Plumbers & Steamfitters UA Local 400 is comprised of approximately 2,300 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 355,000 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. Click to visit the United Association website.


To be the preferred choice for industries, employers and workers in plumbing, steamfitting, pipe fabrication, marine pipefitting, and HVACR service in Northeast Wisconsin.


UA Local 400 operates a referral system that supplies qualified manpower to our signatory contractors. This is a skill-based referral system with the primary purpose of providing the contractor/customer with the craft person that possesses the necessary skills for specific job requirements. All UA Local 400 members are required to participate in our substance abuse testing program. All referrals are filled on a non-discriminatory basis.  UA Local 400 follows the UA Standard for Excellence and the UA Standard for Safety policies.

Community Services

The members of UA Local 400 take pride in being a part of and helping to serve our communities. This can be seen in our involvement with and contributions to such organizations as the Cerebral Palsy Telethon, Special Olympics, Rebuilding Together and the Salvation Army, to name a few. The Local also partners each year with the Mechanical Contractors Association and area businesses to run the “Heats On Program”. This program provides for the inspection of home heating systems including any needed repairs and the installation of carbon monoxide and smoke detectors in homes of low-income elderly in Brown, Outagamie and Fond du Lac Counties – all at no cost to the homeowner.