If you've ever wondered why everything grown on Santorini tastes slightly different, or why the tap water tastes the way it does, the island's water supply is a good part of the answer — it's an unusually stark case of a place that genuinely doesn't have enough natural water to exist at its current scale without engineering to compensate.
No natural freshwater
Santorini has no rivers, no lakes, and almost no natural springs — the volcanic soil is too porous to hold rainwater, and the island gets far less rainfall than most of Greece. Historically, residents relied entirely on cisterns to collect the scarce winter rainfall, and water was rationed far more tightly than anywhere on the Greek mainland.
The desalination plant
Today, most of the island's water comes from a seawater desalination plant — one of the larger ones in the Cyclades, necessary to supply the island's swollen summer population (which can exceed several hundred thousand visitors simultaneously, vastly outnumbering the roughly 15,000 permanent residents). The plant converts seawater to drinking water, which is why Santorini's tap water often has a slightly different taste from mainland Greece, and why water conservation is taken seriously here in a way that can surprise visitors from places with more abundant supply.
Why this matters to travellers
Don't leave hotel taps running unnecessarily — conservation is genuinely meaningful here in a way it isn't everywhere. Bottled water is widely available but expensive relative to most European destinations partly because of the underlying scarcity. And it's part of why the island's food tastes the way it does: crops like tomatoes, capers and grapes growing with almost no irrigation concentrate their flavours in a way that would be impossible on a well-watered island.
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