United Utilities News Article
Date: 27.10.2025
United Utilities has successfully installed Europe’s largest valve at its Bromborough Wastewater Treatment Works to protect homes and businesses from the risk of tidal flooding.
Marking a major milestone for the area, the installation prevents tidal backflow from entering the system during high tides. This not only protects vital coastal infrastructure and helps improve water quality in the River Mersey but also reduces odours at the outfall.
Developed by Swedish-based water technology company Wapro, the custom-built valve was installed within the existing 2.4-metre-diameter storm outfall pipe at Bromborough using a slip-lining method.
The valve was lifted into place using cranes and precisely guided into position. The slip-lining technique allowed the valve to be inserted without the need for new pipework or major civil works, reducing installation time and environmental impact.
Its design ensures that stormwater flows freely out while preventing tidal water from entering the system—safeguarding the treatment works and surrounding assets.
This strategic investment aligns with United Utilities’ broader mission to deliver £13bn worth of investment across the North West over the next five years to 2030, championing environmentally friendly infrastructure that protects communities and ecosystems across the region.
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