UA pipefitters and steamfitters join through a numbered local, and the number is how the local is listed — Local 602 for the steamfitters serving Washington, DC, Local 74, the plumbers and pipefitters local for Delaware.
Which number covers your area is set local by local, so this directory lists the UA pipe-trades locals our research verified, state by state and region by region, including a note on pipefitter local 597 and the other numbers our sources could not confirm.
How to find your UA local
The United Association is the international union of the North American pipe trades.
By its own count it represents approximately 409,000 plumbers, pipefitters, sprinkler fitters, HVACR service technicians, welders, and related trades across North America, and it lists pipefitters and steamfitters among its trades, alongside plumbers, sprinkler fitters, pipeliners, welders, HVACR service technicians, and the metal trades.
You do not join any of that at the top: you join a local, and the local is where jurisdiction, apprenticeship and working rules live.
What the UA itself is and how membership works is covered in our plumbers union (UA) guide; this page is the map of locals.
The lookup that decides everything else is the UA's own find-a-local directory at ua.org/find-a-local-union.
The listings below were verified against the UA's directory, state apprenticeship records, or the locals' and programs' own pages — and the directory is the place to check for what has changed since.
Jurisdiction is a local matter in the most literal sense: the area a local covers, whether it takes in one city or more than one state — Local 300 spans both Dakotas, and Local 421 covers both Carolinas — and which trades a local covers is the local's answer to give; the tables below name the trade only where their source does.
Our research did not verify a national count of UA locals or a map of their boundaries — the directory and the local itself are the authorities.
Confirm the local before you rely on any list — including ours
UA pipefitter and steamfitter locals by region
This is the directory: the UA local listings our research verified, taken from the UA's own directory, state apprenticeship records, and the locals' and programs' own pages, grouped by region.
It is a directory, not a ranking — the sources we verified do not publish membership counts by local, so no list of the largest locals can be honestly built from them.
Many listings name the local's home city; where a listing says what a local covers or runs, the table says so too, and where it does not, we have not filled the gap.
Some state rows are partial by the source's own wording — wherever a source's list said "including" or "among", the row keeps that hedge.
States absent from these tables are the ones our research did not confirm listings for — the UA's directory is the lookup for those.
Northeast
| State | UA locals listed (home city or area) | Verified apprenticeship note |
|---|---|---|
| Connecticut | Local 777 (Meriden) — the UA local covering the state | — |
| Maine | Local 716, Maine Plumbers and Pipefitters (Augusta) | five-year apprenticeship; applicants must be 18, Maine residents, with a high school diploma or GED |
| Massachusetts | Local 12, Plumbers and Gasfitters (Dorchester/Boston) | DAS-registered 5-year plumbing apprenticeship; 308 apprentices in 2021 |
| New Hampshire | Local 131, Plumbers & Steamfitters (New Hampshire) | 5-year apprenticeship; applications January 1 to May 30, classes start in September |
| Rhode Island | Local 51 (East Providence) | — |
| Vermont | Local 693 (Barre) | — |
| New Jersey | Local 9 (Central NJ), Local 274 (Northern NJ), Local 322 (South NJ), Local 475 — the member locals of the United Association of New Jersey | Local 322 was not accepting applications as of September 29, 2026; it requires one year of residency in its jurisdiction |
| New York | Local 1 (NYC plumbers, Long Island City), Local 638 (NYC steamfitters), Local 13 (Rochester — Western Central New York and the Finger Lakes) | Local 13 runs an apprenticeship program |
| Pennsylvania | LU 27 Pittsburgh, LU 354 Latrobe, LU 420 Philadelphia, LU 449 Pittsburgh, LU 520 Harrisburg, LU 524 Scranton, LU 542 Pittsburgh, LU 600 Reading, LU 690 Philadelphia, LU 692 Philadelphia | — |
Midwest
| State | UA locals listed (home city or area) | Verified apprenticeship note |
|---|---|---|
| Illinois | Local 130, Chicago Journeymen Plumbers' and Technical Engineers (Chicago) | five-year JAC apprenticeship |
| Indiana | Local 440 (Indianapolis), Local 136 (Evansville) | Local 440 accepts applications year-round; Local 136 has an online application |
| Iowa | Local 33, Plumbers and Steamfitters | trains through the Iowa Pipe Trades and HVAC Training Institute, which takes applications online |
| Nebraska | Local 464, Steamfitters & Plumbers (Omaha) — covers Nebraska and 12 western Iowa counties | applications once a year, in the first two weeks of March |
| North & South Dakota | Local 300 (Mandan, ND) — covers both Dakotas | — |
