Thessaloniki Water Supply & Sewerage Co S.A., operating as EYATH S.A., provides water supply and sewerage services in Greece, offering design, construction, and management of water systems. Their work includes desalination, pumping, treatment, waste management, and electricity generation from water sources. Established in 1998, the company is headquartered in Thessaloniki, Greece, as a subsidiary of Hellenic Corporation of Assets and Participations S.A.