Understanding your business water bill: what you are actually paying for
Business water bills are quietly complicated. Where a domestic bill covers one property doing predictable things, a business bill can include five or six distinct services — several of which have nothing to do with the water coming out of your taps. Understanding the lines on the bill is the first step to spotting the errors that creep into them, and business water bills contain errors more often than most owners would guess.
The two halves: water and wastewater
Almost every business water bill splits into:
- Water supply charges — the clean water delivered to your premises, usually a volumetric charge per cubic metre based on your meter readings, plus a fixed standing charge.
- Wastewater (sewerage) charges — taking used water away and treating it. Since most premises have no wastewater meter, this is typically charged as a percentage of metered water in, on the assumption that most water supplied ends up as sewage.
That "water in equals sewage out" assumption is your first place to look for savings. If your business uses significant water that never reaches the drain — irrigation, water in your product, evaporation from cooling — you may be entitled to a non-return-to-sewer allowance reducing your sewerage charge. Businesses that qualify often have not claimed it.
Surface water and highways drainage
Two lines that surprise people:
- Surface water drainage — the cost of draining rain from your roofs and car parks into public sewers. It is commonly banded by site area, so a warehouse with a large roof can pay substantial surface water charges while using very little tap water. If your rainwater does not drain to the public sewer — soakaways, private watercourse drainage — you can apply for a reduction or removal of this charge. Wrong banding and unclaimed exemptions here are among the most common business water billing errors.
- Highways drainage — a contribution to draining public roads, usually a smaller fixed element.
Standing charges and meter size
The fixed standing charge often scales with the size of your water meter, not your usage. Premises are sometimes fitted with a larger meter than the business actually needs — a legacy of a previous occupier or an over-specified installation. Where a smaller meter is technically appropriate, a meter downsize can reduce the fixed charge permanently. It is an unglamorous saving that keeps paying every year.
Trade effluent: a bill within the bill
If your business discharges anything other than ordinary domestic-strength sewage — food processing washdown, commercial kitchen output at scale, laundry water, process water — that is trade effluent, and it is measured, consented and charged separately. The strength and volume of the discharge drive the charge. Our separate guide on trade effluent covers this in detail; the point for bill-reading purposes is that trade effluent lines deserve their own scrutiny, because both the measured volumes and the assumed strengths can be challenged with evidence.
Unmetered premises: charges by rateable value
Not every business premises has a water meter. Where there is none, charges are usually based on the property's rateable value — a historic valuation figure that has nothing to do with how much water you actually use. For a low-usage business in a highly rated property, that can mean paying for far more water than ever comes out of the taps. It is generally possible to request a meter, and where a meter genuinely cannot be fitted, retailers can offer assessed charges instead. If your bill shows no meter readings at all, working out whether metered charging would suit you is one of the first questions worth asking — it is a structural change to the bill, not a haggle.
Reading the bill like an auditor
Five checks worth making on your next bill:
- Actual vs estimated reads. A run of estimates ending in a large catch-up bill is a sign your retailer is not reading the meter. Submit your own reads and photos.
- The right meter. Check the meter serial number on the bill against the physical meter. Crossed meters — where you are billed on a neighbour's meter — genuinely happen, especially on parades and industrial estates.
- Surface water banding. Is the site area band plausible for your premises? Do you actually drain to the public sewer?
- Sewerage percentage. Does the return-to-sewer assumption fit how your business uses water?
- Vacant or duplicated supplies. Multi-site businesses regularly discover they are paying for supplies at premises they left years ago.
Getting the bill checked professionally
A water bill review costs you nothing: our specialists check the charges, the market data behind them and the allowances you may be missing, alongside comparing retailers in the open England and Scotland market. If a switch or a correction is worthwhile we handle it, and the retailer pays our commission — never you. Start with the quote form on our homepage, and a UK-based specialist will call you back.
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