4f4c4942-4343-5764-6473-313235363031 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-10-10T13:29:53.683Z NRW 1.0 wel British National Grid (EPSG::27700) Nutrients Review 2023 Nutrients Review 2023 2024-06-01 NRW_DS125601 On the 1st April 2021, The Water Resources (Control of Agricultural Pollution) (Wales) Regulations 2021 came into force. The regulations revoke and replace the Nitrate Pollution Prevention (Wales) Regulations 2013. The objective of the new regulations is to reduce losses of pollutants from agriculture to the environment by setting rules for certain farming practices. With the implementation of the new Regulations, at WG’s request, NRW appointed consultants (Arup) to undertake a review of nutrients in water bodies across Wales to develop a national scale understanding of the current baseline nutrient water quality and assess potential nutrient risks. The nutrient review covers both nitrate and phosphate, which are considered to be the key nutrients contributing to poor water quality. The review has assessed the following water bodies in Wales: · Groundwater; · Surface water (rivers); · Lakes; and · Transitional and Coastal (TraC) waters. The methodology used in the review broadly followed the previous method used for the 2017 NVZ review (NRW_DS116240) but has been adapted to incorporate the assessment of phosphate. The methodologies represent a consistent and practical approach to identification of potentially polluted waters across Wales. On the 1st April 2021, The Water Resources (Control of Agricultural Pollution) (Wales) Regulations 2021 came into force. The regulations revoke and replace the Nitrate Pollution Prevention (Wales) Regulations 2013. The objective of the new regulations is to reduce losses of pollutants from agriculture to the environment by setting rules for certain farming practices. With the implementation of the new Regulations, at WG’s request, NRW appointed consultants (Arup) to undertake a review of nutrients in water bodies across Wales to develop a national scale understanding of the current baseline nutrient water quality and assess potential nutrient risks. The nutrient review covers both nitrate and phosphate, which are considered to be the key nutrients contributing to poor water quality. The review has assessed the following water bodies in Wales: · Groundwater; · Surface water (rivers); · Lakes; and · Transitional and Coastal (TraC) waters. The methodology used in the review broadly followed the previous method used for the 2017 NVZ review (NRW_DS116240) but has been adapted to incorporate the assessment of phosphate. The methodologies represent a consistent and practical approach to identification of potentially polluted waters across Wales. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Hydrography GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme nitrates (nitrogen) phosphates nutrients phosphorus nutrient pollution Nitrate directive NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords no limitations Open Government Licence English environment SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -5.311 -2.647 51.384 53.427 2023-01-01 2023-12-31 Geographic Information System ESRI Feature Class Geographic Information System Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false The methods used in this review largely follows the 2016 NVZ methodology. We did this to allow the results to be compared with those previous assessment of waters polluted by nutrients from agricultural sources. There are differences and these include; · Phosphorous has been included in addition to Nitrogen. This gives a better understanding of the potential effects of nutrients in our waters as both are important in the nutrient cycle and both should be considered when looking at measures to reduce the nutrient inputs to our waters. · Modelling has combined both agricultural and urban land use while previous reviews used them individually (land use type and individual inputs can still be seen separately in the spatial layers on the dashboard). · More land use types have been used (previous reviews used a maximum 5 land types while this review uses 17). · The same apportionment has been used across all water types (different methods used previously). · Due to the anomalous nutrient results affecting some WQ data, orthophosphate and total oxidised nitrogen (TON) monitoring data from 2014 – 2016, that data has been excluded from this review. The methods used in this review largely follows the 2016 NVZ methodology. We did this to allow the results to be compared with those previous assessment of waters polluted by nutrients from agricultural sources. There are differences and these include; · Phosphorous has been included in addition to Nitrogen. This gives a better understanding of the potential effects of nutrients in our waters as both are important in the nutrient cycle and both should be considered when looking at measures to reduce the nutrient inputs to our waters. · Modelling has combined both agricultural and urban land use while previous reviews used them individually (land use type and individual inputs can still be seen separately in the spatial layers on the dashboard). · More land use types have been used (previous reviews used a maximum 5 land types while this review uses 17). · The same apportionment has been used across all water types (different methods used previously). · Due to the anomalous nutrient results affecting some WQ data, orthophosphate and total oxidised nitrogen (TON) monitoring data from 2014 – 2016, that data has been excluded from this review.