Top Water Utility Companies in the UK
There are 2,008 water utility companies in the UK. This page breaks that total down the way a list actually gets built — by sub-industry, by location, and by company size — so you can see how big the addressable slice is before you commit budget to a campaign.
Leading water utility companies
Ranked by employee band. Companies House does not publish revenue, and its employee figures are unreliable, so bands come from verified company profiles.
| # | Company | Website | Employees |
|---|---|---|---|
| 1 | Aggreko | aggreko.com | 5,001–10,000 |
| 2 | Octopus Energy | octopus.energy | 1,001–5,000 |
| 3 | National Grid | nationalgrid.com | 10,000+ |
| 4 | EDF (UK) | edfenergy.com | 10,000+ |
| 5 | SSE plc | sse.com | 10,000+ |
| 6 | ScottishPower | scottishpower.com | 5,001–10,000 |
| 7 | Centrica | centricabusinesssolutions.com | 10,000+ |
| 8 | British Gas | britishgas.co.uk | 10,000+ |
| 9 | Rolls-Royce SMR | rolls-royce-smr.com | 501–1,000 |
| 10 | Thames Water | thameswater.co.uk | 1,001–5,000 |
| 11 | Severn Trent | severntrent.com | 5,001–10,000 |
| 12 | UK Power Networks | ukpowernetworks.co.uk | 5,001–10,000 |
| 13 | OVO | ovo.com | 5,001–10,000 |
| 14 | Sizewell C | sizewellc.com | 201–500 |
| 15 | United Utilities | unitedutilities.com | 5,001–10,000 |
| 16 | E.ON UK | eonenergy.com | 10,000+ |
| 17 | Yorkshire Water | yorkshirewater.com | 1,001–5,000 |
| 18 | Anglian Water Services | anglianwater.co.uk | 5,001–10,000 |
| 19 | Scottish Water | scottishwater.co.uk | 1,001–5,000 |
| 20 | National Grid ESO | nationalgrideso.com | 1,001–5,000 |
| 21 | Northern Powergrid | northernpowergrid.com | 1,001–5,000 |
| 22 | Drax Group | drax.com | 1,001–5,000 |
| 23 | SSEN Transmission | ssen-transmission.co.uk | 1,001–5,000 |
| 24 | ENGIE UK | engie.co.uk | 10,000+ |
| 25 | Cadent | cadentgas.com | 5,001–10,000 |
| 26 | Southern Water | southernwater.co.uk | 1,001–5,000 |
| 27 | Ecotricity | ecotricity.co.uk | 501–1,000 |
| 28 | SP Energy Networks | spenergynetworks.co.uk | 1,001–5,000 |
| 29 | National Energy System Operator | neso.energy | 1,001–5,000 |
| 30 | OCU | ocugroup.com | 1,001–5,000 |
| 31 | Scottish and Southern Electricity Networks | ssen.co.uk | 1,001–5,000 |
| 32 | Dŵr Cymru Welsh Water | dwrcymru.com | 1,001–5,000 |
| 33 | Morrison Water Services | morrisonws.com | 1,001–5,000 |
| 34 | Utility Warehouse | uw.co.uk | 1,001–5,000 |
| 35 | Utilita Energy | utilita.co.uk | 1,001–5,000 |
| 36 | Ofwat | ofwat.gov.uk | 201–500 |
| 37 | NWG (Northumbrian Water Group) | nwl.co.uk | 1,001–5,000 |
| 38 | SGN | sgn.co.uk | 1,001–5,000 |
| 39 | Wessex Water | essexwater.co.uk | 1,001–5,000 |
| 40 | National Gas | nationalgas.com | 1,001–5,000 |
| 41 | Good Energy | goodenergy.co.uk | 201–500 |
| 42 | Globeleq | globeleq.com | 501–1,000 |
| 43 | South West Water | southwestwater.co.uk | 1,001–5,000 |
| 44 | SP Electricity North West | enwl.co.uk | 1,001–5,000 |
| 45 | Bulb | bulb.co.uk | 501–1,000 |
| 46 | SSE Energy Solutions | sseenergysolutions.co.uk | 1,001–5,000 |
| 47 | Western Power Distribution | esternpower.co.uk | 5,001–10,000 |
| 48 | Vital Energi Utilities Limited | vitalenergi.co.uk | 501–1,000 |
| 49 | Network Plus | networkplus.co.uk | 5,001–10,000 |
| 50 | M Group | mgroupltd.com | 5,001–10,000 |
Need the full list with verified decision-maker contacts? Book a meeting.
The largest sub-industry is water collection, treatment and supply with 1,648 companies, which is where most water utility outbound in the UK ends up pointed. The tail below it is usually less contested and worth a separate sequence.
Geographically it concentrates in London (266 companies), followed by Manchester, Leeds, Birmingham. If your reps work by territory, that split is the fastest way to divide the list.
By headcount, 287 are micro companies of 1–9 people and 49 sit in the 10–249 range — usually the sweet spot for outbound, since they are large enough to have a budget holder and small enough that the decision maker answers.
Water Utility by sub-industry
| Sub-industry | Companies |
|---|---|
| Water collection, treatment and supply | 1,648 |
| Other manufacturing | 200 |
| Manufacture of other furniture | 62 |
| Manufacture of chairs and seats | 42 |
| Manufacture other office & shop furniture | 35 |
| Manufacture of games and toys | 8 |
| Manufacture of other kitchen furniture | 4 |
| Manufacture of sports goods | 3 |
| Manufacture of jewellery & related | 3 |
| Manufacture of mattresses | 2 |
Where water utility companies are based
| City | Companies |
|---|---|
| London | 266 |
| Manchester | 47 |
| Leeds | 38 |
| Birmingham | 37 |
| Cardiff | 36 |
| Glasgow | 36 |
| Liverpool | 15 |
| Nottingham | 14 |
| Norwich | 14 |
| Sheffield | 14 |
Water Utility by company size
| Employees | Companies |
|---|---|
| 1–9 | 287 |
| 10–49 | 45 |
| 50–249 | 4 |
| 250–999 | 1 |
Headcount is published for 474 of these companies; the rest are in the database without a size band.
Frequently asked questions
How many water utility companies are there in the UK?
Our data covers 2,008 water utility companies in the UK, sourced from Companies House and refreshed continuously.
Can I get decision-maker contacts for water utility companies?
Yes. Every company record can be paired with verified decision-maker contacts — names, job titles, verified email addresses and direct phone numbers. Book a meeting and we will scope the list against your ICP.
How is the water utility segment defined?
Companies are classified using official industry codes from the business register, not keyword guesses on company names, so the segment boundaries match what the company actually registered as.