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Business water is the utility most companies never look at. It is usually a small line on the ledger, it arrives quarterly, and nobody questions it. That is exactly why it is so often wrong.
Here is how your water bill is actually built, and the honest truth about where savings come from.
We tender your supply across our selected supplier panel
These are the retailers on our selected supplier panel. We compare them on total cost including standing charges, not headline margin.
What Makes Up a Business Water Bill
Four separate charges, and most businesses only ever look at the total.Water Supply
A volumetric charge for every cubic metre you use, plus a standing charge based on your meter size. Measured at your meter, identified by its SPID.
Wastewater and Sewerage
What goes down the drain. Usually assumed to be a percentage of what you take in, which is an assumption worth challenging if your site loses water to process or evaporation.
Surface Water Drainage
Charged on rainwater running off your site into the sewer. Billed on your site area. If your rainwater does not actually reach the public sewer you may be paying for a service you do not receive, and rebates can be backdated.
Trade Effluent
If you discharge anything other than domestic-strength waste you need a consent, and you are charged on strength and volume. Frequently mis-assessed.
Why Switching Water Saves So Little
The honest answer nobody selling you a switch will give you.Since the non-household market opened in April 2017 you can buy water from any licensed retailer in England. Scotland opened in 2008. But here is what that actually means:
> The wholesaler still owns everything. Your regional wholesaler still treats the water, owns the pipes and the meter, and sets the wholesale charge. That charge is the same whoever bills you.
> Only the retail margin is competitive. The retailer buys at the wholesale price and adds a margin for billing, metering and service. That margin is the only part on the table.
> So the saving is thin. Typically a few percent, not the double-digit swings you see in gas and electricity.
Anyone promising to transform your water costs by switching retailer is overselling. We will not.
What a Real Water Quote Looks Like
A genuine renewal quote we ran in July 2026, anonymised. One meter, around 2,300 cubic metres a year.This is why we keep telling you the switch is not where the money is. Below is a real quote for the same meter: our transparent offer next to the business’s current supplier.
| 2026/27 | Wholesale (£/yr) | Retail charge (£/yr) | Total (£/yr) |
|---|---|---|---|
| Our offer (transparent) | 9,666 | 466 (shown) | 10,132 |
| Current supplier | 9,666 | hidden in marked-up unit rates | 10,514 |
Anonymised renewal quote, July 2026. A single meter using approximately 2,300 cubic metres of water and wastewater a year. Figures rounded to the nearest pound.
Look at what is identical and what is not. The wholesale charge is exactly the same, 9,666 pounds, because the same regional wholesaler treats and delivers the water whoever bills you. The wholesaler even states it on the quote: these are the rates every retailer buys at, regardless of size, with no mark-up.
So the entire difference between the two columns is the retail charge. Our offer shows it plainly at 466 pounds. The current supplier does not show it at all, they bury the margin inside inflated unit rates (2.75 pounds per cubic metre against our 2.55). Switching this meter saves 382 pounds, about 3.6%. Worth having, but a few percent, exactly as we said, and a fraction of what a bill audit can recover.
Where the Real Money Actually Is
Not in the rate. In whether the bill is right at all.Water bills are wrong far more often than energy bills, because nobody checks them. The errors we find repeatedly:
> Billing for the wrong site. Charges landing on your account for a unit you do not occupy. We have found and corrected exactly this.
> Surface water drainage you do not use. If your rainwater does not discharge to the public sewer, you should not be paying for it. Rebates can be backdated.
> Estimated reads that compound. Quarters of estimates, then a large correction nobody can explain.
> Leaks you are paying for. Water lost underground is still billed to you, and often billed as wastewater too.
> Wrong meter, wrong size, wrong SPID. Standing charges set against a meter that is not yours or is oversized for the site.
> Trade effluent mis-assessed. Charged on a strength assumption rather than your actual discharge.
A retrospective audit can look back several years. On a multi-site estate that is routinely worth more than any switch, and it is money you have already spent.
What Is a Good Business Water Rate?
Less useful a question than it sounds, because most of your bill is not negotiable. Your wholesale charges are set by your regional wholesaler and published. The retail margin is small. So a good rate is worth having, but it is not where your money goes.
The better question is whether every charge on the bill is one you should be paying at all. That is what an audit answers, and it is where we find the money. See our business water services or compare business water. If you are moving in or out of a site, our change of tenancy guide explains the reads and notifications that keep you off deemed water rates.
Business Water Rates FAQs
How much does business water cost per cubic metre?
It varies by region, because your wholesale charges are set by your regional wholesaler and published annually. Two identical businesses in different parts of the country pay different rates for the same water. The retail margin on top is small by comparison.
Why is my business water bill so high?
The common causes are a leak, estimated reads that have compounded, surface water drainage charged when your rainwater does not reach the public sewer, wastewater assessed as a percentage of intake when your site does not return that much, or charges for a site you do not occupy. All are worth checking before you assume the rate is the problem.
How much can I save by switching water supplier?
Usually a few percent. Your wholesaler sets most of the bill and that does not change when you switch retailer, so only the retail margin is competitive. Anyone promising large savings from switching alone is overselling.
What is a SPID?
A Supply Point ID, the unique reference for your water supply point. It is water’s equivalent of an MPRN for gas or an MPAN for electricity, and you need it to get an accurate quote or to query a bill.
Can I claim back water charges I have already paid?
Often yes. A retrospective audit can look back several years, and surface water drainage rebates in particular can be backdated where the charge was never applicable. This is money you have already spent, which is why it is usually worth more than a switch.
What is surface water drainage?
A charge for rainwater running off your site into the public sewer, billed on your site area. If your rainwater soaks away or discharges to a watercourse instead, you may be paying for a service you do not receive.
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