ISKI Is Urging Citizens to Use Water More Efficiently in Daily Life in Türkiye

Istanbul's water reserves have dropped to a critical level as extreme summer heat and reduced rainfall take their toll, with reservoir levels now at 46.98% as of the end of August. The city had entered 2026 with strong reserves, and spring rains pushed dam levels to around 71% in May, but rising temperatures, evaporation, and increased consumption have since caused a steady decline. The next critical period for Istanbul's water reserves will be autumn.

Forecasts suggest temperatures in September will likely remain above normal, and while there is a chance of increased rainfall, uncertainty remains high. Predictions for the European and Black Sea basins point to hot and relatively dry conditions continuing through August and September, with seasonal rainfall expected to strengthen and bring more precipitation to Istanbul toward October. International meteorological centers' forecasts for the 2026-2027 winter indicate above-normal temperatures across Europe, but no strong consensus exists yet on winter rainfall for Istanbul and the Marmara region.

According to a simulation by ISKI based on current consumption trends and meteorological forecasts, the total dam occupancy rate in Istanbul is projected to be around 30% on December 1, 2026. The amount and timing of autumn rainfall will be decisive in achieving this level. Last year on December 1, Istanbul's dam occupancy stood at 18.27%, making the coming months' rainfall critical for determining the city's reserves entering winter. ISKI is urging citizens to use water more efficiently in daily life.

Recommendations include repairing dripping faucets, replacing leaking reservoirs, shortening shower times, not leaving taps running unnecessarily, and running washing machines and dishwashers only when full. Washing vegetables and fruits in a container, watering plants in the morning or evening, and washing vehicles with a bucket and brush are also cited as water-saving practices. ISKI emphasizes that water conservation is not limited to reducing individual consumption but is a shared responsibility for Istanbul's future.

ISKI General Manager Assoc. Prof. Dr. Şafak Başa said the current level is manageable for meeting Istanbul's water needs but stressed the need for careful and effective management of reserves going forward. Başa noted significant level differences among Istanbul's dams, with some European-side reservoirs particularly low, highlighting the importance of balanced and planned operation of resources.

Başa said that if rainfall falls below expectations, current water management scenarios will be updated and additional measures will be implemented gradually if needed. Measures to reduce consumption may include restricting garden and green area irrigation. On the supply side, activating the second stage of the Cumhuriyet Water Treatment Plant and increasing additional water supply options in the existing system are on the agenda.