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Compare NowBusiness Water for Warehouses
The water bill for a warehouse is rarely the biggest line item, but it is one of the few that can be improved without operational change.
You can switch retailer. Warehouses have had that right in England since 2017. Most never have.
This page covers where warehouse water costs come from, how to switch retailer, and where overpayment usually hides.
- 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 warehouses across England and Scotland.
- Wholesale supply still comes from regional water companies (Thames Water, Severn Trent, Yorkshire Water, and others).
- Warehouses can contract directly with retailers, and multi-site operators can contract centrally for portfolio pricing.
- Typical warehouse water spend varies widely by site type and size.
- The three biggest savings levers: surface water drainage rebates, meter validation, and tariff reviews.
Why warehouses pay more for water than they should
A warehouse has a small operational water footprint — staff facilities, occasional washdown, sprinkler testing — but a huge physical footprint. That mismatch creates the single biggest overpayment we see in the sector: surface water drainage charged on building area regardless of whether the rainwater that lands there ever reaches the public sewer. On a 50,000 sq ft unit with attenuation ponds or soakaways, the historic rebate runs into five figures.
Sprinkler testing is the second underrated cost. Quarterly or annual fire-system tests run thousands of litres through the meter. Most retailers bill that as standard consumption — but it’s testable, predictable, and worth either sub-metering or applying for a fire-system allowance.
The five places warehouses overpay
| Where warehouses overpay | Why it matters |
|---|---|
| Surface water drainage on full roof footprint | You’re charged for every square metre of roof regardless of where the gutters actually discharge. Most modern warehouses route rainwater to attenuation ponds or soakaways — fully rebatable. |
| Sprinkler test water billed as live consumption | Annual or quarterly sprinkler tests are predictable, measurable and largely returnable to the storm system. Most retailers bill them at full rate by default. |
| Unmetered sites on rateable-value pricing | Older warehouses without water meters pay a rateable-value charge that often exceeds metered usage by 30–60%. A meter install pays back inside 18 months. |
| Yard washdown and dust suppression at peak rate | Loading-bay washdown and external dust control add up. Worth sub-metering the external tap to apply a different drainage assumption. |
| Vacant unit standing charges | Standing charges run on every meter regardless of occupancy. Vacant or part-let units accumulate fees the asset manager rarely flags to the retailer in time. |
Can warehouses and logistics operators switch water supplier?
The 12 retailers below are all licensed by Ofwat to supply non-household water. Pricing, service and sector experience vary — most operators shortlist three and run a comparison.
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.
Warehouse water FAQs
My warehouse barely uses any water — why is the bill so high?
Almost always surface drainage. The retailer charges for every square metre of roof and hardstanding regardless of where rainwater actually goes. Modern warehouses with attenuation ponds or soakaways are usually owed a substantial refund.
How does sprinkler-system testing get billed?
Default: at full retail rate, the same as a leaking tap. With a sprinkler-system allowance application or a sub-meter on the test point, that water can be either zero-rated or routed to a different rate.
Should I install a meter if my warehouse is unmetered?
Yes, almost always. Rateable-value charging assumes worst-case usage and almost always overstates actual consumption. Meter install is free in most areas and pays back inside 18 months.
I’m a 3PL operating across 12 sites — can we contract once?
Yes. Multi-site logistics contracts are standard. One contract, one renewal date, one invoice cycle. Most retailers will discount the standing charge component for portfolios.
What about vacant or partly-let units in my estate?
Standing charges keep accruing on every meter until you formally notify the retailer of vacancy. Worth a quarterly review of your portfolio to flag voids and stop the meter.
How much does a typical warehouse save?
A small distribution unit typically saves £400-£900 a year on the supply contract. A midsize logistics warehouse saves £900-£1,500. A multi-site 3PL saves £2,000-£5,000 a year — and that’s before the historic surface drainage refund, which can dwarf the annual saving.
How do I start an audit?
Send the latest 12 months of water invoices and a Google Maps link to the site. We assess drainage from satellite imagery first, request a site walk-around if it looks like there’s a refund, and quote the open market in parallel.
