--- title: 'Nutrient Neutrality Explained: Catchments, Budgets and the Nature Restoration Fund' description: 'Why nutrient neutrality blocks planning permission in 27 river catchments, how a nutrient budget is calculated, what mitigation counts, and what Environmental Delivery Plans change.' metaTitle: 'Nutrient Neutrality Explained' category: Compliance date: 2026-10-26 readingTime: 9 min read lead: In 74 local planning authorities, a scheme that adds wastewater to an already overloaded catchment cannot be permitted until the extra nitrogen and phosphorus are cancelled out. The regime that replaces it is being built right now, and the first draft plan went out for consultation in September 2026. cardDescription: Which catchments are affected and why, the Habitats Regulations basis for the requirement, how a nutrient budget is built, which mitigation options are accepted, and how Environmental Delivery Plans and the Nature Restoration Levy will change the position. ctaHeading: Keep the water data your mitigation case rests on ctaBody: VerdCore's Water Tracker logs consumption, recycling, harvesting and discharge across five streams, giving you measured figures rather than design assumptions when a nutrient or water case has to be evidenced. footerNote: This guide is general information, not planning, legal or hydrological advice. Nutrient neutrality is catchment-specific and the Environmental Delivery Plan regime is being introduced in stages — check current Natural England advice and your local planning authority's position for the catchment and date in question. ogTitle: Nutrient Neutrality Explained for Developers ogDescription: 'Why nutrient neutrality blocks permission in 27 river catchments, how a nutrient budget works, and what Environmental Delivery Plans change.' faq: - q: What is nutrient neutrality? a: A planning requirement that a new development must not add any net nitrogen or phosphorus load to a protected habitat site already in unfavourable condition because of nutrient pollution. Any additional nutrient load from the development has to be offset so the net effect is zero or better. - q: Where does nutrient neutrality apply in England? a: Natural England's nutrient advice covers 74 local planning authorities, for 31 protected sites across 27 river catchments assessed as being in unfavourable condition due to nutrient pollution. Well-known affected areas include the Solent, the Somerset Levels and Moors, Stodmarsh, Poole Harbour, the River Avon, the River Lugg and the Broads. - q: Why does nutrient neutrality stop planning permission being granted? a: Because the Habitats Regulations require an appropriate assessment where a development could have a significant effect on a protected site, and permission cannot be granted unless the authority can conclude there is no adverse effect on site integrity. Additional nutrient loading to an already failing site prevents that conclusion unless it is fully mitigated. - q: How is a nutrient budget calculated? a: By estimating the additional nitrogen and phosphorus load the development will generate, mainly through wastewater from new occupants, netting off the nutrient load from the existing land use, and applying the assumptions in Natural England's catchment calculator including a precautionary buffer. - q: What mitigation is accepted for nutrient neutrality? a: Options include on-site or upgraded wastewater treatment, land use change such as taking arable land out of production, constructed wetlands, and buying nutrient credits from a mitigation scheme. Mitigation must be secured for the lifetime of the development and be additional to what would have happened anyway. - q: What is the Nature Restoration Fund? a: A new mechanism under Part 3 of the Planning and Infrastructure Act 2025 under which Natural England prepares an Environmental Delivery Plan for an area and developers discharge their obligation by paying a Nature Restoration Levy into a central fund, instead of arranging their own project-by-project mitigation. - q: Has nutrient neutrality been abolished? a: No. The Planning and Infrastructure Act 2025 received Royal Assent on 18 December 2025, but the Environmental Delivery Plan regime is being introduced catchment by catchment. Until an Environmental Delivery Plan covers a given catchment, the existing nutrient neutrality requirements continue to apply in full. - q: When will Environmental Delivery Plans be in place? a: Natural England notified the government in December 2025 that it intended to prepare 23 Environmental Delivery Plans, 16 of them for nutrient pollution. The first draft plan, covering the Norfolk Broads and the River Wensum, went out for consultation on 17 September 2026. --- ## What nutrient neutrality actually requires **Nutrient neutrality** requires that a development adds no net nitrogen or phosphorus load to a protected habitat site that is already in unfavourable condition because of nutrient pollution. Whatever extra load the scheme generates — overwhelmingly through wastewater from the people who will live or work in it — has to be cancelled out, so the net effect on the catchment is zero or better. It is a harder constraint than most environmental planning requirements, for a structural reason. It is not a policy target that can be weighed against housing need in a planning balance. It is a consequence of the **Habitats Regulations**, which require an appropriate assessment where a development could have a significant effect on a protected site, and which prevent permission being granted unless the authority can positively conclude there will be no adverse effect on the integrity of that site. Where the site is already failing because of nutrients, an authority cannot reach that conclusion about a scheme that adds more of them. The application does not get refused on balance — it stalls, sometimes for years, until the