Hydrotek Public Company Limited, together with its subsidiaries, engages in the construction and management of water treatment and wastewater treatment system, waste management system, and selling of related supplies in Thailand. It is involved in the engineering, procurement, construction, installation, operation, and maintenance of water treatment plants, such as portable water, desalination, and demineralization plants; wastewater recycle and wastewater treatment plants; solid waste treatment plants for sanitary landfills, secure landfills, and production of refuse derived fuel; and using wastewater with chemical oxygen demand. The company was incorporated in 1982 and is based in Bangkok, Thailand.