Where does your water come from? The Canaries and their thirst

The Canaries pull off a quiet little miracle: green resorts and full showers — on islands with almost no rivers and only limited groundwater. So where does the water come from? Largely from the sea.

Because the islands are world champions at desalination. Where nature delivers too little, seawater is made drinkable. It sounds technical, but in daily life it is long since routine — and it explains why water matters more here than in most places.

How the islands get their water

The backbone is seawater desalination. About 80% of the plants use reverse osmosis, forcing salt water through fine membranes. Lanzarote led the way: in 1964, Arrecife got Spain's first industrial desalination plant.

Today the dry eastern islands — Lanzarote and Fuerteventura — and Gran Canaria depend almost entirely on desalinated water. On Tenerife and La Palma, old groundwater from galerías (water tunnels) and wells also plays a part. The catch: desalination needs a lot of electricity, which is why the islands increasingly turn to wind and sun.

The drought — and its end

After one of the driest winters in memory, Tenerife declared a water emergency in May 2024. It lasted almost two years. A very wet winter of 2025–2026 turned things around: in late February 2026 the emergency was lifted, with reserves at around 70% — the highest level in six years.

Why it matters to you too

As a guest or adopted islander, you are part of the equation. Nobody expects you to go without — but a few habits genuinely help: showering a little shorter, reusing towels, not letting the tap run. On islands that draw every litre from the sea, that is more than a nice gesture.

Looking ahead

The Canaries keep expanding: new containerised desalination plants are meant to supply farming too, driven by more renewable energy. Not everyone is thrilled — some experts question whether new plants are needed everywhere. What is clear: the mix of saving, desalinating and clean power will decide how calmly the islands ride out the next dry winter.