Water Scarcity and Planning in England

 

Water scarcity is becoming an increasingly important planning issue, particularly in parts of eastern and south-east England where existing demand, population growth, climate change and environmental limits all place pressure on available supplies.

It is not the same thing as water neutrality. A site can be in a water-stressed area without being subject to a bespoke neutrality requirement. In most cases the planning response is about water efficiency, infrastructure, phasing and demonstrating that development can be supplied without unacceptable environmental consequences.

This page explains how water scarcity can affect development, what serious water stress means, how the planning system interacts with water company resource planning, and what applicants should check before relying on an assumed water supply.

 

What does water scarcity mean?

 

Water scarcity describes a situation where reliable demand for water is difficult to meet without putting unacceptable pressure on available resources or the environment. In England this can arise because of limited rainfall, high abstraction, population growth, leakage, drought risk, climate change or the ecological limits of rivers, wetlands and aquifers.

The Environment Agency periodically classifies water company areas according to water stress. The current formal classification dates from 2021 and identifies a number of company areas as being in serious water stress. The statutory purpose of that determination is to inform whether water companies may consider charging all customers by metered volume as part of demand management; it is not itself a planning designation. It can nevertheless provide useful background evidence that water resources and demand management require particular attention in those areas.

 

Where is water scarcity most significant?

 

The greatest pressure is generally in the East and South East of England, although water-resource constraints can occur elsewhere. Much of the region has relatively low rainfall, high population density and strong development pressure, while important rivers and groundwater-dependent habitats can limit how much additional abstraction is environmentally sustainable.

Chalk streams are a particularly sensitive example. Many depend heavily on groundwater flows, so excessive abstraction can affect river levels, water quality and habitat. This is one reason why simply finding a physical source of water is not the same as demonstrating that additional abstraction is environmentally acceptable.

 

Does serious water stress stop development?

 

No. A serious water-stress designation is not an automatic moratorium on development. It does not mean that every planning application within the affected company area must prove water neutrality.

Instead, the planning authority will consider the development plan, national policy, infrastructure evidence and any site-specific environmental effects. Water companies are responsible for preparing Water Resources Management Plans, while regional groups coordinate strategic water-resources planning. These plans look ahead at future demand, supply, drought resilience and environmental requirements.

For a normal housing proposal, the key question is often whether the development can be supplied within the planned water-resource position and whether any necessary infrastructure can be delivered in time.

 

Water scarcity and the 2026 NPPF

 

The National Planning Policy Framework expects planning to take account of climate change, natural resources and infrastructure. Water supply is therefore relevant both to plan-making and to individual proposals where the issue is material.

Local plans can also respond to clear evidence of water stress through policies on water efficiency and infrastructure. The Tonbridge and Malling Local Plan story is a live example of the tension between a major housing requirement and water-supply headroom. Applicants should check the adopted development plan rather than assuming the Building Regulations minimum is the only standard that matters.

 

What water-efficiency standard applies to new homes?

 

At present, Building Regulations Part G requires new dwellings to meet the mandatory national water-efficiency standard of 125 litres per person per day. Where a local planning authority has an appropriately evidenced Local Plan policy, planning permission can require the tighter optional standard of 110 litres per person per day.

The Government consulted in 2025 on tightening those standards, but as at August 2026 the existing 125 and 110 litre standards remain the statutory position.

Water efficiency can also involve low-flow fittings, efficient appliances, rainwater harvesting, greywater recycling and landscape design that reduces potable-water demand. For landowners considering water storage, our guide to pond planning permission explains the very different rules for residential curtilage, agricultural units above and below 5 hectares and equestrian land. The appropriate measures depend on the scale of development and the local policy context.

 

What should developers check?

 

Water should be considered early in site appraisal rather than after a scheme has been designed. Useful checks include:

• which water company supplies the site
• whether the area is formally classified as being in serious water stress
• the relevant Water Resources Management Plan and regional water-resource strategy
• whether the Local Plan requires the optional 110 litres per person per day standard
• whether reinforcement or new supply infrastructure is required
• whether the proposal could affect a protected river, wetland or groundwater-dependent habitat
• whether the authority or water company has identified phasing or infrastructure constraints
• whether rainwater harvesting, greywater reuse or other measures are justified for the scheme

 

Water scarcity is not water neutrality

 

This distinction matters. Water scarcity is the broader issue of whether enough environmentally sustainable water is available for homes, businesses, agriculture and other users. Water neutrality is a more specific approach under which a development is expected to avoid increasing overall water demand, usually because of a particular environmental constraint.

The Sussex North water-neutrality regime was a good example of the second category. Natural England withdrew that specific position in October 2025. Our Water Neutrality guide explains the history and current position.

 

Can a lack of water infrastructure affect planning permission?

 

Yes. Where there is credible evidence that a development cannot be supplied or that necessary infrastructure will not be available when required, that can affect planning judgment, conditions, phasing or the timing of development.

But the position is fact-sensitive. Planning should not simply duplicate the water industry regulatory system, and a general statement that an area is water stressed does not by itself prove that a particular proposal is unacceptable. The authority needs evidence relevant to the proposal and the infrastructure position.

 

Water scarcity and protected habitats

 

Where additional abstraction or changes to hydrology could affect a European site or Ramsar site, the issue may also engage the Habitats Regulations Assessment process. Similar concerns can arise for Sites of Special Scientific Interest and other sensitive habitats.

This is where a broad water-resource issue can become a site-specific ecological constraint. The appropriate response depends on the protected feature, the hydrological pathway and the certainty of the evidence.

 

Useful official sources

 

• Environment Agency – Water stressed areas: 2021 classification
• National Framework for Water Resources 2025
• Water resources planning guideline
• Planning Practice Guidance – housing optional technical standards

Conservation, Heritage & Protected Sites

 

Water Scarcity Page Created: 27th August 2026