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Water Management

Tesco – Invoice validation, cost and consumption reduction

Project Invoice validation, cost and consumption reduction project for Tesco Stores
Location Nationwide
Classification Water Management
Sector Retail


Waterscan won the Tesco invoice validation contract through a tender process more than 2 years ago after it was decided a specialist focus on water was required to maximise saving and refund opportunities. Having worked together since 2005 on surface water drainage, rainwater harvesting and leak detection/repair projects Waterscan had demonstrated their expertise and professionalism.


14,500+ – Invoices validated in last 12 months
500+ – Account investigations since April 2014
£500,000 – Circa annual reductions and recovered historic charges
250 – In excess of 250 sites audited for potential high consumption since Oct 2013
Over 50% – Average reduction per store, with 100+ stores returned to efficient operation
£1.5M – Over £1.5M saved in reduced annual consumption costs
29 – Underground supply leaks resolved saving over £1M per year
£775,000 – Recovered in historic consumption charges due to leakage

The project

The initial bill validation and analysis uncovered numerous instances of erroneous and duplicated charging that had not been previously identified. Waterscan’s rigorous process includes a detailed review of the water bills to ensure every charge is scrutinised: the process identified all cost efficiencies to ensure Tesco was paying as little as possible for the levels of use required to operate.

The next stage involved utilising Waterscan’s sector knowledge to accurately benchmark each store type, of which Tesco has many different formats, to identify potential consumption outliers. These outliers were surveyed; issues identified and resolved to return over-consuming sites to efficient operation. These stores had often been historically high users but this had not been previously identified. For example, one site was built with an underground leak and had consistently been one of Tesco’s highest annual consuming stores. After the leak was identified and repaired the store became one of the lowest users within its store-type category.


“Tesco has over 2,600 stores across the UK and water is essential to the good operation of our business. We recognise that our scale means that we have a responsibility to reduce our impact on the environment. Working with Waterscan has helped us to reduce our water consumption and achieve some excellent savings and refunds, which have exceeded our expectations.”

James Conlin
UK & RoI Buying Manager