My bills have increased. Have I got a leak? The increase may be due to a leak, but there are other potential reasons to consider first. Read through the below - could any of these have affected your bill? General usage - Has the nature of your business changed? Has the number of people using the water increased? Reading type - Whilst we aim to take actual meter readings wherever possible, on occasion it may be necessary for us to use estimated readings. Have any of your last two bills been estimated? If your last reading was estimated, can you provide an actual reading? If so, let us know.Bill period - Does your most recent bill cover a longer period than your previous bill? Most properties are billed every six months but the exact period of days covered will vary.Appliances/fittings - Appliances like new dishwashers and power showers may use more water. Any dripping taps or faulty toilet cisterns may also cause high water usage, even if they have since been fixed. If you have been through the above and still cannot account for the increase in usage, your next step is to check for leaks. How to undertake the stop tap test.