Plumbers & Steamfitters Local 159 was chartered into the United Association on April 3rd, 1915 in Martinez, California. Almost 100 years later, our offices are still headquartered in Martinez where we have our union hiring hall, Journeyman and Apprentice Training facility and assembly hall. With over 500 members and over 100 union contractors, we provide skilled plumbers, steamfitters, HVAC Refrigeration technicians and service plumbers for work in Contra Costa County and beyond.