nutrients are dealt with. That is why nutrient neutrality has held up tens of thousands of homes in affected catchments since Natural England began issuing its advice, and why it generates far more heat than its relatively narrow geographic footprint would suggest. ## Where it applies Natural England's nutrient advice, issued in **2019 and extended in 2022**, covers **74 local planning authorities**, for **31 protected sites** spanning **27 river catchments** assessed as being in unfavourable condition because of nutrient pollution. The best-known affected areas include: - **The Solent** — the original and most heavily affected catchment, covering much of south Hampshire - **The Somerset Levels and Moors** - **Stodmarsh** in Kent - **Poole Harbour** in Dorset - **The River Avon** - **The River Lugg** in Herefordshire - **The Broads** in Norfolk and Suffolk The affected list is specific and published, and the only reliable way to establish whether a site is caught is to check the current Natural England advice for the catchment and confirm the position with the local planning authority. Catchment boundaries do not follow administrative ones, so neighbouring sites in the same district can fall on opposite sides of the line. > **Being outside a nutrient catchment is not the same as being unconstrained.** Several of the same authorities also operate [water neutrality](/resources/water-neutrality-in-planning.html) requirements, which address water _quantity_ rather than nutrient _load_. They are separate tests with separate calculations, and a site can be subject to both. ## How a nutrient budget works A nutrient budget is an arithmetic exercise with a precautionary thumb on the scale. The components: 1. **Additional load from the development.** Driven by the number of new occupants, their estimated wastewater generation, and the nitrogen and phosphorus concentrations in the discharge from the treatment works that will serve the site. A scheme served by a works with poor nutrient removal starts from a worse position than an identical scheme served by a modern one. 2. **Existing load from the current land use.** Netted off. This is why arable land — which already leaches substantial nitrogen through fertiliser application — can produce a lower net budget than a greenfield pasture site, and why previously developed land in the catchment is attractive. 3. **The calculator's assumptions.** Natural England publishes catchment-specific calculators that set occupancy rates, an assumed development lifetime and a precautionary buffer. Those assumptions are not negotiable inputs; using your own occupancy figures is a reliable way to have a budget rejected. The output is a required mitigation quantity, usually expressed in kilogrammes of nitrogen or phosphorus per year, which has to be delivered for the lifetime of the development. ## What counts as mitigation Four broad routes, in rough order of how often they are used: - **Buying nutrient credits.** Mitigation schemes — run by local authorities, Natural England, water companies and private operators — create nutrient reductions and sell them as credits. This is the dominant route for small and medium schemes, because arranging your own mitigation is disproportionate below a certain size. Natural England runs its own **Nutrient Mitigation Scheme**, and [clarified its role in that scheme in May 2026](https://naturalengland.blog.gov.uk/2026/05/14/nutrient-mitigation-scheme-clarification-of-natural-englands-role/). - **Land use change.** Taking arable land out of production, reverting it to permanent grassland or woodland, and securing it long-term. The nutrient saving is the difference between the fertilised and unfertilised states. - **Constructed wetlands and interception.** Engineered treatment that removes nutrients from water before it reaches the protected site. - **On-site or upgraded wastewater treatment.** Package treatment plants achieving very low nutrient concentrations, or contributions to upgrading the receiving works. Whichever route, mitigation has to be **additional** — it cannot be something that was going to happen anyway, such as a legislated upgrade to a wastewater treatment works already required in the catchment — and it has to be **secured** for the development's lifetime, normally through a section 106 agreement or conservation covenant. An intention to mitigate is not mitigation. ## What is changing: Environmental Delivery Plans The project-by-project model has always been inefficient. Every developer in a catchment separately commissions ecological advice, separately sources mitigation and separately negotiates a legal agreement, to address a problem that is identical across the whole catchment. **Part 3 of the Planning and Infrastructure Act 2025**, which received Royal Assent on **18 December 2025**, replaces that with a strategic mechanism: - Natural England prepares an **Environmental Delivery Plan (EDP)** for an area, identifying the conservation measures needed to address a specific environmental impact across the whole of it. - Developers discharge their obligation by paying a **Nature Restoration Levy** into the **Nature Restoration Fund**, rather than arranging their own mitigation. - The EDP regime covers a defined list of impacts: **nutrient neutrality, water quality, water resources and air quality**. It is not a general-purpose replacement for environmental assessment. The timetable is live but incomplete. Natural England notified the government in **December 2025** that it intended to prepare **23 EDPs, 16 of them for nutrient pollution**. The **first draft EDP went out for consultation on 17 September 2026**, covering the **Norfolk Broads and the River Wensum**, and it has not been uncontroversial — the ecological community's central objection is that paying into a fund severs the link between a specific impact and a specific, demonstrated remedy.
