Tsukishima Holdings Co., Ltd. provides products and services for water and sewer facilities in Japan and internationally. The company offers chemical injection, water treatment, and dehydration equipment, as well as plant facilities including digestion tanks and incinerators; and pressure vessels and heat exchangers. It also engages in the design, manufacture, and construction services for water purification plants, sewage treatment plants, biomass usage facilities, and sludge recycling facilities; operating public-private partnership projects, including project finance initiative, design-build-operate, and digestive gas power generation projects; operational management and repair services to water and sewer facilities. In addition, the company is involved in operations, maintenance, repairs, improvements, and renovations of environmental infrastructures; sale of industrial chemicals; sale of machinery and supplies for environmental equipment; design, manufacture, and sale of plant systems and equipment for advanced fields comprising battery components and life science fields, such as pharmaceuticals, food products, and cosmetics; and waste treatment business; design, manufacture, and sale of equipment to contribute to environmental improvements and various chemical and general industrial equipment. Further, it engages in waste collection, transport, and intermediate treatment, and thermal recycling through alternative energy power generation; and real estate management and leasing. The company was formerly known as Tsukishima Kikai Co., Ltd. and changed its name to Tsukishima Holdings Co., Ltd. in April 2023. Tsukishima Holdings Co., Ltd. was founded in 1905 and is headquartered in Tokyo, Japan.