Mornos Lake, the main water source for Greece’s Attica region, continues to shrink, according to recent satellite observations. Researchers report that the lake’s surface has decreased by 44% compared with the October average for 2016–2024.

Kostas Lagouvardos, director of research at the Athens Observatory, highlighted the worsening conditions on social media. Despite some early October rainfall, the total annual precipitation for 2025 is the lowest in the past decade, raising concerns about long-term water supply.

Scientists warn that the lake’s decline is accelerating. Lagouvardos noted that reduced snowfall over the last ten years has significantly affected water availability, a trend expected to worsen in the coming months.

To safeguard water supply for 4.5 million residents of Attica, the Athens Water Supply and Sewerage Company (EYDAP) has activated nearby groundwater wells along the Mornos channel. EYDAP President George Stergiou emphasized that the region is not yet in a state of drought, and uninterrupted water delivery remains secure.

In addition, authorities are planning a partial diversion of two Acheloos River tributaries to the Evinos Dam and are implementing a €500 million pipeline replacement program to reduce water losses and strengthen the network.