The unit price is only part of the bill
Adding the clean-water and wastewater rates gives a useful marginal cost, but it will not reproduce the full bill because standing charges apply. Some companies also use charging zones or different wastewater-return assumptions.
Convert litres to cubic metres
Divide litres by 1,000. A household using 300 litres a day uses 109.5 m³ a year: 300 × 365 ÷ 1,000.
- 1,000 litres = 1 m³
- 10,000 litres = 10 m³
- 100 m³ = 100,000 litres
Why the wastewater volume can differ
Companies often assume a percentage of supplied water returns to the sewer, allowing for uses such as garden watering. The exact allowance varies, so use the tariff sheet for your company when checking a bill precisely.
Remember
This guide provides general information. Your supplier’s tariff, bill and support-team advice take precedence for your account.