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 sale 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; desalination plants; and solid waste treatment plants for sanitary landfills, secure landfills, and production of refuse derived fuel. The company was incorporated in 1982 and is headquartered in Bangkok, Thailand.