus five years as a Minnesota plumbing contractor.
Registered apprenticeship in Minnesota is a state-run system.
Minnesota is a State Apprenticeship Agency (SAA) state: the U.S. Department of Labor recognizes DLI as the agency that registers apprenticeship programs in Minnesota, while in states without a recognized SAA, DOL's own Office of Apprenticeship does that job instead.
The program our research verified in detail is union-side: Plumbers Local 34 (St. Paul)'s apprenticeship.
Our research did not confirm which other Minnesota locals or employers sponsor registered plumbing apprenticeships, so treat Local 34 as the verified starting point and ask DLI what else is registered.
Finishing carries a real licensing payoff: completing a DLI-registered apprenticeship is an alternative route to the journeyworker exam, and graduates of a registered program receive a completion certificate from the registration agency, which is not a trade license.
Registration, yes — and supervision with it.
DLI allows only three kinds of people to do plumbing work: DLI-licensed plumbers, DLI-registered unlicensed plumbers, and people enrolled in a DLI-registered apprenticeship.
A plumbing apprentice enrolled in a DLI-registered program may do plumbing work under direct supervision; anyone else must register as a registered unlicensed plumber, the credential formerly called 'apprentice.'
That registration needs no work experience, costs $14 to file, renews every June 30 with 2 hours of code CE, and the holder must be a W-2 employee of a licensed plumbing contractor or registered plumbing employer.
“Your work is directly supervised at all times by a licensed journeyworker or master plumber.”
The verified program is Plumbers Local 34's apprenticeship in St. Paul.
It involves 8,500 hours of on-the-job training across five years and a minimum of 196 hours of related instruction per year, with a 500-hour probationary period.
Nationally, the United Association says its registered apprenticeships typically last five years and cover plumbing, pipefitting, HVACR, welding and fire protection.
Our research did not confirm any other Minnesota union program, so treat Local 34 as the verified starting point and ask DLI what else is registered near you.
“The apprenticeship program itself currently involves 8,500 hours (five years) of on-the-job training and a minimum of 196 hours of related instruction”
On the non-union side, our research confirmed the national associations but did not confirm a specific Minnesota sponsor.
Associated Builders and Contractors (ABC) describes itself as founded on the merit shop philosophy and reports more than 24,000 members.
PHCC — the Plumbing-Heating-Cooling Contractors Association — offers apprenticeship content through an online learning academy, and its Educational Foundation is an EPA-approved 608 certifying program.
What we could not confirm is the Minnesota layer: which, if any, Minnesota ABC or PHCC chapters, or which individual employers, sponsor registered plumbing apprenticeships.
If a contractor tells you it runs an apprenticeship, ask whether the program is registered and who registered it, and confirm that with DLI before you commit.
Registered apprenticeships pair on-the-job training with related technical instruction — the classroom side.
Federally, the Department of Labor recommends, but does not require, a minimum of 144 hours of related instruction per year of apprenticeship.
At the verified Minnesota program, Local 34 requires at least 196 hours of related instruction per year, and its applicants take the reading/math assessment at Saint Paul College.
Beyond that, our research did not catalog which Minnesota community colleges, trade schools or union training centers deliver plumbing-related instruction, or whether hours transfer between programs — ask each sponsor where its apprentices attend class.
Two doors in.
Door one is a registered program: Local 34 applicants take a reading/math assessment ($25) at Saint Paul College and must finish the process by September 30.
Federal rules set the minimum registered-apprentice age at 16 unless a higher minimum age is set by law, and there is no federal maximum age; sponsors may set other qualifications, so read a program's standards before you apply.
Door two is the employer route: a registered unlicensed plumber registration — no experience required, $14 to file — which requires you to be a W-2 employee of a licensed plumbing contractor or registered plumbing employer.
In a registered program, the sponsor must pay a progressively increasing wage schedule tied to the skills you gain; the federal rule sets no percentage steps, so each program's standards set the pay.
“There is no work experience required to register as a registered unlicensed plumber and the initial filing fee is $14.”
To the journeyworker license: completing a DLI-registered apprenticeship is an alternative route to the journeyworker exam.
The rules past that — the journeyworker hours and exam mechanics, the master rung, renewals, restricted licenses and specialty credentials such as medical gas and backflow — are Minnesota licensing rules rather than apprenticeship rules, so confirm them with DLI before you rely on them.
This page summarizes the Minnesota board pages, statutes, rules and other sources listed below, as read for this state-by-state plumbing apprenticeships series, current as of September 2026.
It is not a substitute for the instructions the Minnesota Department of Labor and Industry (DLI) publishes.
For the rest of the picture in Minnesota, see plumbing licensing in Minnesota and HVAC apprenticeships in Minnesota.
Not necessarily a license: the doors are a DLI license, a registered unlicensed plumber registration, or enrollment in a DLI-registered apprenticeship.
Only those three may do plumbing work, and unlicensed workers must be directly supervised at all times by a licensed journeyworker or master.
The registered unlicensed plumber registration — the credential formerly called 'apprentice' — needs no experience, costs $14, renews every June 30 with 2 hours of code CE, and requires you to be a W-2 employee of a licensed plumbing contractor or registered plumbing employer.
Plumbers Local 34's St. Paul program runs 8,500 hours of on-the-job training across five years, with at least 196 hours of related instruction per year and a 500-hour probation.
On the licensing side, a registered unlicensed plumber can take the journeyworker exam after four years and 7,000 hours of practical experience, or completing a DLI-registered apprenticeship is an alternative route.
Ask each program for its written standards before you sign.
The state side is inexpensive: registering as a registered unlicensed plumber costs $14 with no experience required.
Local 34 applicants take a $25 reading/math assessment at Saint Paul College.
Once you are in a registered program, federal rules require a progressively increasing wage schedule tied to skill, with no percentages set federally — each program's standards set the pay steps, so ask for them in writing.
Yes.
Completing a DLI-registered apprenticeship is an alternative route to the journeyworker exam.
For a registered unlicensed plumber, the journeyworker exam takes four years and 7,000 hours of practical experience, including at least 2,000 hours of water distribution, 2,000 hours of drain-waste-vent and 1,000 hours of fixture installation, with no more than 1,750 hours counted per calendar year.
DLI administers the exam itself — ask for the current details when you apply.
The Twin Cities program our research verified is Plumbers Local 34's apprenticeship in St. Paul.
Our research did not confirm which other Minnesota locals or employers sponsor registered plumbing apprenticeships, so ask DLI what is registered near you.
Statewide — Minneapolis included — only DLI-licensed plumbers, DLI-registered unlicensed plumbers, or people enrolled in a DLI-registered apprenticeship may do plumbing work, with direct supervision for unlicensed workers.
Sources
Sourced from the documents listed above.
Verified September 2026.
This is career information, not legal advice.
Confirm current rules with the Minnesota Department of Labor and Industry (DLI).