HPS Mechanical, Inc. is headquartered in Bakersfield, California with a branch office location in San Diego, CA. Other central areas of operation include Fresno and the Central Coast. HPS Mechanical Inc. was founded as Harry's Plumbing Service in 1959 by Harry DenHerder and was purchased in 1976 by Harry's son, Les DenHerder. Since then HPS has expanded into new construction, pipeline, engineering and plumbing design services in Southern California. We are a progressive company dedicated to taking on difficult projects with a unique blend of expertise and today's leading plumbing technologies. Invest in yourself and team up with us today! The Best Employees.. The Best Tools.. The Best Customers!