| Pilkington Asbestos Removal Services Ltd | | | Environmental Violation | 2018 | UK-NRW | £0 |
| Queensferry Car Breakers Limited, c/o Mechan Accountants | | | Environmental Violation | 2018 | UK-NRW | £0 |
| RR Davies Ltd | | | Environmental Violation | 2018 | UK-NRW | £0 |
| South Wales Wood Recycling Limited | | | Environmental Violation | 2018 | UK-NRW | £0 |
| Tata Steel UK Ltd | Tata Group | diversified | Environmental Violation | 2018 | UK-NRW | £0 |
| TJ's Skip Hire Ltd | | | Environmental Violation | 2018 | UK-NRW | £0 |
| City Skips (NW) Limited | | | Environmental Violation | 2019 | UK-NRW | £0 |
| ComBigaS Denmark | | | Environmental Violation | 2019 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2019 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2019 | UK-NRW | £0 |
| Gethin Davies & Son | | | Environmental Violation | 2019 | UK-NRW | £0 |
| J M & L R Reynolds | | | Environmental Violation | 2019 | UK-NRW | £0 |
| Leekes Limited | | | Environmental Violation | 2019 | UK-NRW | £0 |
| Mason & Reynolds Holdings Ltd | | | Environmental Violation | 2019 | UK-NRW | £0 |
| NAG Recycling Ltd | | | Environmental Violation | 2019 | UK-NRW | £0 |
| Rees Metals | | | Environmental Violation | 2019 | UK-NRW | £0 |
| Stonewest Construction Limited | | | Environmental Violation | 2019 | UK-NRW | £0 |
| World Care (Wales) Limited | | | Environmental Violation | 2019 | UK-NRW | £0 |
| Alun Griffiths (Contractors) Limited | CRH PLC | building materials | Environmental Violation | 2020 | UK-NRW | £0 |
| Matthew Jeavons MJ Rubbish Removals Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Endurmeta Ltd | | | Environmental Violation | 2018 | UK-NRW | £0 |
| Dwr Cymru Cyfyngedig | Dwr Cymru Cyfyngedig (Welsh Water) | utilities and power generation | Environmental Violation | 2018 | UK-NRW | £0 |
| DB & RM Edwards & Sons | | | Environmental Violation | 2018 | UK-NRW | £0 |
| Mainline Pipelines Limited | | | Environmental Violation | 2018 | UK-NRW | £0 |
| World Care (Wales) Limited | | | Environmental Violation | 2017 | UK-NRW | £0 |
| Cuddy Demolition and Dismantling Limited Retirement Benefit Scheme | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Ammanford Recycling Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Powys Environmental Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Derwen Llyn Construction Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Prichards Remediation Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Withey Developments Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| ByProduct Recovery Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| D S Rubbish Removals Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Rockwool Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Peter Davies Agricon Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| St David's Leisure LTD | | | Environmental Violation | 2021 | UK-NRW | £0 |
| South West Wood Products Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Trehaven Leisure Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Ammanford Recycling Limited | | | Environmental Violation | 2023 | UK-NRW | £0 |
| Lewis Homes (South Wales) Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Befesa Salt Slags Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Ammanford Recycling Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Asbestos North West & Wales | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Caernarvonshire Crown Slate Quarries Company Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Celtic Heritage Construction and Stonemasonary Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Fountains Forestry Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| LT's Tyres and Autos Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Par Contractors Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Pembrokeshire Holdings Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Pontnewydd Golf Course | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Project Yellow Recycling Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Seda UK Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Thermalguard Consulting Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Treborth Leisure ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Williams Brothers | | | Environmental Violation | 2020 | UK-NRW | £0 |
| AQA (Cardiff) Ltd. | | | Environmental Violation | 2021 | UK-NRW | £0 |
| BDC Aggregates | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Berwyn Hydro Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| D R & E G Davies Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Lance Williams Roofing ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Morgan Evans and Company Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Refrigeration Norwest | | | Environmental Violation | 2021 | UK-NRW | £0 |
| W J Owen & Sons Ltd | | | Environmental Violation | 2021 | UK-NRW | £0 |
| Walters U.K. Limited | | | Environmental Violation | 2021 | UK-NRW | £0 |
| BT GROUP PLC | BT | telecommunications | Environmental Violation | 2022 | UK-NRW | £0 |
| Cheshire & North Wales Sand & Gravel Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Dysynni Developments LTD | | | Environmental Violation | 2022 | UK-NRW | £0 |
| eCube Solutions limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Future Valleys Consortium | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Greens Recycling (Wales) Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| JDM Contractors Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Marquette Metal Recycling Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Merthyr (South Wales) Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| RDR Woodchip Ltd | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Royal St. David's Golf Club Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| SGG Developments Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Teifi Trout Association | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Tu Mewn Cyfyngedig | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Welsh Tyre Recycling Services Limited | | | Environmental Violation | 2022 | UK-NRW | £0 |
| Ammanford Recycling Limited | | | Environmental Violation | 2023 | UK-NRW | £0 |
| Enzos Homes Ltd | | | Environmental Violation | 2023 | UK-NRW | £0 |
| New Horizons Biofuel and Animal Beddings Co Ltd | | | Environmental Violation | 2023 | UK-NRW | £0 |
| Ty Mawr West Limited | | | Environmental Violation | 2023 | UK-NRW | £0 |
| A & D Evans & Sons | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Abertawe Metals Recycling Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| ACD Skips Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| AJ & CJ Powell & Son | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Alun Griffiths (Contractors) Limited | CRH PLC | building materials | Environmental Violation | 2020 | UK-NRW | £0 |
| Anglesey Turf Company Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Apple County Cider Co Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Arch Services (UK) Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| B E Baker & Sons Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Balfour Beatty Civil Engineering Ltd | Balfour Beatty | construction and engineering | Environmental Violation | 2020 | UK-NRW | £0 |
| Barratt Homes South Wales | Barratt Redrow | real estate | Environmental Violation | 2020 | UK-NRW | £0 |
| Barratt Homes South Wales | Barratt Redrow | real estate | Environmental Violation | 2020 | UK-NRW | £0 |
| Befesa Salt Slags Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| BG Carey & Sons | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Bob Gay Plant Hire Ltd | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Breedon Group plc | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Browns Recycling Group Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
| Bryn Aggregates Limited | | | Environmental Violation | 2020 | UK-NRW | £0 |
