| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| Ekman Recycling Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Elan Valley Trust | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Endurmeta Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Eurolago-e-Foresta Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Eurolago-e-Foresta Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Fairways care ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Future Valleys Consortium | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Future Valleys Consortium | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Future Valleys Consortium | | | Environmental Violation | 2022 | UK-NRW | £0 |
| G F Grigg Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Garan Farms Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| GD Environmental Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Gos Tool and Engineering Services Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Gower Chemicals Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Green Skips (Environmental)Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Green Steel Works Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Ground Source Solutions Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| GTR Aggregates & Recycling Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| GTR Aggregates & Recycling Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Hafren Dyfrdwy Cymru | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Hillcroft Garage Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Hilltop honey Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Hughes & John | | | Environmental Violation | 2022 | UK-NRW | £0 |
| International Safety Components Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| IW Morgan Farms Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| J Bros Investments Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| J G Francis Civil Engineering Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| J Humphreys Ground Works Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| James Moore Electrical Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| John Davies Agricultural and Plant Contractor Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| John Jones & Son Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| KDK Metals Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| KH Thomspon and Partners | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Kimberly Hydro Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Knauf Insulation Ltd. | Knauf | building materials | Environmental Violation | 2022 | UK-NRW | £0 |
| Lawrenny enterprise Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| LEL (Properties) Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Lewis Civil Engineering Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Llanelec Precision Engineering Co Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Llanidloes Rugby Football Club Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Llanmoor Development CO. Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Lovell Homes | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Magnox Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Magnox Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Milano D&D Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Moorland Environmental Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Morgan Sindall Construction & Infrastructure Ltd | Morgan Sindall Group PLC | construction and engineering | Environmental Violation | 2022 | UK-NRW | £0 |
| Morgan Sindall Construction & Infrastructure Ltd | Morgan Sindall Group PLC | construction and engineering | Environmental Violation | 2022 | UK-NRW | £0 |
| Morganstone Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| NAG Recycling Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Nant Cribba Barns Management Company Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| National Grid Plc | National Grid | utilities and power generation | Environmental Violation | 2022 | UK-NRW | £0 |
| NRW (IDD) | | | Environmental Violation | 2022 | UK-NRW | £0 |
| NW Construction Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| NWF Fuels Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Penlan Argoed Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Perdez Pas Cyf | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Persimmon Homes Limited | Persimmon PLC | construction and engineering | Environmental Violation | 2022 | UK-NRW | £0 |
| Peter Harding & Co ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Reclaimed Plastic Polymers Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Redrow Plc | Redrow PLC | construction and engineering | Environmental Violation | 2022 | UK-NRW | £0 |
| Redrow Plc | Redrow PLC | construction and engineering | Environmental Violation | 2022 | UK-NRW | £0 |
| Reindeer Lodge Ltd. | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Rexel UK Ltd | Rexel | wholesalers | Environmental Violation | 2022 | UK-NRW | £0 |
| Roger Jones Hiab & Plant Services | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Russell Francis Haulage Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Sensient Flavors Limited | Sensient Technologies | chemicals | Environmental Violation | 2022 | UK-NRW | £0 |
| SL Recycling Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Stately Albion LTD | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Stormy Farm Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Taylor Plant Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Tegfan Recycling | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Tegfan Recycling | | | Environmental Violation | 2022 | UK-NRW | £0 |
| The Eagles Hotel Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| The Eurogroup / Europest Environmental Services | | | Environmental Violation | 2022 | UK-NRW | £0 |
| The Range | | | Environmental Violation | 2022 | UK-NRW | £0 |
| The Slate Centre Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| The Solutions Factory Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Thomas Waste Management Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| TIMET Waunarlwydd | Berkshire Hathaway | diversified | Environmental Violation | 2022 | UK-NRW | £0 |
| Toby carvery | Mitchells & Butlers PLC | restaurants and foodservice | Environmental Violation | 2022 | UK-NRW | £0 |
| Tom Prichard Contracting Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Tom Pritchard Contracting Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Tower Regeneration Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Tradebe Healthcare National Limited | Tradebe | waste management and environmental services | Environmental Violation | 2022 | UK-NRW | £0 |
| Transcend Packaging Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Trojan-Mek Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| TXO Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| UPM-Kymmene UK Ltd | UPM | paper and packaging | Environmental Violation | 2022 | UK-NRW | £0 |
| Valero Pembrokeshire Oil Terminal Ltd | Valero Energy | oil and gas | Environmental Violation | 2022 | UK-NRW | £0 |
| Walters U.K. Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Warwick International Group Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
