Form

River Eden SAC: nutrient neutrality calculator

Calculate nutrient budgets for developments in the catchment of River Eden SAC.

From:

Natural England

Published:

28 February 2024

Last updated:

11 March 2026

Show all updates

11 March 2026
Calculator updated to reflect catchment boundary changes following review of WINEP upgrades. Wastewater treatment works discharging outside of the revised nutrient neutrality catchment have been set to zero.
1 July 2025
Updated the calculator to show missing values.
26 June 2025
Updated the calculator to resolve minor bug issues.
27 May 2025
Updated the calculator with a version that reflects improvements that will be made to wastewater treatment works between 2025 and 2030. This is under the Water Industry National Environment Programme (WINEP) as published in January 2025. The calculator also reflects earlier completion dates for select wastewater treatment work permit upgrades within the River Eden catchment.
24 May 2024
Updated the calculator with a version that reflects the list of wastewater treatment works that are under a duty to meet specified nutrient removal levels.
28 February 2024
First published.

Applies to England

MS Excel Spreadsheet, 129 KB

Use this calculator to work out the nutrient budget for proposed developments in the catchment of River Eden SAC.

The calculator reflects:

all the wastewater treatment work upgrades required under the new Water Industry Act 1991 duty, as announced in May 2024
improvements that will be made to wastewater treatment works between 2025 and 2030 under the Water Industry National Environment Programme (WINEP), published in January 2025
earlier completion dates for selected wastewater treatment work permit upgrades within the River Eden catchment
catchment boundary changes following review of WINEP upgrades – wastewater treatment works discharging outside the revised nutrient neutrality catchment have been set to zero

Instructions are given in the calculator, but you should also read the guidance document.

Find the guidance and all 27 calculators in the nutrient neutrality resources collection.