| Ohio | LU 42 Norwalk, LU 50 Toledo, LU 55 Cleveland, LU 94 Canton, LU 120 Cleveland, LU 162 Dayton, LU 168 Marietta, LU 189 Columbus, LU 219 Akron, LU 392 Cincinnati, LU 396 Boardman, LU 495 Cambridge, LU 577 Portsmouth, LU 776 Lima | — |
| Wisconsin | Locals 75, 183 and 601 (Milwaukee), Local 118 (Racine), Local 400 (Appleton), Local 434 (Central Western Wisconsin) | — |
South
| State | UA locals listed (home city or area) | Verified apprenticeship note |
|---|---|---|
| Delaware | Local 74 (Wilmington, office in Newark) — the UA plumbers and pipefitters local for Delaware | — |
| Washington, DC | Local 5 (plumbers, Lanham MD) and Local 602 (steamfitters, Capitol Heights MD) | — |
| Maryland | Local 486, Plumbers and Steamfitters — JATC facilities in Rosedale (Baltimore County) and Hagerstown | registered apprenticeship sponsor since 1962 |
| Virginia | Local 10 (Richmond), Locals 110 and 376 (Norfolk), Locals 272 and 477 (Portsmouth), Local 851 (Hopewell) | — |
| West Virginia | Local 83 (Wheeling), Local 152 (Morgantown), Local 521 (Huntington), Local 565 (Parkersburg), Local 625 (Charleston) | — |
| North Carolina | Local 421 — covers North and South Carolina, headquartered in Charleston, SC, with satellite offices and training centers in Raleigh and Charlotte | runs a JATC apprenticeship |
| South Carolina | Local 421 (North Charleston) | — |
| Georgia | Local 72 (Atlanta) | five-year MTI apprenticeship for the local's plumbers — 8,000 on-the-job hours and 1,200 classroom hours |
| Florida | Local 234 (Jacksonville), Local 123 (home city not stated in the sources we verified) | Local 234 takes online applications; Local 123 recruits year-round for a 5-year apprenticeship at no cost |
| Kentucky | Local 502 (Louisville) | five-year apprenticeship programs |
| Tennessee | the UA's listing includes Locals 17 and 614 (Memphis), Local 43 (Chattanooga), Local 102 (Knoxville), Local 538 (Johnson City), Locals 572 and 702 (Nashville), Local 718 (Oak Ridge) | — |
| Mississippi | Local 436 (Pascagoula), Local 568 (Gulfport, Saucier), Local 619 (Vicksburg) | — |
| Louisiana | Local 60, Plumbers and Steamfitters (New Orleans area) | runs apprenticeship training at its own training facility |
| Arkansas | Local 155 (Little Rock) — covers the state | — |
| Oklahoma | Local 344 (Oklahoma City), Locals 430 and 798 (Tulsa) | — |
| Texas | the UA lists Texas locals including Locals 68 and 211 (Houston), Local 100 (Dallas), Local 146 (Fort Worth), Local 142 (San Antonio), Local 286 (Austin), Local 529 (Waco), Local 404 (Northwest Texas) | — |
West
| State | UA locals listed (home city or area) | Verified apprenticeship note |
|---|---|---|
| Alaska | Local 262 (Juneau), Local 367 (Anchorage), Local 375 (Fairbanks) | — |
| California | the UA's directory lists 26 California locals, including Local 38 (San Francisco), Local 78 (Los Angeles), Local 230 (San Diego), Local 250 (Los Angeles — Gardena), Local 342 (Oakland — Concord), Local 393 (San Jose), Local 447 (Sacramento) and Local 582 (Santa Ana — Orange) | — |
| Arizona | Local 469 (Phoenix) — the UA plumbers and pipefitters local for Arizona | — |
| Colorado | Local 3 (Denver, Aurora), Local 58 (Colorado Springs), Local 145 (Grand Junction), Local 208 (Denver) | — |
| Montana | Local 30 (Billings), Local 459 (Missoula), Local 41 (Butte) | JATC apprenticeship programs — details below |
| Wyoming | Local 192 (Cheyenne) | — |
| New Mexico | Local 412 (Albuquerque) | applications released when the JATC approves them; applicants call in the last week of each month |
| Utah | Local 140 (Salt Lake City) | — |
| Nevada | Local 525 (Las Vegas), Local 350 (Sparks) | 525: registered plumber/pipefitter apprenticeships plus a separate HVAC program, covering Clark and other southern counties; 350: registered pipe fitter, plumber and refrigeration apprenticeships for northern Nevada |
| Oregon | Local 290 (Tualatin) | — |
| Washington | Local 26 (Western Washington), Locals 32 and 699 (Seattle), Local 44 (Spokane), Local 598 (Pasco) | — |
| Hawaii | Local 675, Plumbers and Fitters (Honolulu) | five-year apprenticeship — 10,000 work hours plus ten semesters of classroom |
A note on the numbers that get searched but are not in the tables: we could not confirm Local 597, Local 537, Local 533 or Local 636 in the sources our research verified, so none of them appears above with a city or state attached.
If one of those is your number, the UA's find-a-local directory is the lookup to use, and the local itself is the confirmation.
Trade labels come from the source, not the local's number
Steamfitter locals
Steamfitters are one of the UA's own trade listings, and some locals cover the steamfitting craft specifically while others combine plumbers and steamfitters under one roof.
The steamfitter side of the union itself — which union, how joining works — is covered in our steamfitter union guide.
Here is what the verified listings show on the local map:
- Local 602 — the steamfitters local serving Washington, DC, based in Capitol Heights, Maryland.
- Local 638 — the Enterprise Association of Steamfitters, the NYC steamfitters' union.
