Dŵr Cymru Welsh Water average bill (2025/26)
The average Dŵr Cymru Welsh Water household water and sewerage bill is £639 a year in 2025/26 (serving Wales), up £136 (27%) on 2024/25. That is £36 above the England & Wales average of £603, giving a Gera Water Cost Index of 106. Source: Water UK / Ofwat, published January 2025.
Source: Water UK — Annual average bill changes 2025-2026 (echoed by Ofwat). As of . Updated annually · last updated .
2025/26 average bill
£639
per year (water + sewerage)
Change on 2024/25
+£136
27% (from £503)
Gera Water Cost Index
106
100 = England & Wales average
Dŵr Cymru Welsh Water serves Wales. Its average bill is £36 above the England & Wales average of £603 (GWCI 106). You cannot switch water company — it is set by your address.
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Pick your water company and household to see how your bill compares to the published company average and the England & Wales average for 2025/26.
Estimated annual water + sewerage bill (Dŵr Cymru Welsh Water)
£639
- Company average
- £639/yr
- England & Wales avg
- £603/yr
- Gera Water Cost Index
- 106 / 100
Dŵr Cymru Welsh Water’s average bill is £36 above the England & Wales average (GWCI 106).
The company average is the real published 2025/26 figure. The household estimate applies an indicative usage multiplier (a rule of thumb, not a company figure) — your actual bill depends on metered usage, property band, and any social tariff. A metered home often pays less; check your supplier’s charges scheme for an exact figure.
Dŵr Cymru Welsh Water water bills — FAQ
How much is the average Dŵr Cymru Welsh Water bill in 2025/26?
The average Dŵr Cymru Welsh Water household water and sewerage bill is £639 a year in 2025/26, up from £503 in 2024/25 — a rise of £136 (27%). This is the average across Dŵr Cymru Welsh Water's household customers in Wales; your own bill depends on metered usage, property band, and any social tariff. Source: Water UK / Ofwat.
Why did my Dŵr Cymru Welsh Water bill go up?
Dŵr Cymru Welsh Water bills rose 27% (£136) from April 2025 following Ofwat's 2024 price review, which approved company investment programmes for 2025–2030. Across England and Wales the average rise was 26% — the steepest since privatisation. Dŵr Cymru Welsh Water's rise was above that national average.
Is Dŵr Cymru Welsh Water expensive compared to other water companies?
Dŵr Cymru Welsh Water's average bill of £639 is £36 above the England & Wales average of £603, a Gera Water Cost Index of 106 (where 100 = the national average). You cannot switch away from Dŵr Cymru Welsh Water — your water company is set by where you live in Wales. Source: Water UK / Ofwat, 2025/26.
Can I switch away from Dŵr Cymru Welsh Water?
No. The household water market in England and Wales is not open to switching, so you cannot leave Dŵr Cymru Welsh Water for another supplier — it is fixed by your address. You can lower your bill by getting a water meter if you use less than the rateable-value assumption, checking eligibility for a social tariff such as WaterSure, and fixing leaks.
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You can’t switch away from Dŵr Cymru Welsh Water, but a fixed leak or a water-efficient install can cut a metered bill. Book a vetted GeraHome plumber to find leaks or fit water-saving taps, showers and toilets.
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Method & sources
The Gera Water Cost Index (GWCI) re-expresses each company’s published 2025/26 average annual household water + sewerage bill as a ratio to the England & Wales average (£603), indexed so that 100 = the national average. GWCI = round(company average bill ÷ £603 × 100). A GWCI of 120 means the average bill in that company’s area is 20% above the national average; 84 means 16% below. It is computed only from the published figures shown on the page, so anyone can reproduce it. It does not adjust for usage, property band, or social tariffs — it compares published company averages, not individual bills.
Average annual household bills are published by Water UK (the industry body) and echoed by the regulator Ofwat. Reproduced here as public-interest reference figures; per-company numbers cross-verified against multiple independent republications on 2026-06-18. Sources: Water UK — Annual average bill changes 2025-2026 · Ofwat — Average bills 2025/26 press statement. Fetched 2026-06-18. Average bill, not an individual bill — your bill depends on metered usage, property band and any social tariff.