NutrientMonkey
Nutrient Neutrality Calculator
Only the areas of land whose use is being altered by the development. Export coefficients are indicative defaults — replace with the official catchment value for your soil / rainfall / NVZ.
The land cover present on the same area once built (e.g. residential urban land, open urban land, greenspace).
Free to use on screen. See an example report
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Nutrient neutrality means a new residential development will not cause a net increase in nutrient pollution to a protected habitats site. Natural England catchments are assessed for nitrogen, phosphorus, or both — e.g. Poole Harbour and the Solent (incl. Chichester Harbour) are nitrogen; the River Avon (which discharges into Christchurch Harbour) is phosphorus; Stodmarsh and The Broads are both. Where a catchment requires both nutrients this tool calculates both budgets at once; they remain two independent budgets, each mitigated with its own credits. The nutrient budget is (waste water − current land use + (future land use − SuDS)) × 1.2, where the ×1.2 is Natural England's 20% precautionary buffer. Waste-water load = occupancy × units × water use (l/p/d, incl. NE's +10 l/p/d allowance) × 365 × nutrient concentration (mg/l) ÷ 1,000,000. For mains drainage the concentration is the waste water treatment works permit (with a separate post-2030 figure where a WINEP upgrade applies); for off-mains, NE's default total-nitrogen concentrations are 96.3 mg/l (septic tank) and 72.9 mg/l (package treatment plant), and total-phosphorus 11.6 mg/l (septic tank) and 9.7 mg/l (package treatment plant). One credit mitigates 1 kg of the nutrient per year. The land-use export coefficients vary by catchment, soil drainage type, rainfall band and NVZ status — this tool exposes them as editable fields so you can enter the value from the official Natural England calculator's lookup for your site. Where your LPA or Natural England require the statutory calculation, reproduce these figures in the current official NE catchment calculator. This tool is for guidance and planning support and is not a substitute for that calculator or for ecological/engineering advice.
A fully-branded, planning-ready PDF: catchment, waste-water load, current & future land use, SuDS, the pre- and post-2030 nutrient budget(s), the credits required and full methodology notes. Dual-nutrient catchments include both the nitrogen and phosphorus assessment.
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