UA Local 398, the Benchmark for Productivity

Serving the San Gabriel Valley, Pasadena, El Monte, Rancho Cucamonga, Pomona, Ontario, Corona, and surrounding communities, United Association Local Union 398 offers a wide range of technical skills that are valued throughout the construction industry.

Our members are the piping professionals who provide our community with the complex piping systems that are responsible for potable water, sanitary systems, medical gas, heating, cooling, and high-purity piping for the pharmaceutical and manufacturing industries, along with an array of other services.