After a critical period of severe water scarcity, the Mornos reservoir regains its lost glory, ensuring the water supply of Attica. The rising water level has once again brought the ghost village of Kallio to the bottom, ending the alarm that had been sounded in previous months.
From historic low to full recovery
The picture of Morno Dam has changed radically in a matter of months, leaving behind the alarming drought of 2025. Whereas last October, reserves had fallen to 156.9 million cubic metres – the worst performance in 15 years – the situation today is completely different. The latest measurement, dated April 8, 2026, shows that the volume of water has shot up to 491.6 million cubic metres, providing a significant “safety breather” for the Basin.
The return of Kallie to the bottom
This change is visible at first glance in the lake’s landscape. The village of Callio, which had emerged due to the receding waters, was once again covered by water. The surface of the lake, which in October 2025 had shrunk to just 8.3 square kilometres (a 44% reduction from the average), now extends to 14.7 square kilometres. The ruins of the settlement have almost disappeared below the surface, marking a return to normality.
The life-saving rainfall of 2026
This spectacular turnaround is due to the extremely wet winter and first quarter of 2026. After a 2025 that was described as the driest year in a decade, the unprecedented rainfall of the last few months acted as a catalyst. The amount of water the region received was the largest in the last ten years, allowing the reservoir to approach again the levels of 2018, when a record 605 million cubic metres was recorded.
The impressive replenishment of supplies finally removes fears of water shortages in the capital, which had evoked memories of the difficult days of the early 1990s. With Kallio once again sheltered at the bottom of the lake, the period of hydrological uncertainty is coming to an end, leaving behind a landscape once again teeming with life and water.