- Local 464 — Steamfitters & Plumbers, Omaha, running apprenticeships in pipefitting, HVACR and plumbing for Nebraska and 12 western Iowa counties.
- Combined locals — the verified listings also name Plumbers and Steamfitters locals 486 (Maryland), 60 (New Orleans area), 33 (Iowa), 131 (New Hampshire) and 459 (Missoula), plus Plumbers and Fitters Local 675 in Honolulu, whose JATC Hawaii's labor department registers for plumber, refrigeration/air-conditioning and steamfitter/welder trades.
Two numbers that get typed as steamfitter searches do not come with a verified trade label.
Local 601 appears among the Milwaukee UA locals on the UA's Wisconsin listing, and Local 475 appears among the member locals of the United Association of New Jersey — but neither listing states the local's trade, and Local 475's own pages were not part of our verified sources.
Ask the local; the number alone does not settle it.
What each local's apprenticeship looks like
The frame is national: UA apprenticeships are registered with the U.S. Department of Labor, and the UA describes them 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 that classroom figure is annual, so treat it as a detail to confirm.
The pattern matches the trade at large: BLS says most plumbers, pipefitters, and steamfitters learn the trade through a 4- or 5-year apprenticeship.
Inside that frame, the details are each program's own.
The verified programs show the range.
In Atlanta, UA Local 72's plumbers train through the Mechanical Trades Institute's five-year apprenticeship — 8,000 on-the-job hours and 1,200 classroom hours, finishing with a Georgia journeyman licence plus backflow and medical gas certifications (mti-jatt.org).
In Honolulu, the UA Local 675 apprenticeship is five years: 10,000 work hours plus ten semesters of classroom instruction (plumbershawaii.com).
In Butte, Montana, the Silver Bow JATC with UA Local 41 runs a 5-year plumbing, HVAC, pipefitting and welding apprenticeship with at least 7,500 OJT hours and 450 classroom hours, taking applications twice a year online, while the Billings Piping Industry JATC at UA Local 30's training facility trains plumbers, pipefitters and refrigeration fitters in a five-year program with at least 246 classroom hours per year.
Chicago's Local 130 runs a five-year Joint Apprenticeship Committee plumbing apprenticeship — 4 days on the job plus 1 day of class per week in years 1-3 (plumberslu130ua.com).
Boston's Plumbers and Gasfitters Local 12 runs a DAS-registered 5-year apprenticeship with daytime block training of 40 hours for 6 weeks a year; it had 308 apprentices in 2021.
Intake differs just as much.
Indianapolis Local 440 accepts apprenticeship applications year-round for the 2026-2027 program year (ualocal440.org), and Louisville Local 502 offers five-year apprenticeship programs (lu502.com).
Jacksonville's UA Local 234 takes online applications for its pipe-trades apprenticeship (ua234.com/training), and Local 123 recruits year-round for a 5-year apprenticeship provided at no cost (lu123.com).
Omaha's Local 464 takes applications once a year, in the first two weeks of March; New Hampshire's Local 131 accepts them January 1 to May 30, with classes starting in September; Albuquerque's Local 412 releases applications only when its JATC committee approves them, and applicants call in the last week of each month.
South Jersey's Local 322, which covers Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem and parts of Ocean and Burlington counties, was not accepting applications as of September 29, 2026, and requires one year of residency in its jurisdiction.
Maine's Local 716 asks applicants to be 18, Maine residents, with a high school diploma or GED.
Maryland's Local 486 JATC, a registered sponsor since 1962, publishes its own costs on its apprenticeship FAQ: a $25 application processing fee, a training scholarship with books to buy — about $525 in year one — class two evenings a week September through June, and union dues of $31 a month once working (ualocal486.com).
What you will not find here is a generic UA intake recipe.
Our research verified no standard aptitude-test format, section count or application calendar for UA programs — each local JATC sets its own — and no UA apprentice wage schedule that could be quoted across programs.
The numbers worth having are the ones above, from the specific program, with the program as the source to reconfirm.
For what pipefitters earn across the trade, union and non-union combined, our pipefitter salary page has the BLS tables.
Windows close, requirements change — confirm with the JATC before you apply
Contacting a local
Once you know which local covers your area, the contact itself is ordinary: the local's hall answers jurisdiction, apprenticeship and membership questions directly, and the program pages behind the apprenticeship notes above carry each application's current details.
The questions worth asking in the first call are the ones this page could only answer local by local:
- Does your jurisdiction cover my county or city — and if not, which local's does?
- Which trades does this local cover: pipefitting, steamfitting, plumbing, HVACR?
- When does the apprenticeship take applications, and what does the intake require?
- Is there an application fee, and what does the program cost once I am in?
- If I already work the trade non-union, how would my experience be handled?
Ask the same questions of any local you are weighing, and keep the answers in writing where you can.
The trade itself — the work, the settings, the pay data — is our pipefitter career guide, the working life on the union side of it is our union pipefitter guide, and current openings are on the pipefitter jobs board.
Career information, not legal advice. Jurisdictions, application rules, dues and wages are set by each local union. Confirm the details that matter to you with the local itself and with the UA's find-a-local directory.