If your water bill jumps, check for a leak and ask about a credit

A water bill far above the usual is a shock, and it can feel like a bill you simply have to pay. A slow leak that you could not see or hear is one possible cause. Some people say that when a hidden leak was behind their bill, their water supplier gave them a credit for the extra water once they asked. This page is about that one situation: a bill that jumped, a leak that may be behind it, and the question to put to your supplier.

If your water bill jumps, check the meter for a leak, get any leak fixed, and ask your supplier at once whether it gives a credit for water lost to a leak, because some deadlines are 30 days or less.

Who this page is not for

If the water is included in your rent, or your landlord holds the account, the bill is not yours to dispute. Tell the landlord about the jump and the meter reading, and keep a copy of what you sent.

If you are in England or Wales and have no water meter, Ofwat says a metered bill depends on how much water you use, and describes the alternative as “a flat rate (usually based on the rateable value of your property).” A leak would not normally change a flat rate. In Scotland, Scottish Water says most homes are charged through the council tax bill and homes with a meter are billed by Scottish Water directly.

A jump is not always a leak. The Consumer Council for Water (CCW) lists other common reasons: more people than usual staying in your home, new appliances that use more water such as a power shower or garden sprinkler, a previous bill based on an estimate rather than a meter reading, and home renovations. If the last bill was an estimate, the new one can look high because it is based on a real reading. Ask the supplier for the dates and readings behind both bills.

Check for a leak

The US Environmental Protection Agency (EPA) says: “Check your water meter before and after a two-hour period when no water is being used.” It adds: “If the meter changes at all, you probably have a leak.” CCW gives the same steps in England and Wales: turn off all taps and appliances that use water, take a photo or write down the meter reading, wait a few hours and take another reading. CCW says: “If the second reading is higher than the first and you’re certain no water has been used, you may have a leak.” If you cannot do these checks, CCW says to contact your water company.

The EPA also says toilet leaks can be found by putting a few drops of food coloring in the toilet tank: “If any color shows up in the bowl after 10 minutes, you have a leak.” There is a page here called Find the silent leak with food coloring with the full steps.

If you find a leak, there is a page here called Find the water valve and replace the old hoses about locating the shut-off. A plumber can say where the leak is and what the repair involves.

Fix it, and keep the paper

The credit policies read for this page ask for proof that the leak existed and was repaired. Photograph the leak before it is fixed, keep every receipt or invoice, and write down the date you found it and the date it was repaired. Give true dates and real receipts.

Ask about a credit

In the US, the EPA’s leak pages do not mention credits, and there is no single national rule: each water utility sets its own policy, and the two city policies read for this page are very different.

• Edina, Minnesota offers a one-time adjustment to a residential customer after a fixture leak or pipe break. It says the quarter’s use must be 100% more than the property’s four-year average for that quarter, permanent repairs must be made within 60 days of the bill’s due date, the request must be sent within 90 days of the due date, and the account must be current. It limits the credit to $500 for one quarterly bill, and it charges the gallons over the four-year average at the Tier 1 rate.
• Aledo, Texas says an adjustment is not guaranteed. It says leak adjustments may be made for sewer charges for certain documented and repaired customer-side leaks, that they are “not intended to credit a customer for water consumption,” and that the request must be in writing within 30 days of the bill’s issue date. It says toilet leaks and other leaks that discharge into the sewer system are not generally adjusted, and that one leak adjustment in 12 months is the usual limit. Separately, it lists a courtesy adjustment, once in the life of a residential account and for a single billing period, where the account has at least 12 months of billing history and use is more than 50% higher than the same billing period a year before, asked for in writing within 30 days after the end of the billing period. Its page does not say whether that adjustment covers water, sewer or both.

So the useful questions are: does the utility have a leak policy, what kind of leak does it cover, what is the deadline and from which date, what proof does it want, and does the credit cover water, sewer, or both. Ask for the policy in writing. 211 can point to local help if the bill is more than you can pay.

In England and Wales, Ofwat says: “If your metered bill is higher than usual, it could mean a leak on the underground supply pipe into your property.” It says water companies are “required by their licences to reimburse the cost of water lost though leakage by way of credits to your water bill,” which it calls a leakage allowance, and which “can apply to water supply charges and to wastewater charges.” It says: “You can only claim this allowance once the leak has been repaired,” and that a company can refuse an allowance “in some circumstances, for example if you have not arranged for the repair of the leak within any reasonable timeframe specified by the company, or where the leak was caused by your own negligence.” It also says each company must clearly explain how it deals with leakage from household supply pipes, including how to claim an allowance, how it is applied and when it can be refused. Ofwat’s page is about the supply pipe; whether a company also credits a leak inside the home, such as a running toilet, is that company’s own policy. Conditions still differ between companies. One English company, United Utilities, says a metered customer can claim for a leak on internal or external pipework if it is the first claim at the property and the leak was repaired within 30 days of discovery. It asks for a meter reading once the repair is done and another 14 days later, and it says no allowance is given for leaks the customer knew about without acting promptly or for negligence. CCW (0300 034 2222 for England, 0300 034 3333 for Wales) and Citizens Advice (England 0800 144 8848; Wales 0800 702 2020) can help if you are stuck.

In Scotland, this page did not read Scottish Water’s rules for homes with a meter. If you have a meter, ask Scottish Water what it does for a leak, and Citizens Advice Scotland (0800 028 1456) can advise if you are stuck.

In Northern Ireland, NI Water said in March 2026 that “due to the continuing deferment of domestic charges,” eligible metered customers keep a domestic allowance on their bill. This page did not read its leak rules. If you have a bill you do not understand, ask NI Water, and the Consumer Council for Northern Ireland (0800 121 6022) or Advice NI (0800 915 4604) can advise.

Next time

Some people say that a cheap battery alarm placed under a sink or by a washing machine, where a leak is likely to start, gives an early warning. Some people say that a water bill has a fixed part that does not fall however little you use, so cutting water use hard saves less than expected; there is a page here called Catch the cold water while the shower warms up that looks at that. A meter reading taken on the same day each month would show a rise before the bill arrives.

Whether the extra water is credited is the supplier’s decision, and asking early is the part in your hands.