Useful next calculations
Rates and sources, 1 Apr 2026 – 31 Mar 2027
Water UK 2026/27 average household water-and-wastewater bills for England and Wales from 1 April 2026. Optional last-year bills are scaled by the same published company change. Metered charges and social tariffs are not modelled.
| Band or figure | Rate |
|---|---|
| England & Wales average | £639 |
| Change vs previous year | +£33 (5.4%) |
| Prior-year average rise (Ofwat) | +26% / £123 |
| Company range (combined) | £535 – £759 |
Source: Water UK — Annual average bill changes 2026-27. Source checked for 1 Apr 2026 – 31 Mar 2027.
When to use this calculator
- Before switching supplier, upgrading equipment or comparing energy-saving changes.
- When you want to test different usage or price scenarios quickly.
- When you need a simple estimate before requesting installer or supplier quotes.
- When a tariff is about to change and you want to model the bill impact.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Water and wastewater company | England & Wales average |
| Your 2025/26 annual bill (£) — optional | £0 |
For those figures the calculator returns:
- Estimated 2026/27 bill: £639.00
- Monthly average: £53.25
- Change: £33.00 (5.40%)
- Company average: £639.00
- England & Wales average: £639.00
Method & assumptions
This calculator uses Water UK’s published 2026/27 average household bills for water-and-wastewater companies in England and Wales, effective from 1 April 2026. The national average is £639, a rise of £33 (5.4%) on the previous year. Selecting a company shows that company’s average; if you enter your 2025/26 annual bill, the same published increase is applied to your figure. Ofwat separately reported that 2025/26 bills rose by an average of 26% or £123.
Figures are industry averages, not a meter-based bill or a price cap on your household. Metered charges, occupancy, rateable-value unmetered tariffs, social tariffs and water-only plus wastewater splits will differ. Check your company’s charges scheme and contact them or CCW if you cannot pay.
Common mistakes
- Using the current tariff without testing a higher unit rate.
- Forgetting the standing charge when comparing annual bills.
- Treating the result as a supplier quote.
- Using optimistic savings figures for an upgrade without a written estimate.
What to do next
- Run the same scenario with a 10% higher unit rate.
- Compare this result with a related energy calculator before requesting installer quotes.
- If you are evaluating an upgrade, rerun with actual quote figures.
- Set a reminder to rerun the calculation when your tariff renews.