RM — Romford
Who supplies water in the RM postcode area?
Essex & Suffolk Water and Thames Water supply addresses in RM, which covers Romford, Hornchurch, Dagenham, Upminster and Grays. Water is not a market you can shop in — the supplier comes with the address.
Essex & Suffolk Water
Water onlySupplies drinking water to two separate areas — much of Essex, and a part of Suffolk around Lowestoft. Sewerage is Anglian Water's or Thames Water's depending on where the property sits. It trades as part of Northumbrian Water.
Thames Water
Water and sewerageSupplies water and takes waste water across London and the Thames Valley. It is the largest water company in the UK by number of customers. In outer London and the home counties the taps are often supplied by Affinity Water or SES Water while Thames Water still handles the sewerage.
More than one company appears here either because RM straddles a boundary, or because one company supplies the drinking water while another takes the waste water away. Your bill will say which applies to your address.
Places in the RM postcode area
A sample, not the full list. RM is the postcode area — the letters before the first digit — so it covers every RM outward code.
Check a different postcode
A few useful answers
Common questions
Who supplies water in the RM postcode area?
Essex & Suffolk Water and Thames Water supply parts of the RM postcode area. The supplier is decided by where the property is, not by who lived there before you.
Can I switch water supplier in RM?
No. Household water supply is not a competitive market anywhere in the UK — there is one supplier for each address and no tariff to compare. What you can change is how you are charged, by asking for a meter.
Why does this page list more than one company for RM?
A postcode area can straddle a boundary, and in much of England the company that supplies the taps is not the one that takes the waste water away. Both appear here so you can check which applies to your address.
Do I need to open a water account when I move in?
Yes. Tell the supplier the day your tenancy starts and give an opening meter reading if the property has a meter, so you are not billed for what the last tenant used.
Where to confirm this
We hold the supplier at postcode-area level, which is coarse enough to be wrong at a boundary. These are the industry's own sources, and they settle it for a specific address.
- Water UK: find your supplier ↗
- the Consumer Council for Water: complaints and advice ↗
- Discover Water: bills by company ↗Sector average £639 a year for 2026–27.
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