U.A. Local 393 Plumbers, Steamfitters and HVAC/R Service Technicians, Plumbing, Mechanical, Industrial and Service & Maintenance Contractors

Quality-Assured Contractors

South Bay Piping Industry contractors and their UA Local 393 members have literally been a part of every major construction project in Silicon Valley. U.A. Local 393 Plumbers and Pipefitters was established over 100 years ago here in Silicon Valley and many of our contractors are being led by 4th and 5th generation family members.

We Built This Valley!

About Us

Learn more about South Bay Piping Industry on the About Us page


Visit the Contractors page to learn more about our members


Visit our News page to see the latest News & Events

Contact Us

Send us an email via the online form on the Contact Us page

Highlighted Projects

Check out some high-profile projects completed by South Bay Piping Industry contractors and Local 393 members.

Mills Peninsula Hospital

Mills Peninsula Hospital

Levi’s Stadium

Children’s Discovery Museum

squaw valley construction

Squaw Valley

Apple Park Cupertino

Apple Park Campus

San Jose City Hall

San Jose City Hall

We Built This Valley

Over 100 years of building experience

Latest News

New Covid protocols for the construction industry, Local 393 members and employers can be found on the Santa Clara County Public Health

This Adventure Called California

August 18th, 2022|

Labor Trafficking Survivor Hopes Short Documentary Film Will Help Protect Other Workers - Film will be part of San Jose's Cinequest this year with a panel discussion to include Ruth Silver Taube, Legal Services Chair

South Bay Piping Industry

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