Since 1906, the O.C. McDonald Company has been Santa Clara County’s leading Plumbing, Process Piping, Heating, Ventilation, Air Conditioning and Service Contractor. Founded by Oren Charles McDonald, the company is currently run by 4th generation, James McDonald, the great grandson of the founder.

We’ve held on to our old-fashioned values, but we’re constantly exploring new technology and procedures to allow us to serve our clients well into the 21st Century.