Water reserves at Greece’s Mornos reservoir have tripled over the past six months, ending an alarm over the capital’s water supply that had been raised last autumn.Water reserves at Greece’s Mornos reservoir have tripled over the past six months, ending an alarm over the capital’s water supply that had been raised last autumn. The reservoir held 156,996,000 cubic meters on October 23, 2025 – its lowest level in 15 years – before climbing to 491,629,000 cubic meters by April 8, 2026, according to data processed by Orange Press Agency from Athens water utility EYDAP figures. The lake’s surface area similarly rebounded, from 8.3 square kilometers last October – 44% below its decade-long average – to 14.7 square kilometers by April 7, submerging the ruins of Kallio, a ghost village that had eerily re-emerged as water levels fell. Kostas Lagouvardos, research director at the National Observatory of Athens (NOA), credited record rainfall. “The first quarter of the year saw an impressive amount of precipitation in the area – the highest for those three months in the past decade,” he said. He cautioned against complacency, however. “We are in a much better situation than we were in the fall, but we are still slightly below normal,” Lagouvardos said, warning that rising temperatures, stronger evaporation and summer consumption would test the reservoir in the coming months. “We all hope for a good hydrological year,” he said. Rainfall at both NOA monitoring stations in the Mornos catchment area reached decade highs for January-March.
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