Yunnan Water Investment Co., Limited, an investment holding company, designs, develops, constructs, operates, and maintains municipal water supply, and wastewater and solid waste treatment facilities in the People's Republic of China and internationally. It operates through Wastewater Treatment, Water Supply, Solid Waste Treatment, Construction and Sales of Equipment, and Others segments. The company constructs and operates wastewater treatment projects, water supply projects, and solid waste treatment projects; and produces, sells, and installs equipment for wastewater treatment, water supply, solid waste treatment, and other infrastructure facilities. In addition, it undertakes operate transfer, build own operate (BOT), transfer operate (BOO), transfer-operate transfer(TOT), transfer own operate(TOO), build and transfer(BT), engineering procurement construction(EPC), rehabilitate operate transfer, operation(ROT), and maintenance related projects. As on 31 December 2022, it had 128 concession wastewater treatment projects, including 7 BOO, 65 BOT, 2 TOO, 25 TOT, 1 ROT, and 28 environment treatment projects. The company was formerly known as Yunnan Water Industry Investment and Development Co., Ltd. Yunnan Water Investment Co., Limited was founded in 2009 and is headquartered in Kunming, the People's Republic of China. The company operates as a subsidiary of Yunnan Green Environmental Protection Industry Group Co., Ltd.