Middlesex Water Co. owns and operates regulated water utility and wastewater systems. The firm's services include water production, treatment, & distribution, full service municipal contract operations, wastewater collection and treatment. Read More It operates through two segments: Regulated and Non-Regulated. The Regulated segment serves residential, commercial, industrial and municipal customers. The Non-Regulated segment engages in business activities with developers, government entities and other customers. The company was founded in 1897 and is headquartered in Iselin, NJ. The listed name for MSEX is Middlesex Water Company Common Stock.