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Mall water bills almost always carry an apportionment error. Around 30% of common-parts apportionments still run on the formula that was set when the lease was first drafted. Tenants come and go. The food-court tenant mix changes. The customer WCs get reduced from twelve cubicles to eight. The original apportionment doesn’t move. Five years on, nobody on either side is paying the right share, and the wholesaler is happily billing whatever number was last keyed in.
You can switch retailer. Retail units and shopping centres have had that right in England since 2017. Most never have.
This page covers the bits of a retail water bill that hide the most overcharge: common-parts apportionment, food-court trade effluent banding, customer-WC standing charges and the surface drainage on the loading bay. If you own the asset rather than manage the centre, the landlords page covers the broader multi-tenant asset angle.
- England’s non-household water market opened to competition on 1 April 2017 under the Water Act 2014.
- Around 20 retailers are licensed by Ofwat to supply retail units, food-court operators and shopping-centre management.
- Wholesale supply still comes from regional water companies (Thames Water, Severn Trent, Yorkshire Water, and others).
- Roughly 30% of common-parts bills carry an apportionment error that has never been re-calculated against actual tenant mix.
- Food-court trade effluent is the single most miscoded line on a mall bill — most courts under-load Mogden but get billed in a higher banding by default.
- The three biggest savings levers: re-running common-parts apportionment against current tenants, challenging trade-effluent banding with a Mogden-formula recalculation, and validating surface drainage on loading bays and service yards.
Why shopping centres pay more for water than they should
A busy retail unit cycles water through food-court kitchens, dishwashers, ice makers and back-of-house prep at a far higher rate per square metre than most commercial sites. That alone is fine — what isn’t fine is paying daily standing charges on a tariff that hasn’t been touched since the contract was signed, drainage charges on a forecourt that drains to a soakaway, and meter estimates that have been creeping up for two years.
Retail units and shopping centres also tend to sit on tenanted commercial leases — the landlord is often named on the bill, but the operator is the one bleeding money. The retailer doesn’t volunteer corrections, and most retail unit owners haven’t been told the market is competitive.
The five places shopping centres overpay
| What’s going wrong | Why it costs you money |
|---|---|
| Common-parts apportionment formula stuck at the original lease | Most malls apportion common-parts water by leased area at the time of the original lease — but tenants change every few years. The formula rarely gets re-papered, and the bigger anchors usually subsidise the smaller units. |
| Food-court trade effluent banding too high | Food-court Mogden coefficients are typically set on commissioning at the conservative end. Most food courts under-load the consent in practice. A resampling exercise usually drops the band one or two notches. |
| Customer-WC standing charges per cubicle | If the cubicle count was reduced in the last refurb, the standing charge often wasn’t. Each removed cubicle is worth a small but real reduction once the wholesaler is notified. |
| Cooling-tower makeup on full retail margin | Plant rooms with cooling towers (typical for centre-managed HVAC) pay full retail clean rates on water that evaporates rather than drains. A deduct meter pays back inside a year. |
| Surface drainage charged on the whole loading bay | Service-yard surface area defaults to public sewer assumption. A drainage audit against the actual interceptor and soakaway layout usually rebates 20–40% of the bay’s drainage charge. |
Can shopping centres and independent operators switch water supplier?
Yes, and the mechanism is different depending on who’s signing the contract.
An retail unit is its own legal entity, so it can enter a water contract directly — no council approval needed. Multi-academy trusts can contract centrally for every retail unit in the chain, which usually unlocks better volume pricing. Independent operators sign for their own site, with the contract in the trading entity’s name.
The 12 retailers below are all licensed by Ofwat to supply non-household water in England. Pricing, service, and hospitality-sector experience vary — most trusts shortlist three and go to a simple comparison exercise.
Routes to procurement
Three ways operators in this sector typically bring a new water contract in. Each comes with its own trade-off between control, effort and how sharp the price lands.
British Property Federation and Revo (formerly BCSC) members can call off pre-tendered shopping-centre water contracts that aggregate volume across multiple centres. The unit rate is usually competitive, and admin is one invoice across the portfolio. The trade-off: framework deals don’t include the common-parts apportionment audit or the food-court Mogden recalculation, which is where most malls find the bigger numbers.
Retail unit water FAQs
How is common-parts water apportioned to tenants?
Usually by floor area, sometimes by rateable value, occasionally by a bespoke schedule written into the original lease. The formula is fine on day one. The problem is that tenants change use over time — a clothing unit becomes a coffee shop, a bank becomes a phone shop — and the original apportionment was never re-cut for the new load profile.
Our food court has a trade-effluent consent. Can we challenge the banding?
Yes. The Mogden formula prices effluent on volume, biological oxygen demand (BOD), chemical oxygen demand (COD) and suspended solids. Wholesalers default to a conservative banding. A sample taken across a typical trading week, run through a UKAS-accredited lab, often shows the actual loading is below band. The retailer can then re-apply on your behalf.
What about the customer WCs — we reduced cubicle count last refurb?
Tell the retailer. Standing charges are levied per supply point and per cubicle on some legacy schedules. If the cubicle count came down at refurb but the standing-charge schedule didn’t, you’ve been over-paying since the works completed. The credit can be backdated up to six years.
How does mall service-charge water actually flow through?
The centre pays the bulk water bill. That cost is recovered from tenants through the service-charge budget, usually under a utilities or common-parts heading. Tenants will scrutinise the line, especially the larger anchor tenants with their own facilities team. Getting the apportionment defensible up-front prevents the service-charge dispute later.
What’s the difference between the retail page and the landlords page?
The landlords page covers asset-level multi-tenant questions: vacant unit billing, sub-meter accuracy, surface drainage on car parks. This page covers mall and centre operations: common-parts apportionment, food-court trade effluent and customer-WC standing charges. Different decisions, different reader.
What does a free audit actually look at?
Three things at the same time. We compare the unit rate against the live market across all 12 retailers. We audit surface drainage, trade effluent and standing charges for historic billing errors that can be backdated up to six years. And we check whether the contract structure fits your actual usage profile better than the default. If we don’t recover anything, you don’t pay a fee.
How do I get a quote without committing?
Send a recent water bill. The SPID, annual cubic-metre volume and current retailer are all on it. We come back within two working days with a like-for-like alternative quote and a flag if anything looks worth auditing for historic refunds.
