The Business Water
Retail Market

How the Business Water Market Works

In England, the non-household water retail market opened to competition on 1 April 2017. For the first time, businesses, charities and public sector organisations could choose their water and wastewater retailer — separating the retail relationship from the network operator that owns and maintains the physical pipes.

The key distinction that most businesses miss: your network operator and your water retailer are two completely different things. Changing your retailer does not affect who maintains the pipes, responds to leaks or guarantees your water supply. That remains the responsibility of the licensed network operator in your area — United Utilities in the North West, Severn Trent in the Midlands, Thames Water in London and so on. You cannot change your network operator.

The market structure is managed by MOSL (Market Operator Services Limited), which operates the central market systems and data infrastructure that enable retailers to access customers across all network operator areas.

Who Can Participate?

The competitive retail market in England covers all non-household premises — businesses, charities, schools, hospitals, public sector organisations, farms and industrial sites. Residential customers and mixed-use premises with primarily residential use are not in scope.

The Active Retailers

Multiple retailers are licensed to serve non-household customers across England. The major active players are:

Wales — Why It's Different

If your organisation has sites in both England and Wales, you will have separate water retail relationships — a competitive retailer for your English sites and Welsh Water directly for your Welsh sites. This adds complexity to multi-site water contract management.

Switching — What It Actually Involves

Switching water retailer is significantly simpler than most businesses expect. The process is managed through the central MOSL market systems and does not involve any physical work on your water supply.

How to Tender Your Business Water Contract

For organisations consuming above approximately 5,000m³ per year — or with multiple sites — a formal tender process is strongly recommended over simply contacting retailers directly. The wholesale price is regulated and the same for all retailers, but retail margins, service charges and value-added services vary considerably.

What to Include in a Water Retail Tender

• Full SPID list — every supply point across all your sites with current consumption data
• Current retailer and contract end date — knowing your notice period is critical
• Annual consumption by site — in cubic metres, ideally 24 months of data
• Current unit rates and standing charges — gives a baseline for comparison
• Billing requirements — consolidated billing, frequency, data format, integration with finance systems
• Service level requirements — dedicated account manager, response times, leak alert notifications
• Water efficiency services — leak detection, smart metering, consumption analytics
• Contract term required — 1, 2 or 3 years; longer terms can attract better pricing

Contract Length and Pricing

Business water contracts typically run for 1–3 years. Unlike energy, prices are not usually fixed against commodity indices — the wholesale component is regulated by Ofwat and changes periodically, while the retail margin is set by the retailer. Some retailers offer price cap products or efficiency-linked pricing structures. Always clarify what happens to your price if wholesale charges change mid-contract.

Water Efficiency — What Retailers Offer vs What to Procure Separately

Water retailers have increasingly moved into water efficiency services as a commercial differentiator. Understanding what they offer — and where the limits of that offering are — matters for larger organisations.

What Retailers Typically Offer

• AMR (Automated Meter Reading) and smart meter data portals
• Leak alerts based on consumption pattern analysis
• Consumption benchmarking against sector peers
• Basic water audits for smaller premises
• Sustainability reporting and water footprint data

What to Procure Independently for Larger Estates

• Full water audits — independent consultants will identify leakage, inefficient processes and capital investment opportunities that a retailer's commercial interest limits them from recommending
• Smart metering installation — separate from AMR data services; the physical installation of meters with telemetry
• Leak detection surveys — specialist acoustic and correlator surveys for large estates
• Water recycling and reuse systems — greywater, rainwater harvesting and process water reuse are engineering projects requiring specialist procurement
• Wastewater discharge trade effluent consents — managed separately with the network operator, not the retailer

MOSL, Ofwat and the Regulatory Framework

MOSL (Market Operator Services Limited) is the company set up to operate the central systems and data infrastructure underpinning the competitive retail market in England. All retailers and network operators must be registered with MOSL and operate within its market codes. MOSL manages the switching process, meter point data, wholesale charging calculations and market compliance.

Ofwat regulates the wholesale charges that network operators can recover, ensuring the competitive retail market operates on a level playing field. Ofwat also licenses retailers — any company selling water services to non-household customers in England must hold an Ofwat retail licence.

WICS (Water Industry Commission for Scotland) performs the equivalent regulatory role in Scotland, overseeing the Scottish non-household market that opened in 2008.

Consumer Council for Water (CCW) is the independent statutory watchdog for water consumers in England and Wales, handling complaints that cannot be resolved directly with retailers and representing consumer interests in regulatory decisions.