Southern Water Trials Fibre Optic Technology for Leak Detection

Innovative Leak Detection Technology

Southern Water is embarking on a significant trial in Hampshire, leveraging cutting-edge fibre optic technology to enhance its leak detection capabilities. The Lightsonic system, which employs Distributed Acoustic Sensing (DAS) combined with machine learning, aims to identify leaks more quickly and effectively than traditional methods. This initiative is part of Southern Water's ongoing efforts to improve drought resilience and lessen reliance on local water sources, such as the River Test.

Tackling Water Loss

Currently, Southern Water supplies an average of 566 million litres of drinking water daily, but it suffers a staggering loss of 91 million litres each day due to leaks. The company has made strides in reducing leakage over the past three years, achieving an 18% reduction last year alone. The new technology aims to nearly double the leak repair rate, aligning with Ofwat's target of a 32% reduction by 2030.

• Leakage Reduction Goals: Southern Water aims to significantly enhance its leak repair rate to meet regulatory targets.
• Current Leak Statistics: Approximately 90% of leaks are undetectable from the surface, making efficient detection crucial.

Previous Success and Future Aspirations

The trial in Hampshire follows a successful pilot in the water industry that prevented the loss of over four million litres of water per day across a 650km network. Previous collaborations with Affinity Water and Openreach have also yielded positive results, identifying over 100 leaks and saving around two million litres daily. Lightsonic's technology is now reported to save more than four million litres per day across the UK, highlighting its potential impact on water conservation efforts.

Drought Conditions and Water Management

As of August 2026, 71.3% of England was experiencing drought conditions, with reservoir storage levels at just 56.9% in early September. These challenging circumstances have led to temporary use bans affecting around 30 million people, underscoring the urgency for effective water management and leak detection.

Collaboration with Openreach

Southern Water's trial is part of a broader initiative involving Openreach, the UK's largest fibre network operator. Openreach is conducting trials with various water companies and technology partners to enhance leak detection capabilities. The collaboration with Lightsonic represents a significant step forward in utilising fibre optic technology to address the pressing issue of water leakage, which costs the UK around £750 million annually in unplanned engineering work for repairs.

Conclusion

The introduction of fibre optic technology for leak detection marks a pivotal moment for Southern Water as it seeks to combat water loss and improve service efficiency. With the ongoing challenges of drought and water scarcity, innovative solutions like the Lightsonic system will play a crucial role in securing the future of water supply in the region.