Research and analysis

Catchment statistics for nutrient pollution

A report giving the catchment-scale source apportionment and estimated diffuse sector reductions required to meet protected area water quality targets.

• From: Environment Agency
• Published: 30 September 2024
• Last updated: 9 October 2026
  Show all updates

  1. 9 October 2026

     The report 'Indicative catchment statistics for nutrient pollution' has been replaced with the updated version 'Catchment statistics for nutrient pollution in protected areas 2026'. Nutrient modelling summaries have been added for the protected area catchments included in the main report.

  2. 1 October 2024

     Fixed an error in table 1 in the PDF. Natural England nutrient neutrality advice doesn't currently apply for Waveney.

  3. 1 October 2024

     Updated table 1 in the full report PDF to add that Natural England nutrient neutrality advice applies for Hornsea Mere, Chesil and The Fleet, and part of Waveney.

  4. 30 September 2024

     First published.

Applies to England

Documents

Catchment statistics for nutrient pollution in protected areas 2026: executive summary

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Catchment statistics for nutrient pollution in protected areas 2026

PDF, 1.9 MB, 66 pages

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Ant Broads and Marshes SSSI nutrient modelling summary

PDF, 685 KB, 14 pages

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Bure Broads and Marshes SSSI nutrient modelling summary

PDF, 763 KB, 14 pages

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Esthwaite Water Ramsar nutrient modelling summary

PDF, 432 KB, 14 pages

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Ouse Washes SAC nutrient modelling summary

PDF, 670 KB, 12 pages

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River Avon (Hampshire) SAC nutrient modelling summary

PDF, 5.54 MB, 21 pages

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River Axe SAC nutrient modelling summary

PDF, 3.94 MB, 21 pages

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River Camel SAC nutrient modelling summary

PDF, 3.83 MB, 21 pages

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River Clun SAC nutrient modelling summary

PDF, 6.44 MB, 31 pages

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River Dee SAC nutrient modelling summary

PDF, 5.65 MB, 21 pages

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River Derwent and Bassenthwaite Lake SAC nutrient modelling summary

PDF, 4.42 MB, 21 pages

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River Derwent (Yorkshire) SAC nutrient modelling summary

PDF, 3.55 MB, 16 pages

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River Eden SAC nutrient modelling summary

PDF, 2.68 MB, 21 pages

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River Ehen SAC nutrient modelling summary

PDF, 1.51 MB, 15 pages

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River Itchen SAC nutrient modelling summary

PDF, 5.09 MB, 21 pages

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River Kent SAC nutrient modelling summary

PDF, 3.45 MB, 21 pages

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River Lambourn SAC nutrient modelling summary

PDF, 3.73 MB, 21 pages

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River Mease SAC nutrient modelling summary

PDF, 4.16 MB, 21 pages

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River Test SSSI nutrient modelling summary

PDF, 5.84 MB, 21 pages

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River Tweed (England) SAC nutrient modelling summary

PDF, 3.41 MB, 21 pages

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River Wensum SAC nutrient modelling summary

PDF, 4.49 MB, 21 pages

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River Wye SAC (including Lugg SAC and SSSI) nutrient modelling summary

PDF, 7.01 MB, 23 pages

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Solent marine sites nutrient modelling summary

PDF, 1.93 MB, 13 pages

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Somerset Levels and Moors Ramsar nutrient modelling summary

PDF, 902 KB, 12 pages

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Stodmarsh SPA nutrient modelling summary

PDF, 539 KB, 14 pages

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Teesmouth and Cleveland Coast SPA nutrient modelling summary

PDF, 1.32 MB, 13 pages

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Waveney Wetland SSSIs nutrient modelling summary

PDF, 819 KB, 14 pages

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Wye Valley (Peaks) SSSI nutrient modelling summary

PDF, 3.43 MB, 21 pages

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Yare Broads and Marshes SSSI nutrient modelling summary

PDF, 877 KB, 14 pages

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Details

These reports are to help those:

• designing or co-ordinating nutrient mitigation schemes
• working on diffuse water pollution plans
• working on site restoration

For the policy information, see Nutrient pollution: reducing the impact on protected sites.

The guidance Nutrient mitigation: check if you need environmental permissions is for developers and other parties creating nutrient mitigation proposals.

See previous versions on this report on the UK government web archive.