Greece’s water problem is no longer just an environmental concern. It is becoming an economic risk with real consequences for taxpayers, businesses, tourism, agriculture, infrastructure spending, and the country’s long-term competitiveness.
That risk is particularly serious because Greece depends heavily on sectors that cannot function without reliable water. According to 2025 SETE-INSETE economic assessments, tourism contributed roughly €30 billion directly to the Greek economy in 2024, or about 13% of GDP. When the wider impact is included — hotels, restaurants, transport, retail, construction, food supply chains, and local services — tourism reaches close to one-third of the national economy. This creates an uncomfortable contradiction: Greece’s economic engine runs hardest during the hottest and driest months of the year.
The Greek island of Astypalaia declared a state of emegency over water scarcity in March.
Islands such as Santorini, Mykonos, Rhodes, Paros, and parts of Crete see their populations multiply during summer while their water systems are already under pressure. Santorini alone receives millions of visitors every year despite having a permanent population of roughly 15,000 people. The economics of the current model are becoming increasingly difficult to defend. On many Greek islands, the real cost of producing and supplying water is estimated between €3.5 and €9 per cubic meter, while emergency tanker supply can push costs significantly higher. Yet consumers often pay only a fraction of that cost because water tariffs remain heavily subsidized and politically sensitive.
At the same time, Greece continues to lose enormous volumes of treated water through old and inefficient infrastructure. Reuters reported in 2025 that parts of the national network lose around half of drinking water through leakage, theft, and system inefficiencies — almost twice the EU average. In some regions, the reported losses are even higher, reflecting decades of underinvestment and fragmented municipal management. This means taxpayers are already paying for water that never reaches anyone. They are paying for treatment, pumping, transport, chemicals, energy, emergency logistics, and maintenance across a system that leaks value before it reaches the consumer.
The crisis is no longer limited to the islands. Attica, long seen as relatively protected compared with the Aegean islands, is now facing its own warning signs. Declining reservoir levels supplying Athens have already triggered renewed discussions around desalination, water reuse, and large-scale transfer infrastructure. Whether the worst-case projections materialize or not, the direction is clear: Greece’s political and economic center can no longer assume water security as a given.
The Mornos Lake, Attica’s main reservoir reached a 15-year low in 2025, cause the submerged village of Kallio to resurface.
Agriculture faces the same pressure from another direction. According to OECD and FAO data, roughly 80% of Greece’s water abstraction is linked to agriculture, much of it through inefficient irrigation and stressed aquifers. Thessaly, one of the country’s most important agricultural regions, already faces chronic water deficits that threaten productivity, rural incomes, and long-term regional stability. The wider economic consequences are easy to underestimate because they do not arrive all at once. First come tanker costs, emergency repairs, bottled water dependence, and rising utility bills. Then come pressure on hotels, agriculture, food production, insurance, real estate values, development permits, industrial investment, and confidence in water-stressed regions. Water scarcity gradually moves from the reservoir into the balance sheet.
Even a modest disruption can become expensive at national scale. A small reduction in tourism activity caused by worsening water insecurity could translate into billions of euros in annual losses once the wider economy is included. For a country where tourism is such a large part of GDP, unreliable water supply is not just an operational problem. It is a national business risk.
This is why desalination is no longer just a technical discussion. It is becoming strategic economic infrastructure. For years, desalination in Greece was treated mainly as an expensive last resort for isolated islands. That view is outdated. Countries such as Israel, Spain, Cyprus, and Malta increasingly treat desalination as permanent climate-resilient infrastructure because it offers something Southern Europe increasingly lacks: predictability.
Water shortage in the Evros Delta, July 20, 2025.
Reservoirs depend on rainfall. Aquifers depend on recharge. Rivers depend on stable hydrology. Desalination depends on energy, engineering, and competent system design. In a climate where rainfall patterns are becoming less reliable, that difference matters. Desalination is not the whole answer. Greece also needs aggressive leakage reduction, modern irrigation, wastewater reuse, better pricing, stronger governance, and long-term infrastructure planning. But without serious investment in resilient water systems, the country risks entering a cycle where water scarcity starts limiting economic growth itself.
The numbers are now difficult to ignore. Greece is already spending vast sums managing inefficiency, emergency logistics, infrastructure failures, and scarcity-related pressure. The question is no longer whether resilient water infrastructure is expensive. It is how expensive continued delay will become.
Note: Some financial estimates and scenario-based calculations in this article are derived from synthesis of publicly available government, OECD, Reuters, Eurostat, tourism-sector, and engineering assessment data. Certain ranges represent indicative economic estimates rather than official audited values, particularly regarding subsidy burdens, island water production costs, and modelled tourism-loss scenarios.
*Christos Charisiadis is a Greek water and sustainability consultant based in the Netherlands, with international experience across Europe and the Middle East. He is the founder of a boutique consultancy focused on water scarcity, desalination, water reuse, and circular economy strategies. Over the past years, he has worked on large-scale international water projects and regularly contributes commentary and analysis on the future of water systems, climate resilience, and sustainable infrastructure.’
