The first water administration in Istanbul was established in 1869. Water and sewerage services in Istanbul were combined under İSKİ (Istanbul Water and Sewerage Administration) in 1981. A subsidy of Istanbul Metropolitan Municipality, İSKİ is a public body with an autonomous budget. Almost the whole budget income is received from water sales. Its service area covers the whole territory within Istanbul’s borders. Duties of İSKİ • To provide water • To collect, treat and discharge wastewater • To protect water resources Key Figures on Istanbul • Total Length of Water Lines : 22.424 km • Total Length of Waste Water Lines : 22.608 km • Population Served : 16 million • Total Service Area of İSKİ : 9.271 km2 • Total Number of Customers : 6.6 million • Average Daily Water Supply : 2.9 million m3/day • Total number of staff including personnel of subcontractors : 9.813 • İSKİ provides service by 21 potable water treatment plants and 89 waste water treatment. İSKİ is a public institution.