The withdrawable reserves of the main reservoirs supplying Athens rose from 399.7 million m3 on January 1, 2026 to 723.9 million m3 on July 1, 2026, according to EYDAP's semi-annual report. EYDAP attributes the rise mainly to rainfall and says reserves are "still significantly below the historically high levels of 2019".
A surface-water system under strain
In 2021 EYDAP sourced 439.2 million m3 of water, all of it surface water. Attica was declared in a state of emergency for water shortage on November 28, 2025, for six months. Working with the State, EYDAP put the Yliki pumping stations and wells at Mavrosouvala and Ungra into operation, reduced the environmental release from the Evinos reservoir and restored 11 boreholes in the Paralimni area. EYDAP says these actions "have added approximately 56 million cubic meters" to the supply system.
The long-term project is still at design
Eurytos, the partial diversion of the Krikeliotis and Karpenisiotis rivers to the Evinos reservoir, was put at about €750 million in April 2026, up from about €535 million in February 2026, according to press reports. Its tender was expected in the fourth quarter of 2026. Implementation is placed "towards 2029 or later".
Demand edged down
Invoiced consumption fell 0.6% in 2025 to 303.164 million m3. Water recycled and reused reached 18,178,007.50 m3 in 2025, against 17,103,240.50 m3 in 2024.
Who owns and decides each part of Athens' water system, how EYDAP's 14,300 km network and four treatment plants perform, and what its €2.5 billion plan for 2026–2035 funds are set out in the report. The full report, Water Systems Overview: EYDAP S.A., is available for USD 499. For a free overview, read the EYDAP S.A. Utility Snapshot.