The Plumbers Union (UA): What It Is and How Membership Works

When someone says the plumbers union, the pipefitters union, or simply the UA, they mean the same organization: the United Association, the union of the North American pipe trades, which dates its history to 1889.

It is the organization union plumbers belong to.

By its own count, the UA represents approximately 409,000 plumbers, pipefitters, sprinkler fitters, HVACR service technicians, welders, and related trades across North America.

That count is the UA's own figure, and it includes workers in Canada as well as the United States.

What the union actually does for a union plumber happens at two levels.

The United Association is the international body; the day-to-day side — the agreement you work under, the training program you enter, the people who answer your questions — lives at the local union, which is the next stop on this page.

If you are still deciding on the trade itself rather than the union, start with our plumber career guide first; this page assumes you know what the work is and want to understand the union side of it.

The UA's own list of its trades is broader than its nickname suggests.

On its site, the union lists: HVACR service technicians, metal trades, pipefitters, pipeliners, plumbers, sprinkler fitters, steamfitters, and welders.

So the phrase plumbers and pipefitters union is accurate but incomplete.

The same union organizes steamfitters who work on high-pressure systems, sprinkler fitters who install fire protection piping, pipeliners, welders, and HVACR service technicians — the union side of the HVAC trade.

If you meet a unionized plumber, a union pipefitter, and a union steamfitter at the same job site, all three may be members of the same union.

Each of those crafts has its own career path, though, and the differences between them are about scope of work.

We keep separate guides for the pipefitter career guide, the steamfitter career guide, and the sprinkler fitter career guide, plus the HVAC side in our HVAC technician guide.

UA members join through a local union — the UA local, or the plumbers local, that searchers look up by name.

The local is where membership becomes real: it is the unit that represents the tradespeople in its jurisdiction, works with the signatory employers in its area, runs its apprenticeship intake, and administers the terms its members work under.

Two UA locals can run genuinely different operations — different pay terms, different dues, different entry rules — because each one governs its own jurisdiction.

How many locals the UA has, exactly where each local's jurisdiction starts and stops, and how mechanics like out-of-work lists and travel cards operate were not confirmed by our research, and they vary by local.

We will not quote a local count or a specific local's rules for that reason; the reliable answer for every one of those questions is your local itself.

Above the local, unions usually organize members into larger regional or district bodies, but how the UA draws its own map was not something our research confirmed either — ask the UA or your local how its structure above the local level works.

What matters for a prospective member is simpler: there is a local for the pipe trades where you live or work, and it — not the international — is who you deal with.

There are two routes into UA membership, and they suit two different readers.

The first route, and the one with the most public documentation, is the apprenticeship.

UA apprenticeships are registered with the U.S. Department of Labor, and the UA describes its registered apprenticeships as including 2,000 hours of paid on-the-job training per year plus 216 hours of related classroom instruction — the UA's page does not say whether the 216 classroom hours are per year, so treat the classroom figure as a program detail to confirm.

The pattern matches the trade at large: BLS says most plumbers, pipefitters, and steamfitters learn their trade through a 4- or 5-year apprenticeship, with 2,000 hours of paid on-the-job training plus technical instruction each year.

You earn a wage while you train, and classroom work runs alongside the on-the-job hours.

Our plumbing apprentice guide covers what the apprenticeship years look like day to day.

The second route is for plumbers who already work the trade: organizing in.

Unions organize existing non-union workers into membership, and experienced plumbers can sometimes join UA locals this way.

But the mechanics — how experience is credited, what testing or evaluation applies, which classifications organize in — were not confirmed by our research, and they vary by local.

An experienced plumber's first call is still the local, not an application form.

In both cases the entry point is local.

Application windows, aptitude testing, prior-experience credit, and the terms of membership are run by the local's own program, so the process you read about online may not be the process your local runs this year.

Dues are the first thing prospective members ask about, and the honest answer is that there is no national number.

Each local sets its own dues and initiation fees, and our research did not confirm specific amounts for UA locals.

Whatever figure you see quoted for the plumbers union in general is someone else's local's number — yours will be in your local's bylaws, and the local will tell you what it costs right now.

The same goes for benefits and pension.

Union benefit and pension plans are negotiated and administered at the local level rather than handed down as one national package, and we did not verify the details of any specific UA plan.

If you are weighing membership for the benefits, ask the local what its current agreements actually provide — that answer, not a generic one, is the one that will apply to you.

What federal data does show is how common union membership is in the trades around you.

The U.S. union membership rate was 10.0 percent of wage and salary workers in 2025, according to BLS.

In construction and extraction occupations — the group that contains plumbers, pipefitters, and steamfitters — 16.4 percent of employed wage-and-salary workers were union members in 2025, and 17.4 percent were represented by a union.

In installation, maintenance, and repair occupations, the group that contains HVAC mechanics, 12.5 percent were members and 13.6 percent were represented.

In the construction industry as a whole, 11.1 percent were members and 12.0 percent were represented.

On earnings, BLS's union tables show broad occupation groups, not plumbers specifically: in 2025, full-time union members in construction and extraction occupations had median weekly earnings of $1,561 against $1,004 for non-union workers in the same occupation group, and in installation, maintenance, and repair occupations the union figure was $1,571 against $1,140.

Treat those as raw comparisons of broad groups — they are not controlled for occupation mix, region, age, or experience, and BLS publishes no plumber-specific union membership rate or union pay premium for the trade.

Be skeptical of anyone quoting one.

For what plumbers earn overall — union and non-union together — see our plumber salary page for the state-by-state BLS tables.

The practical starting point is the UA itself: the union publishes its overview of the trades and its apprenticeship information at ua.org, and that is where any search for your plumbers local should begin.

Because jurisdictions vary by local, the reliable way to find yours is to ask — the UA's national office or the apprenticeship programs in your area can point you to the local that covers your trade where you live.

Once you have the local in front of you, these are the questions worth asking, because every one of them is answered locally:

• Which local covers your trade where you live or work
• Whether its apprenticeship is taking applications this year, and what entry involves
• What dues and initiation cost, and what they cover
• How it organizes in experienced plumbers, and how prior experience is credited
• What its current agreements provide for benefits and pension

Whether you end up carrying a union card or working merit shop, the hiring happens through the same contractors.

Browse plumber jobs on HVACHires to see who is hiring near you, union and non-union alike.

Career information, not legal or financial advice. Membership terms, dues, benefit and pension provisions, and apprenticeship standards are set by each local union. Confirm the details that matter to you with the local you would join, and check licensing questions with your state licensing board or the city or county where licensing is local.