Nutrient Neutrality and Planning in England

 

Nutrient neutrality is a planning and habitats issue affecting development in a number of sensitive river, lake, estuary and wetland catchments in England. It arises where excess nitrogen or phosphorus is already harming a protected site and new development could add further nutrient pollution, commonly through wastewater.

The practical consequence can be significant. A development may need a nutrient budget and secured mitigation before the competent authority can conclude through Habitats Regulations Assessment that the proposal will not adversely affect the integrity of the protected site.

The system is changing in 2026. Existing nutrient-neutrality calculations and mitigation schemes continue to operate, while Natural England is preparing Environmental Delivery Plans under the Planning and Infrastructure Act 2025 for a number of nutrient-affected catchments.

 

What is nutrient neutrality?

 

Nutrient neutrality means that a development does not cause an overall increase in nutrient pollution affecting a protected site. The issue normally concerns nitrogen, phosphorus or both.

These nutrients occur naturally, but excessive concentrations can trigger algal growth and other ecological changes. In sensitive rivers, lakes, wetlands and estuaries that can alter plant communities, reduce oxygen and damage the habitats and species for which a site is protected.

New housing and visitor accommodation are often caught because additional occupation creates additional wastewater. Agricultural land use can also be relevant because changing the use of land can alter nutrient losses to the catchment.

 

Where does nutrient neutrality apply?

 

It does not apply everywhere in England. Natural England currently provides nutrient-neutrality calculators for 27 catchments where specified protected sites are affected by nutrient pollution.

These include well-known areas such as the Solent, Somerset Levels and Moors, Stodmarsh, Poole Harbour, the River Avon, the River Lugg, the Broads and a number of other catchments. The exact nutrient, protected site and geographical catchment vary, so applicants should check the current Natural England mapping and calculator rather than relying on an old list of local planning authorities.

 

Why can nutrient neutrality prevent planning permission?

 

Where a proposal is likely to have a significant effect on a European site or Ramsar site, regulation 63 of the Conservation of Habitats and Species Regulations 2017 requires an appropriate assessment before consent can normally be given.

The competent authority must be able to ascertain that the proposal will not adversely affect the integrity of the protected site. Where the site is already failing because of excessive nutrients, even a relatively small additional load can make that conclusion difficult unless the development is shown to be nutrient neutral or another lawful route applies.

 

How is a nutrient budget calculated?

 

Natural England publishes nutrient-neutrality calculators for affected catchments. For residential development, the calculation commonly considers expected occupancy, wastewater treatment, the nutrient concentration of the discharge, existing and proposed land uses, surface-water drainage and a precautionary buffer.

The result identifies the additional nitrogen or phosphorus load that needs to be avoided or mitigated. The assumptions need to match the actual development and the current catchment guidance.

 

How can nutrient mitigation be provided?

 

Depending on the catchment, mitigation can include:

• converting intensively farmed land to a lower nutrient land use
• creating or restoring wetlands
• woodland creation
• upgrading or redirecting wastewater treatment
• buying nutrient credits from an approved mitigation provider
• buying credits through Natural England where its Nutrient Mitigation Scheme operates
• a bespoke mitigation package secured for the individual development

Mitigation must be capable of being relied upon for Habitats Regulations purposes. In practice that normally means it needs to be effective, additional, sufficiently certain and secured for the necessary period.

 

Can a developer simply buy nutrient credits?

 

Sometimes, but not in every catchment. Credit availability varies considerably. Natural England currently sells credits in the Tees and Poole Harbour catchments, while local authority and private schemes operate in other areas.

A development can therefore be capable in principle of achieving nutrient neutrality but still face a practical delay if suitable mitigation capacity is unavailable. This is why mitigation should be checked during acquisition and early design rather than after an application has been submitted.

 

What is changing through Environmental Delivery Plans?

 

The Planning and Infrastructure Act 2025 created a new system of Environmental Delivery Plans (EDPs). An EDP can identify development impacts, conservation measures and a nature restoration levy which developers pay towards strategic environmental action.

In December 2025 Natural England notified the Government that it intended to prepare 23 EDPs, including 16 for nutrient pollution from development affecting protected sites.

During 2026 these EDPs are being developed. Until a relevant EDP is actually made and applies to a development, the existing nutrient-neutrality and Habitats Regulations arrangements remain important. The transition is therefore not a blanket abolition of nutrient neutrality.

 

How will the nature restoration levy work for nutrient impacts?

 

Government guidance published on 1 September 2026 explains the application-stage mechanics. Once a relevant EDP is in force, a developer can obtain a levy quote for eligible development. The important catch is that a quote does not reserve capacity. Before submitting the planning application, the developer can ask Natural England to use the levy route. If the request is accepted, Natural England issues a commitment certificate and allocates EDP capacity to the development.

The commitment certificate should be submitted with the planning application. If it is not used for an application within six months, the commitment expires and the capacity is released. For a nutrient impact which is actually covered by the EDP and a valid commitment, the planning authority does not need to deal with that covered impact through the normal project-specific environmental process, such as an appropriate assessment for that impact.

That does not mean every habitats issue disappears. Other effects on the protected site which fall outside the EDP remain subject to the normal HRA process, and Biodiversity Net Gain remains separate. After planning permission, liability normally has to be assumed and the levy, or the first instalment, must be paid before development starts under the statutory pre-commencement condition.

See the Government’s guidance on using the nature restoration levy and our Nature Restoration Fund guidance update.

 

What happens to existing mitigation schemes?

 

The Government has said that Natural England’s Nutrient Mitigation Scheme will transition to the relevant EDP where one becomes available. Existing third-party mitigation schemes can continue to sell credits directly to developers, and bespoke mitigation may also continue under the existing regulatory system.

Local authority schemes may continue, change or transition depending on the circumstances in each catchment. For a live project, the practical question is therefore not only whether the site is in a nutrient-neutrality catchment, but which mitigation route is actually available for that development now.

 

Nutrient neutrality and wastewater treatment works

 

Wastewater is often the main development-related pathway. The nutrient budget therefore depends heavily on where wastewater will be treated and the assumptions applicable to the receiving sewage treatment works.

Applicants should not assume that a future upgrade, permit change or infrastructure project can automatically be relied upon. If the planning authority needs certainty for an appropriate assessment, the relevant measure must be sufficiently certain in substance and timing.

 

Practical checks before buying or applying

 

• Check whether the site lies in one of the current nutrient-neutrality catchments
• Identify whether nitrogen, phosphorus or both are relevant
• Use the current Natural England calculator and catchment guidance
• Confirm the wastewater treatment works serving the development
• Check whether nutrient credits or other mitigation are actually available
• Establish how mitigation will be legally secured
• Check whether an Environmental Delivery Plan is being prepared or has been made for the catchment
• If a made EDP applies, remember that a quote alone does not reserve capacity: obtain the commitment before relying on the levy route in an application
• Remember that nutrient mitigation deals with one impact pathway only; other HRA effects may still need assessment

 

Useful official sources

 

• Natural England – nutrient neutrality calculators
• Natural England Nutrient Mitigation Scheme
• Natural England – proposed Environmental Delivery Plans
• Government – Environmental Delivery Plans collection
• Government – understanding the Nature Restoration Fund
• Government – using the nature restoration levy
• Government – implementing the Nature Restoration Fund

Conservation, Heritage & Protected Sites

 

Nutrient Neutrality Page Created: 27th August 2026 | Updated: 3rd September 2026