| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2021 | UK-NRW | £0 |
| Dyfi Skip Hire | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Easy Going Hydro Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| EB Whittal-Williams & Partners | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Em1Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Endurmeta Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Euroforest Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Evan Pritchard Contractors Ltd. | | | Environmental Violation | 2021 | UK-NRW | £0 |
| EW Hartt & Sons | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Falcondale Country House Estate Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Fforest Farms (Pembrokeshire) Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Forestry Land Consultant LTD | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Fred Lloyd & Sons | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Future Valleys Consortium | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Gamber logistics Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Garth Holiday Park | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Goldhill Contracting Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Gordon Avenue Investments Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| GPM Jones & Sons | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Green Valley Farming Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| GTR Aggregates & Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| GTR Aggregates & Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| GTR Aggregates & Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Gwynedd Skip & Plant Hire Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| H.K. Motors Wales Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| H2O Water Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Hafren Dyfrdwy Cymru | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Hafren Dyfrdwy Cymru | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Hafren Dyfrdwy Cymru | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Hafren Dyfrdwy Cymru | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Hafren Dyfrdwy Cymru | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Harpland Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Haven Garreg Wen Caravan Park | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Heatherdale Holidays (Clarach Bay) Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Install Waste Management Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Interserve Construction Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| J G Hale Construction Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| J H Jones Woodcraft Fencing Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| J W C George & Sons | | | Environmental Violation | 2021 | UK-NRW | £0 |
| JEHU Project Services Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Jolada Hydraroll Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Jonsel Management Black Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Kier Integrated Services Limited | Kier Group PLC | construction and engineering | Environmental Violation | 2021 | UK-NRW | £0 |
| Knightmovers Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| L J Cook & Sons Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lanes Group Plc | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Leekes Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lelo Metal Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lelo Metal Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| LEM Sporting Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lewis Homes (South Wales) Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lewis Homes (South Wales) Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Llaethdy Plasbach Dairy LTD | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Llanmoor Development Co Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Llanmoor Development Co Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lordan UK | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lovell Partnerships Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| M D Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| M&M Greene Haulage Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Maes Gwyrdd Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Magnox Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| McCarthy Contractors (Bridgend) Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| McCarthy Contractors (Bridgend) Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Mitie Technical Facilities Management | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Mixit Concrete Services Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Morganstone Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Morrison Water Services Limited | PAI Partners | private equity (including portfolio companies) | Environmental Violation | 2021 | UK-NRW | £0 |
| Morrison Water Services Limited | PAI Partners | private equity (including portfolio companies) | Environmental Violation | 2021 | UK-NRW | £0 |
| N Meakin Contracts Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| NBA Developments Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Newbridge Energy Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Newbridge Energy Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Newbridge Energy Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Newport Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Ni Tri Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Noel Fitzpatrick Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| North Wales Roofing Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Novidon Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| NRW - Mid Wales - Powysland IDD [Redacted] | | | Environmental Violation | 2021 | UK-NRW | £0 |
