Water Resource Zones Serving 70% of Wales Could Face Deficits by 2050

Wales is not short of rainfall. It can still be short of water, because supply depends on where and when rain falls, how much is lost in transit, and how much is being drawn at the moment of peak demand.

The 60-word answer

Natural Resources Wales projects that water resource zones covering around 70% of the Welsh population could be in deficit by 2050 unless leakage control and water efficiency measures are implemented. That is a conditional projection about supply-demand balance in defined zones, not a prediction that Wales will run out of water.

What the evidence says

• Projected: zones serving approximately 70% of the Welsh population could face deficit by 2050 (NRW).
• Conditional: the projection explicitly assumes leakage control and efficiency measures are not delivered.
• Observed context: Welsh seasons are already shifting; spring 2025 delivered only 52% of normal rainfall (Met Office).

What a “water resource zone” actually is

A water resource zone is the planning unit water companies use: an area within which supply can be moved around and customers face broadly the same risk. A zone in deficit means projected demand exceeds the reliable yield of its sources under a defined drought standard. It is an accounting balance, not an empty reservoir.

What it does not mean

It does not mean 70% of Welsh households will lose supply in 2050. It does not mean rainfall is expected to collapse. And the deficit is not fixed: the projection exists to justify the very interventions that would prevent it.

Why this matters in Wales

Pressure comes from three directions at once: hotter, drier summers reducing yield exactly when demand peaks; population and housing growth; and abstraction limits tightening to protect river ecology, a genuine trade-off, since only 40% of Welsh water bodies currently achieve good status. Leakage is the fourth factor, and the most directly fixable.

What can be done

See our companion piece on practical water efficiency actions for organisations. In summary: measure consumption before setting targets, fix leaks on your own side of the meter, and treat water alongside energy in environmental reporting rather than as an afterthought.

Sources and methodology

• State of Natural Resources Report (SoNaRR) 2025, Natural Resources Wales.

We have kept NRW’s conditional framing throughout. The 70% figure refers to population served by affected zones, not to a volume of water or a share of land area.

Last reviewed: 31 August 2026.

Context: Climate change in Wales. Related: flood risk in Wales.