A water bill can be higher than usual for several reasons, and a hidden leak is only one of them. More people at home, new appliances, a change of charges or a bill based on an estimated reading can all push the figure up, so it is worth ruling these out before assuming water is escaping.
If the simple explanations do not fit, a few checks can help show whether a leak might be to blame.
Check the Bill Itself First
Look at the dates the bill covers and compare them with your previous bill. A longer billing period will naturally cost more. Check whether the bill used an actual meter reading or an estimate, as an estimate can be higher or lower than what you really used.
Charges can also change. If you are unsure about any part of your bill, your water company can explain how it was worked out.
If you have recently moved in, the first bill may also include an opening reading that was taken late or estimated. Keep a dated photo of your meter whenever you move, so you have something to compare against.
Think About Changes at Home
Small changes in daily life add up. Someone working from home, a new baby, guests staying, a hot spell when the garden needed watering or a new bath that holds more water can all raise use without anything being wrong.
Dripping taps and toilets that keep running are worth checking too. Thames Water suggests fixing dripping taps and leaky loos, as these can waste water over time without being obvious.
Outside taps, garden hoses and water butts with a mains top-up can be easy to forget as well. Walk around the outside of your home and make sure nothing has been left running or dripping.
Signs a Hidden Leak Could Be Involved
If nothing at home has changed, look for other clues. A water meter that moves when no water is being used is one of the strongest signs. Others include the sound of running water in a wall or floor, lower pressure than normal, or a patch of ground outside that stays wet in dry weather.
None of these signs proves a leak by itself. A rise in your bill alongside two or three of these clues makes it much more worth looking into.
What You Can Do Next
Take a meter reading before bed and again in the morning, without using any water overnight. Keep a note of the readings and any other signs you have spotted. If you share a supply with neighbours, contact your water company before drawing any conclusions.
If your notes suggest water is going somewhere it should not, our leak detection in Oxford can help find out whether a leak is behind the higher bill. Once you know the cause, you can ask your water company whether any help with the bill is available.