Two regimes, running in parallel
1
No EDP in place yet
The existing regime applies in full: your own nutrient budget, your own mitigation, secured by agreement.
2
Draft EDP consulting
Norfolk Broads and River Wensum from 17 September 2026. The existing regime still governs decisions.
3
EDP made
Pay the Nature Restoration Levy instead of arranging project-level mitigation for the covered impact.
## What this means for a site today The single most important point, and the one most often got wrong in commentary: **nutrient neutrality has not been abolished, suspended or softened.** Until an EDP is actually in place for a given catchment and covers the relevant impact, the existing requirements apply in full, unchanged. So for a scheme being brought forward now: - **Assume the existing regime.** Budget for a nutrient assessment and mitigation, on the current rules, in the current way. - **Do not programme around a future EDP.** One draft plan is consulting out of 16 intended for nutrients. A consultation opening is a long way from an EDP being made and operative. - **Start mitigation sourcing early.** Credit availability in the tighter catchments is the binding constraint, not the calculation. Schemes stall waiting for credits, not waiting for arithmetic. - **Watch the catchment, not the Act.** The question that determines your position is whether an EDP covers _your_ catchment and _your_ impact, not what stage the national programme has reached. ## Common mistakes - **Reading Royal Assent as deregulation.** The Act created a mechanism; the mechanism is being built catchment by catchment. Nothing changed for most sites on 18 December 2025. - **Using your own occupancy assumptions.** The catchment calculator's assumptions are the ones that count, and substituting more favourable figures invites rejection. - **Claiming credit for mitigation that was happening anyway.** Additionality is tested. Legislated treatment works upgrades in the catchment are generally not available to you as mitigation. - **Leaving credit purchase to the end.** Availability, not price, is usually what delays schemes in the constrained catchments. - **Assuming nutrient neutrality and water neutrality are the same test.** One is about nutrient load, the other about water quantity. Both can apply to one site, and each needs its own case. - **Treating the budget as a one-off design-stage number.** Occupancy and discharge assumptions need to still be true at completion, and some authorities now look for confirmation that they are. ## How this connects to your wider environmental reporting Nutrient neutrality, [water neutrality](/resources/water-neutrality-in-planning.html) and [Biodiversity Net Gain](/resources/biodiversity-net-gain-explained.html) are three separate regimes that share one structure: establish a baseline, calculate what the development adds, close the gap through a defined hierarchy, and keep it secured for decades. They are also increasingly landing on the same desk, assessed by the same authority, against the same site. What they have in common practically is that each case is only as strong as the measured data behind it — discharge volumes, consumption figures and the monitoring that shows design assumptions survived contact with the completed building. That is the same evidence that supports your [trade effluent consents](/resources/trade-effluent-discharge-consents.html) and [BREEAM water credits](/resources/breeam-water-credits-explained.html), and it is what VerdCore's [construction water tracking software](/construction-water-tracking-software.html) is built to capture continuously rather than reconstruct.