The upgrade covers more than half of the company’s 170,000 metered business customers across London, the Thames Valley and surrounding areas.
They provide near real-time data to help businesses spot leaks, monitor usage and reduce unnecessary water consumption.
Mark Cooper, head of smart metering at Thames Water, said: “Reaching the milestone of more than 90,000 smart meters installed across our metered business customer base is a significant achievement.
“Smart meters give businesses access to better information about how they use water, helping them identify issues earlier and make informed decisions about their consumption.
“The insight we’re gaining is also helping us better understand non-household demand across our region, identify opportunities to save water and support our plans to secure resilient water supplies for the future.
“Following the hottest summer on record, it is important we all play our part to protect vital water resources.
“By combining smarter data with practical support and incentives for businesses, these new initiatives can help reduce waste and protect those resources when they are needed most.”
Around 2,000 smart meters each month are being installed by Thames Water, and it is currently targeting approximately 27,500 to be installed throughout 2026.
The meters are being fitted at a wide range of sites, including small businesses, schools and large industrial users.
Thames Water said the technology is already making a difference, with the percentage of smart-metered businesses showing continuous water flow – an indicator of leaks – dropping from 34 per cent to 28 per cent.
Also, the company has written to thousands of businesses where smart meter data suggests potential leaks or other issues.
In August alone, more than 2,100 letters were sent to customers highlighting continuous water flow that may warrant investigation.
Alongside the smart meter rollout, Thames Water is also launching three new demand reduction initiatives for business customers.
These include a Smart Water Saver scheme, which will reward eligible businesses with bill credits where they reduce water use by at least 10 per cent compared to the same period last year.
Thames Water, working with water retailers, is reaching out to business customers with the biggest continuous flow to directly identify and fix the customers’ leaks and other wastage.
The company is also temporarily turning off the water supply to confirmed vacant business premises.
Together, these measures are expected to save around 16 million litres of water each day.
Thames Water said the largest saving is expected from tackling continuous flow at business premises.
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