Darco Water Technologies Limited, an investment holding company, provides engineering, and water and wastewater treatment solutions in Singapore, Malaysia, the People's Republic of China, and Vietnam. It operates through Projects, and Operations and Maintenance Services segments. The Projects segment designs, fabricates, assembles, installs, and commissions engineered water systems for industrial applications; and provides engineered vacuum solution and service concession. The Operations and Maintenance Services segment services and maintains water and wastewater treatment plants, and water supply, as well as trades and supplies of goods comprising chemicals, electrical controls, consumables, and related instruments used in water treatment systems. The company also designs and supplies environmental related equipment, centralized vacuum systems, refuse conveying systems, and other engineering systems; trades in industrial water treatment equipment and spare parts, and chemicals; designs, installs, sets up, and maintains industrial waste treatment plant ultra-pure systems; and tests wastewater and processed water, as well as renders other related waste treatment plant services. In addition, it designs, fabricates, and constructs pure and wastewater treatment plants; trades in vacuum cleaning systems and related services; and provides consultancy services. The company was founded in 1999 and is headquartered in Singapore