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Competitive PricesWhat drives the price
A UK business water bill is built from five distinct rate components, each set independently and combined on your bill:
- Volumetric water charge — pence per cubic metre, applied to your metered consumption. Set by your wholesaler.
- Standing charge — fixed daily charge that pays for the meter and connection. Set by your wholesaler.
- Sewerage charge — volumetric, typically billed on an assumption that 95% of incoming water becomes wastewater. Set by your wholesaler.
- Surface water drainage charge — based on chargeable area at your premises. Set by your wholesaler.
- Retail margin — the only competitive component. Set by your retailer.
Sites with trade effluent get a sixth component priced via the Mogden formula. Sites with non-standard sewerage arrangements may have variants on (3) above.
Wholesale components in detail
Each regional wholesaler publishes an annual “Schedule of Charges” effective from 1 April each year. The schedule lists every rate for that financial year. Here’s how each piece is constructed.
Volumetric water charge. Calculated from the wholesaler’s cost of producing and treating clean water — abstraction, treatment, pumping, distribution losses, capital amortisation on the network — divided across the total cubic metres they expect to sell. Larger sites generally get lower per-cubic-metre rates via banded tariffs (a typical structure might charge 95 to 130p/m³ for the first 100,000m³ and step down for higher volumes).
Standing charge. A fixed daily charge tied to the meter size (15mm, 20mm, 25mm, 40mm, etc.). Pays for meter reading, account maintenance, and the share of network costs that don’t scale with consumption. Ranges from 50p/day for the smallest meters up to several pounds per day for industrial-sized connections.
Sewerage charge. Volumetric, typically priced 70 to 110p per cubic metre of returned wastewater. Default assumption is that 95% of your incoming water returns as sewage. Sites with significant non-sewered uses (irrigation, evaporation, water in product) can apply for a “non-sewered allowance” or “trade effluent allowance” to reduce this percentage.
Surface water drainage charge. Based on the chargeable hard area at your premises — typically calculated from OS map data or site surveys — multiplied by a regional rate per square metre. Bandings vary by wholesaler. Sites can claim rebates if they prove they don’t drain to the public sewer.
Retail margin
The retail margin is what the retailer adds on top of wholesale charges to cover billing, customer service, account management, debt risk, and their own profit. Typically 5 to 15% of the total bill on a standard site, sometimes less on very large accounts where retailers compete more aggressively.
What’s actually inside the margin depends on the retailer’s service tier and any extras they bundle in:
- Basic retailers price tightly on margin, do the bare minimum on service, leave you to manage your own bills.
- Mid-tier retailers include online dashboards, automated meter reading where possible, consumption reporting, occasional account reviews.
- Premium retailers offer dedicated account management, water efficiency consultancy, leak monitoring, sustainability reporting. Their margins are higher but cover more value-add for businesses that need it.
For most SMEs, the basic-to-mid tier is usually the right fit. For larger accounts (£25k+/year water spend), the account management value can outweigh the higher margin.
Why rates change every April
Ofwat sets each wholesaler’s allowed revenue requirement five years at a time — the “Price Review” process. The current price control (AMP8) covers 2025-2030. Within each five-year window, the wholesaler updates its schedule of charges every April to reflect:
- Inflation adjustments (typically CPIH-linked, with some retail price index legacy)
- The agreed phasing of the five-year revenue requirement
- Any pass-throughs for changes in environmental obligations, energy costs, or capital programme delivery
April 2026 saw notable wholesale price rises across most English wholesalers as the AMP8 programme kicked off — many regions saw 8 to 15% increases on combined water and sewerage charges. The retail margin portion typically doesn’t move with the April update; retailer competition keeps it relatively stable year-on-year.
Ofwat price controls explained
Ofwat reviews and re-sets the price control every five years. The current cycle:
| Price control | Period | Notes |
|---|---|---|
| AMP6 | 2015-2020 | Heavy focus on efficiency and resilience |
| AMP7 | 2020-2025 | First post-deregulation cycle; broadly held real-term prices flat |
| AMP8 | 2025-2030 | Significant capital programme uplift for storm overflows, leakage reduction, and net zero commitments — material wholesale price rises |
| AMP9 | 2030-2035 (planned) | Currently in early consultation |
Within each AMP window, the wholesaler’s revenue is regulated but the year-on-year phasing of the rises is at the wholesaler’s discretion (within Ofwat’s overall envelope). That’s why April rates can step up significantly in years 1 and 2 of a new price control and stabilise in years 4 and 5.
What is actually negotiable
Three things you can move:
1. Retail margin. Switch retailer. Saves the competitive portion of the bill. Typical 5 to 15% reduction on the retail portion, which is 5 to 15% of the total bill — so 0.5 to 2.5% off the headline. Meaningful at scale but rarely transformative.
2. Rebate-eligible items. Surface water drainage rebate, sewerage return adjustment, trade effluent volume re-percentaging, and leakage allowance claims. These can be much larger than the retail saving — sometimes 5 to 20% off the total bill — and they apply against wholesale charges that retailers can’t otherwise compete on.
3. Volumetric tariff bandings. If your consumption straddles a tariff band threshold, sometimes restructuring metering or aggregating accounts can move you into a lower band.
Three things you can’t move:
- The wholesale volumetric rate (no broker can negotiate this)
- The annual April price update
- The wholesaler itself (it’s geographic)
Typical rates by business size
Indicative ranges only — actual rates depend heavily on your region, meter size, and consumption profile.
| Business profile | Annual consumption | Typical annual water bill |
|---|---|---|
| Small office (10 staff) | 50-150 m³ | £300 to £900 |
| Small retail / café | 100-300 m³ | £500 to £1,500 |
| Pub or restaurant | 500-2,000 m³ | £2,500 to £10,000 |
| Small hotel (under 50 rooms) | 2,000-8,000 m³ | £8,000 to £30,000 |
| Light manufacturing | 5,000-30,000 m³ | £20,000 to £120,000 |
| Food production / brewery | 30,000+ m³ | £100,000+ (often with significant trade effluent on top) |
Indicative ranges only. These are not quotes. Add surface water drainage, trade effluent, and retail margin where applicable.
Working with Clearsight
We price every quote with the wholesale and retail components shown separately, so you can see exactly what’s regulated and what’s competitive. We also run the rebate-eligibility check (surface drainage, leakage, trade effluent) as part of the standard audit. No upfront fees.
Get a no-obligation business water quote in 60 seconds.
Related guides: Business water pillar, Wholesale vs retail market, How to read a business water bill, Trade effluent explained, SPID number explained.