| SL Recycling Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Slicker Recycling Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Snowdonia National Park Authority | | | Environmental Violation | 2021 | UK-NRW | £0 |
| St Modwen Developments Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Star Pubs & Bars Limited | Heineken | beverages | Environmental Violation | 2021 | UK-NRW | £0 |
| Sundorne Products (Llanidloes) Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Sundorne Products (Llanidloes) Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| T D Tyre Recycling Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| T M Wiberg Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Taylor Wimpey PLC | Taylor Wimpey PLC | construction and engineering | Environmental Violation | 2021 | UK-NRW | £0 |
| Taylor Wimpey PLC | Taylor Wimpey PLC | construction and engineering | Environmental Violation | 2021 | UK-NRW | £0 |
| The Eurogroup / Europest Environmental Services | | | Environmental Violation | 2021 | UK-NRW | £0 |
| The National Trust | National Trust | miscellaneous services | Environmental Violation | 2021 | UK-NRW | £0 |
| The Pontypridd Golf Club House Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| The Rising Sun (Haverfordwest) LTD | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Thermal Earth Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Thorncliffe Building Supplies Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Ticklock Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Tower Regeneration Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Town & Country Hotels Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Travelodge Hotels Limited | Travelodge Hotels Limited | hotels | Environmental Violation | 2021 | UK-NRW | £0 |
| United World College of The Atlantic | | | Environmental Violation | 2021 | UK-NRW | £0 |
| UPM -- Kymmene (UK) Ltd | UPM | paper and packaging | Environmental Violation | 2021 | UK-NRW | £0 |
| V J Thomas & Son Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Valero Energy Ltd | Valero Energy | oil and gas | Environmental Violation | 2021 | UK-NRW | £0 |
| VG Recycling Group Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Walters U.K. Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| WB & TM Morgan & Son | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Williams Haulage | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Worldcare (wales) Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| WR Services | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Zip World Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| 2 Sisters Food Group Limited | Boparan Holdings Limited | food products | Environmental Violation | 2022 | UK-NRW | £0 |
| Abbey Moulding Contractors | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Aberystwyth University | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Airfield Metals Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Alexander Design Build Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Altrad Services Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| AM Recycling Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| AMG Resources Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| AMG Resources Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| AMOS GROUP LTD | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Anglesey Arms Pub | | | Environmental Violation | 2022 | UK-NRW | £0 |
| AQA (Cardiff) Ltd. | | | Environmental Violation | 2022 | UK-NRW | £0 |
| AQA (Cardiff) Ltd. | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Avalon Insulation Services Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| BDW Trading Limited | Barratt Redrow | real estate | Environmental Violation | 2022 | UK-NRW | £0 |
| Beacon Foods Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Bect Building Contractors Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Bellway Homes Ltd (Wales) | Bellway PLC | construction and engineering | Environmental Violation | 2022 | UK-NRW | £0 |
| Benji & Co. Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Bethel Road Construction Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Bluestone Garden Buildings Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Bluestone Resorts Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Border Bobcat Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Britaniacrest Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Bryn Recycling LTD | | | Environmental Violation | 2022 | UK-NRW | £0 |
| C. Wynne & Sons Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Caerleon Ready Mixed Concrete Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Caersws Recreation Association | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Cambrian Coast Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Castle Cement Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Castle Cement Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Castle Green Homes | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Centregreat Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Cheshire Tarmacadum & Driveways Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Chetwynd Farm LTD | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Chillway Express Specials Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Crynfryn Bychan LTD | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Cware Pantgwyn Quarry Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Cwrt Henri Farms Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| D T Jones & Sons | | | Environmental Violation | 2022 | UK-NRW | £0 |
| D.G.D. Machinery Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Davies Homes Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Davies Motors | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Derwent Renewable Power Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Draycott Group Ltd | | | 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 |
| 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 |
| 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 |
