| Chemcycle Environmental Management Limited | Merthyr Tydfil | 1998 |
| Chemdose Limited | Goole | 2006 |
| Chemfusion Ltd | London | 2012 |
| Chemgo Limited | Bromsgrove | 2003 |
| Chemical Compliance Services Limited | Bedford | 2015 |
| Chemical Treatment Services (Ireland) Limited | Belfast | 1984 |
| Chemkel Limited | Birkenhead | 2007 |
| Chemolve Ltd | London | 2024 |
| Chempar Limited | | 2000 |
| Chemwaste Disposals Limited | Keighley | 2025 |
| Chenery’S Load & Go Ltd | Norwich | 2023 |
| Cherished Companion Ltd | Glossop | 2024 |
| Chernozem Defence Systems Ltd | London | 2026 |
| Cherry Field Limited | Edinburgh | 2014 |
| Cherry Hill Waste Limited | Newcastle Under Lyme | 1998 |
| Cherry Recycling Ltd | Craigavon | 2022 |
| Chesfaith Ltd | Liverpool | 2020 |
| Cheshire Clearance Ltd | Tarporley | 2024 |
| Cheshire Drainage Solutions Ltd | Calder Island Way | 2021 |
| Cheshire Granulating Services Ltd | Hyde | 2012 |
| Cheshire Green Waste Limited | Altrincham | 2015 |
| Cheshire Soils and Aggregates Limited | Sale | 2020 |
| Cheshire Waste Solutions Ltd | Hyde | 2026 |
| Cheshire West Recycling Limited | Winsford | 2019 |
| Cheshirepaperplastics Ltd | Sandbach | 2022 |
| Cheshunt Metals Ltd | Waltham Cross | 2012 |
| Chest Recycling Limited | Chesterfield | 2024 |
| Chester Finance & Leasing (Environmental) Limited | Wrexham | 2018 |
| Chester Finance & Leasing Management Limited | Sheffield | 2017 |
| Chesterfield Metals Ltd | Chesterfield | 2013 |
| Chesterton Farm Sewage Treatment Management Limited | Bridgnorth | 2003 |
| Chestnut Cleaning Solutions (UK) Ltd | Hornchurch | 2020 |
| Chevgreen Ltd | London | 2023 |
| Chic of Gainsborough Limited | Gainsborough | 2012 |
| Chief Recycling Services Ltd | Clitheroe | 2020 |
| Chiltern Mains Ltd | Chinnor | 1996 |
| Chiltern Secure Shredding Limited | Aylesbury | 2009 |
| Chiltern Water & Environment Limited | Derby | 2012 |
| Chiltern Water Systems Limited | Aylesbury | 2026 |
| Chiltern Wood Recycling Project | Swanage | 2008 |
| Chilwood Limited | Manchester | 1989 |
| Chine Hill Cottages Management Limited | Dorchester | 2018 |
| Chiron Media Ltd | Reading | 2017 |
| Chiswick Rubbish Clearance London Ltd | Iver | 2024 |
| Chiswick Skips Limited | Maidenhead | 2013 |
| CHL Clearance Services Ltd | London | 2025 |
| CHL Site Services Ltd | Falkirk | 2021 |
| Chloros Environmental Ltd | Romsey | 2008 |
| Chobham Car Spares Limited | Surrey | 2001 |
| Choice Connect Ltd | Liverpool | 2019 |
| Choice Holdings (UK) Limited | Milton Keynes | 2012 |
| Choice Packaging Solutions Limited | Milton Keynes | 1997 |
| Choice Trading International Limited | Milton Keynes | 2004 |
| Choice Waste Management Ltd | Milton Keynes | 2019 |
| Cholderton and District Water Company Limited | Nr Salisbury | 1939 |
| Chorley Green Environmental Limited | St Helens | 2026 |
| Chowdhury Metals Exporter (UK) Limited | Birmingham | 2006 |
| CHP (Midlands) Ltd. | Mansfield | 2016 |
| CHP Polymers Ltd | Sheffield | 2021 |
| Chris Carey Collections Limited | Beckenham | 2003 |
| Chris White Grab Hire Limited | Sheffield | 2025 |
| Chrishall Grange Water Limited | Cambridge | 2023 |
| Chrissantus Investment Limited | Kirkliston | 2016 |
| Christopher Ball & Daughters Ltd | Ashford | 2013 |
| Chromenet Limited | Swansea | 2004 |
| Chronia Ltd | London | 2023 |
| Chrono Works Groups Ltd | Slough | 2026 |
| Chuck IT OOT Ltd | Aberdeen | 2023 |
| Chudy Waste Collection Ltd | Edinburgh | 2022 |
| Chums Clearance Ltd | Surbiton | 2021 |
| Chunk's Rubbish Removal Limited | Folkestone | 2020 |
| Chunky Junk Ltd | Hounslow | 2018 |
| Church Farm Barns Limited | Worcester | 2000 |
| Church Road Motors (Bradmore) Limited | Wolverhampton, | 1971 |
| Churchill Enviro Ltd | Altrincham | 2005 |
| Churchill Waste Management Limited | Towcester | 1996 |
| Churchill Waste Services Limited | Waterlooville | 2020 |
| Churchills Services Ltd | London | 2019 |
| Churngold Remediation Limited | Hallen | 1992 |
| CIB Lello Plant Hire Limited | Hayle | 2004 |
| Cibotrans Ltd | Basingstoke | 2024 |
| Cibus Waste Limited | Bexhill | 2019 |
| CID Waste Removal Services Ltd | Criccieth | 2026 |
| CIL Europe Limited | Stanley | 2012 |
| CIL Hygiene Limited | Stanley | 2012 |
| Cimelia Limited | Marlow | 2009 |
| Cinco Recycling Limited | London | 2022 |
| Cipp Systems Limited | Nottingham | 2001 |
| Circa Removal Ltd | High Wycombe | 2023 |
| Circa Waste Ltd | London | 2025 |
| Circalium Limited | Olney | 2025 |
| Circle Europe Ltd | Nottingham | 2021 |
| Circle Recycling Limited | Bolton | 2003 |
| Circle Waste Ltd | Telford | 2018 |
| CIRCLE-8 Group Limited | London | 2023 |
| Circlon OIL and Energy Ltd | Ipswich | 2026 |
| Circoil Ltd. | Ipswich | 2024 |
| Circom Fibres Ltd | Coventry | 2015 |
| Circom Limited | Coventry | 2013 |
| Circom Recycling Ltd | Coventry | 2015 |