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Our leakage performance


Reducing our leakage is one of our most important priorities, and also one of our biggest challenges.

In this report, we talk about our leakage performance for February 2021 and outline the challenges we’ve faced due to the colder than average weather during the early part of the year, including the 'freeze-thaw' in mid-February. We know we need to get to a position where we’re not affected by weather shocks, and we’re implementing a plan to transform the way we run our water network to improve our resilience and operational performance. We’re also laying the groundwork for a longer term, ground-breaking new project to replumb London and parts of the Thames Valley, so we can provide a water service that is fit for the future.

In the meantime, we’re taking lots of steps to reduce our leakage, including increasing the number of repair gangs available to fix leaks, improving the way we talk to our customers about how they can protect their own pipes and innovating to create a smarter network. As part of that we’ve just launched some brand-new artificial intelligence software, which provides a new virtual model of our network, using data from smart meters and acoustic loggers, to help pinpoint problem areas.

Full information about how we’re tackling leakage can be found below.

An illustration of a Thames Water engineer holding a spanner in front of a Thames Water van.

Headlines for February 2021 (published March 2021)

  • The colder than average weather in February had an impact on leakage levels: Monthly leakage for February was 732 Ml/d, which is 94 Ml/d above our internal target. The increase in leakage was driven by colder than average weather and the 'freeze-thaw', causing an increase in the number of visible leaks, which exceeded our forecast levels, as well as some significantly larger than average bursts, which had an impact on our planned ‘find and fix’ work for the month.
  • Covid-19 restrictions also continue to affect our year-to-date performance: Our annual average leakage after February is 18 Ml/d above our internal target for the April 2020 to February 2021 period.
  • We fixed more leaks in February compared to January: We completed 4,568 leak repairs in February, the equivalent of 1,142 leaks on average each week – 4% more leaks each week than we did in January. We prevented the equivalent of 28 Ml/d of leakage through leak repairs.

The information provided is, to the best of our knowledge, accurate, but may be subject to change from time to time. The information does not represent formal annual regulatory reporting.

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