Start with the meter readings
Compare the opening and closing readings on the bill with the number on your meter. If the bill says the reading is estimated, submit an actual reading and ask the company to recalculate it.
Remember that one cubic metre is 1,000 litres. A difference of 10 m³ means 10,000 litres, so even a small-looking meter change can be significant.
Check for a hidden leak
Turn off taps and water-using appliances, then note the meter reading. Wait at least 30 minutes without using water and read it again. Movement suggests water is still passing through the meter.
- Listen for a toilet cistern that keeps refilling.
- Look for damp patches, a hissing sound or an unusually green area outside.
- Check the boiler overflow and outside taps.
- Contact the supplier before arranging major excavation; leakage allowances may apply.
Look for changes at home
More occupants, working from home, a new lawn, a paddling pool or a power shower can materially change consumption. Compare the same period last year rather than the previous winter bill.
- Longer or more frequent showers
- Extra laundry or dishwasher loads
- Hosepipe and garden watering
- A new appliance or water softener
If the bill still looks wrong
Ask the company for a full breakdown of meter readings, dates, tariff rates and fixed charges. Keep photos of the meter. If you cannot resolve the issue, follow the company’s formal complaints process and then seek independent help from CCW.
This guide provides general information. Your supplier’s tariff, bill and support-team advice take precedence for your account.