My bill went up. Did the standing charge go up too?

It may have, but not because of the leak. Standing charges are reset annually along with the volumetric rates, so a bill can rise for both reasons at once. The leak accounts for the volumetric part of the increase and nothing else.

What is a standing charge actually for?

The fixed costs of being connected: maintaining the pipe network, meter reading, billing and customer service. Those costs do not fall when you use less water, which is the argument for charging them separately from volume.

Does including it make much difference to a leak cost?

It makes the leak look worse than it is, and by a fixed amount rather than a proportional one, so the smaller the leak the bigger the distortion. At a genuinely small loss the standing charge could be most of the figure, and none of it would be caused by the leak.

Is there a standing charge on the sewerage part as well?

Usually yes. Water and sewerage are typically billed with their own fixed charges and their own volumetric rates, so there can be two fixed charges on one bill. Neither of them moves with volume, so neither belongs in the cost of a leak.

Standing charges

A standing charge does not change when you have a leak. It is a fixed annual amount, billed whether you use 0 cubic metres or 300, so no volume of water moves it. Only the volumetric charge, the part billed per cubic metre, responds to a leak, and it is the only part of the bill the calculators on this site apply.

Last reviewed 14 August 2026. Rates correct as of 14 August 2026

The short answer

A UK metered water bill has two kinds of charge on it, and only one of them is about how much water you used.

Charge	What it depends on	Moves with a leak?
Standing charge	Nothing you do. A fixed annual amount for being connected.	No
Volumetric charge	The volume you are billed for, per cubic metre.	Yes. This is the entire cost of a leak.

The two kinds of charge

This is the most common way a leak cost gets inflated, including by calculators that multiply a whole bill by a factor rather than working from the volumetric rate.

How this works in practice

Because the standing charge is fixed, the arithmetic separates cleanly and the leak is entirely in one term.

Bill without a leak: standing charge, plus your normal volume multiplied by the volumetric rate.
Bill with a leak: the same standing charge, plus your normal volume plus the leaked volume, multiplied by the same volumetric rate.
The difference between those two is the leaked volume multiplied by the volumetric rate. The standing charge cancels, because it appears identically in both.

That is the whole reason the calculators on this site never ask for your standing charge. It cannot affect the answer, so asking for it would be asking for a number that does nothing.

The volumetric rate is the number that matters, and how UK water is priced covers where to find yours. The part of the bill a leak genuinely does change is the volumetric charge, and on the sewerage side the part of the bill a leak does change explains how much of the volume your company actually bills for.

What changes the answer

Three things, and none of them makes a standing charge part of the cost of a leak.

Annual price changes. Standing charges are reset each year, so a bill can rise because of a price increase and a leak at the same time. Those are two separate causes and only one of them is yours to fix.
Having two fixed charges. Water and sewerage are usually billed with their own standing charges, so the fixed part of a bill can be larger than people expect. It is still fixed.
Being unmetered. An unmetered household has no volumetric charge at all, so nothing on the bill responds to volume, and a leak changes it by nothing.

The smaller the leak, the more a wrongly included standing charge distorts the answer, because it is a flat addition to a small number rather than a proportional one.

Assumptions and sources

Litres in a cubic metre

Exact by definition

SI definition. The litre is defined as one cubic decimetre, so one cubic metre is exactly 1,000 litres.

Nothing on this page rests on a constant. That a fixed charge does not vary with volume is definitional rather than measured, and the arithmetic that follows from it is subtraction.

Standing charge amounts themselves vary by company and by year, and none has been verified on this site yet. That does not affect anything here, because the amount is irrelevant to the cost of a leak whatever it turns out to be.

What to do next

Two things, and both are on your bill rather than on this site.

Find the volumetric rate per cubic metre, separately from the standing charge. On most UK bills they are listed as separate lines, and it is the per cubic metre figure the calculators need.
If you are comparing this year's bill with last year's to estimate a leak, compare the volumes rather than the totals. Two years of totals differ by the price change as well as by the leak, and the volumes differ only by the water.

Common questions

My bill went up. Did the standing charge go up too?: It may have, but not because of the leak. Standing charges are reset annually along with the volumetric rates, so a bill can rise for both reasons at once. The leak accounts for the volumetric part of the increase and nothing else.
What is a standing charge actually for?: The fixed costs of being connected: maintaining the pipe network, meter reading, billing and customer service. Those costs do not fall when you use less water, which is the argument for charging them separately from volume.
Does including it make much difference to a leak cost?: It makes the leak look worse than it is, and by a fixed amount rather than a proportional one, so the smaller the leak the bigger the distortion. At a genuinely small loss the standing charge could be most of the figure, and none of it would be caused by the leak.
Is there a standing charge on the sewerage part as well?: Usually yes. Water and sewerage are typically billed with their own fixed charges and their own volumetric rates, so there can be two fixed charges on one bill. Neither of them moves with volume, so neither belongs in the cost of a leak.