Serving the Pipe Trades of Northeast Wisconsin

The members of UA Local 400 take pride in being a part of and helping to serve our communities.


Programs include pipe fabrication, plumbing, steamfitter construction and steamfitter service (HVAC-R).


A wide range of pipe trade certifications from welding and inspection to valve repair, CPR and rigging.


World-class training in two state-of-the-art facilities with full-time training coordinators on staff.


Our pledge to maintain the highest standards of excellence and safety in all that we do.

Recognized Throughout The Industry

A recent survey revealed that 93% of our signatory contractors view UA Local 400 as an asset to their business. This results from the strong working relationship between union members and firms that hire them which has become a trademark of our organization. Here’s what a few of them had to say:

It’s making my job easier because I know we have skilled, highly trained and very dependable workforce, with an attitude, and work ethic that’s second to none that I’ve ever seen.
Tim Becker, Team Industries
One of the advantages that I find being a union contractor and employing close to 250 union personnel, the benefit package is very competitive and is administered by the union.
Kim Bassett-Heitzmann, Bassett Mechanical
The J.F. Ahern Co has enjoyed a very close working relationship with Local 400 for a long time. It is only through this effective working relationship that we are able to come to the best decisions for the industry. We look forward to continuing our relationship with Local 400 for many more years into the future.
Tony Ahern, J.F. Ahern Co.

December Event

Saturday, December 16th from 11:30 am to 3:30 pm at Super Bowl, Appleton for Local 400 Members and their families. RSVP by Friday, Dec. 8th with Doug!

Click for Event Details

About Us

Plumbers & Steamfitters UA Local 400 is comprised of approximately 2,000 members serving eighteen counties in Northeast Wisconsin. We are a local union that is affiliated with the United Association of Plumbers & Pipefitters, comprised of approximately 345,000 members across the US and Canada. Our main purpose is to provide training for our members and qualified manpower to our 105 signatory contractors for all aspects of the plumbing, pipe fitting, HVACR service, and pipe fabrication industries.

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Our Affiliations

UA Local 400 Logo Veterans In Piping Logo Wisconsin Pipe Trades Logo
Pipe Trades Logo