In 1889, delegates from a handful of feuding local pipe-trades unions met in Washington, D.C., and founded the United Association of Journeymen Plumbers, Gas Fitters, Steam Fitters, and Steam Fitters’ Helpers. The goal was simple and enormous: bind every pipe-trades local in North America into one body that could standardize the craft, protect traveling members, and bargain on equal footing with employers. It would take two decades and a brutal jurisdictional war to secure — but once it did, the UA became one of the most durable building-trades unions on the continent.
“Every fitting, every weld, every line that moves water, steam, or gas through a building — a UA hand put it there.”
From feuding city locals to the backbone of the energy build-out.
Pre-1889
Three Crafts, Many Wars
Plumbers, steamfitters, and gas fitters organized city by city as America laid its first sewer systems and piped in gas and steam heat. Independent locals, no national body, and constant friction over who did which work.
1889
The United Association Is Born
Delegates meet in Washington, D.C., and charter the United Association of Journeymen Plumbers, Gas Fitters, Steam Fitters, and Steam Fitters’ Helpers — uniting every pipe-trades local under one national banner: standardized craft, protected travelers, shared apprenticeship.
1890s-1900s
P.J. Quinlan & the Steamfitters’ War
A bitter jurisdictional fight between plumbers and steamfitters nearly tore the young union apart. It took the intervention of the American Federation of Labor — and leaders like P.J. Quinlan — to finally settle who controlled pipe work and bind the crafts together for good.
1936
Federal Apprenticeship Standards
The UA helps establish federally recognized apprenticeship — the earn-while-you-learn model that made the union pipefitter and plumber a byword for skill, and still trains the trade today.
Postwar
The Peak of the Pipe Trades
The postwar building boom — refineries, power plants, high-rises, industrial expansion — drove the UA to its peak. Pipefitters and welders became indispensable to America’s heavy industry.
2008
Veterans in Piping
The UA launches the Veterans in Piping (VIP) program, placing thousands of transitioning service members directly into journey-track careers in welding and the pipe trades — one of the most respected veteran-to-trade pipelines in the country.
Today
Building the Energy Transition
Around 396,000 members across roughly 274 locals. The UA’s welders and pipefitters are building the LNG export terminals, the data centers, the semiconductor fabs, and the energy infrastructure of the modern era. Quietly, the pipe trades shape the physical backbone of what comes next.
You keep it flowing.
Every mile you tramp to the next call, you’re part of a 130-year brotherhood that started with feuding city locals and built the pipe that runs a continent. Water, steam, gas, and now the energy of the future — the pipe trades move it all.
See who’s hiring →