| Wastecomparison Ltd | London | 2025 |
| Wastecraft Ltd | Barnsley | 2011 |
| Wasted (NE) Limited | Gateshead | 2021 |
| Wasteease Limited | Leicester | 2024 |
| Wastefair Ltd | London | 2021 |
| Wasteflex Solutions Ltd | Dagenham | 2025 |
| Wasteflow UK Limited | Sheffield | 2016 |
| Wasteflow Ventures Limited | Birmingham | 2026 |
| Wasteflux Ltd | Letchworth Garden City | 2026 |
| Wastefront Limited | Warwick | 2020 |
| Wastefront Sunderland Limited | Warwick | 2020 |
| Wastege Waste Management Limited | North Ferriby | 2007 |
| Wastehub Ltd | London | 2025 |
| Wasteline Effluent Services Limited | St Asaph | 2012 |
| Wasteline Limited | Manchester | 2026 |
| Wasteline Recycling Limited | Loughton | 2013 |
| Wasteline Services Limited | Leicester | 1994 |
| Wastelink Ltd | Doncaster | 2025 |
| Wasteman Inc Ltd | Bristol | 2022 |
| Wasteman Ltd | Caterham | 2025 |
| Wasteman Removals Limited | Paisley | 2025 |
| Wasteman Services Ltd | Ilford | 2023 |
| Wasteman Skips Limited | Arundel | 2023 |
| Wastemanz Ltd | Birmingham | 2019 |
| Wastemaster Energy Limited | Rotherham | 2017 |
| Wastemen Clearance Ltd | London | 2021 |
| Wastenator Limited | Mitcham | 2019 |
| Wastenotts (Reclamation) Limited | Doncaster | 1991 |
| Wastenotts O&M Services Limited | Doncaster | 1991 |
| Wasteplas Limited | Chester | 2023 |
| Wasteqhse Ltd | Redcar | 2017 |
| Wasteremoval Guys Ltd | Cardiff | 2025 |
| Wastergy Ltd | London | 2021 |
| Wastesavers Charitable Trust Limited | Lliswerry | 2005 |
| Wastesavers Limited | Lliswerry | 1999 |
| Wastesolve Limited | Milton Keynes | 2023 |
| Wastestream Services Limited | London | 2022 |
| Wastestrike Limited | Swindon | 2022 |
| Wastesure Ltd | Manchester | 2020 |
| Wastetech Solutions Ltd | Nuneaton | 2025 |
| Wasteva Limited | Manchester | 2025 |
| Wastewater Management Limited | Buxton | 2006 |
| Wastewater Technical Services Ltd | Sheffield | 2013 |
| Wastewise (UK) Limited | Doncaster | 2001 |
| Wastewise Holdings Ltd | Doncaster | 2017 |
| Wastewise Limited | Doncaster | 2009 |
| Wastewise Management Solutions Limited | Sutton Coldfield | 2005 |
| Wastewize UK Limited | Borehamwood | 2018 |
| Wastex and Co Ltd | Seven Kings | 2023 |
| Wastex Solutions Ltd | Radlett | 2026 |
| Wastexchanged Ltd | Loughborough | 2026 |
| Water & Air Management Limited | Manchester | 2013 |
| Water and Drainage Solutions Ltd | Reading | 2020 |
| Water Clear Global UK Ltd | Wells | 2025 |
| Water Design Engineers Limited | High Wycombe | 2017 |
| Water Distribution and Energy Services Limited | Ayrshire | 2006 |
| Water Engineering Industrial Equipment (UK) Ltd | Morden | 2025 |
| Water Environmental Treatment Limited | Rotherham | 1992 |
| Water Filtration Services Ltd | Princes Risborough | 2023 |
| Water for Africa | Stoke-On-Trent | 2005 |
| Water Hall (England) Limited | Nottingham | 1990 |
| Water Hygiene Consultants Ltd | Leeds | 2010 |
| Water Hygiene Limited | London | 2019 |
| Water Hygiene Management Limited | Whyteleafe | 1995 |
| Water Hygiene Services Group Limited | Warwickshire | 2025 |
| Water Hygiene Services Ltd | Leeds | 2006 |
| Water Hygiene Solutions Ltd | Ravensthorpe | 2010 |
| Water Leak Location Services Limited | Waterlooville | 2013 |
| Water Maiden Limited | Preston | 2006 |
| Water Mains Sterilizing Utility Limited | Blackwood | 2005 |
| Water Maxim Limited | Bournemouth | 2004 |
| Water Offsets Ltd | London | 2021 |
| Water on Wheels Limited | Beaconsfield | 2025 |
| Water Operational Solutions Ltd | Preston | 2025 |
| Water Plus Limited | Stoke-On-Trent | 2001 |
| Water Plus Select Limited | Stoke-On-Trent | 1998 |
| Water Processing Limited | Southampton | 2017 |
| Water Quality and Technical Services Ltd | Rugby | 2021 |
| Water Quality Services Ltd | Rugby | 2023 |
| Water Safe Africa Ltd | Wellington | 2022 |
| Water Saving Techniques Limited | Johnstone | 2010 |
| Water Scientific Limited | Reading | 1993 |
| Water Services Corporation Limited | Doncaster | 2014 |
| Water Smart Foundation (WW) | London | 2019 |
| Water Solutions (Europe) Limited | Leeds | 2011 |
| Water Solutions (Hull) Ltd | Hull | 2018 |
| Water Solutions Process Ltd | Mansfield | 2025 |
| Water Supply Services (UK) Ltd | Taunton | 2022 |
| Water Supply Solutions Ltd | Colwyn Bay | 2017 |
| Water System Services Limited | Belper | 2024 |
| Water Tankers London Ltd | Cardiff | 2021 |
| Water Technology Engineering Ltd | York | 2010 |
| Water Technology Systems Ltd | Telford | 2017 |
| Water Today UK Ltd | London | 2023 |
| Water Transfer Limited | Tattershall | 1990 |
| Water Treatment Products Limited | Newport | 1999 |
| Water Treatment Solutions Ltd | Manchester | 2020 |
| Water Treatments & Hygiene Limited | Cannock | 2002 |
| Water Well Solutions Limited | Chesterfield | 2015 |
| Water Worksni Ltd | Antrim | 2026 |