Everyone at Major Plumbing Co. Inc. is committed to our vision of being the best in all aspects of our business by cultivating a culture of trust, responsibility, accountability, high expectations and open communication with our employees, customers, and suppliers support. Important plumbing company. Inc. has been serving our water and wastewater customers for two generations. Our team of dedicated employees makes us one of the best plumbing companies in Southern California. We have built our reputation on an experienced workforce of highly skilled workers. We confidently offer fast and professional services that set high standards for quality, reliability, durability, and value.