United Utilities is investing more than £50 million in upgrades for its wastewater treatment works in Carlisle – the improvements will benefit the River Eden and shellfish in the Solway Firth.

The water company is spending more than £50 million that will help boost water quality in the River Eden and protect shellfish in the Solway Firth by reducing the number of times storm overflows operate during periods of heavy rainfall.
The project will increase capacity and enhance the performance at the works to treat greater volumes of storm sewage. New tertiary and storm water treatment processes, and a 3,500 cubic metre storm water storage tank have been built. The storm tank will hold three and a half million litres of water.
Alongside improving the health of the river for the local community, new technology has also been installed that will improve the quality of the final effluent and storm water that is returned to the environment from the treatment works.
Pippa Smith, Wastewater Asset Manager at United Utilities, said:
“It’s fantastic to see that work on this really important project is nearly complete. These improvements will make a real difference to the water quality on this stretch of the River Eden as well as helping to protect the shellfish in the Solway Firth – providing a better environment for everyone to enjoy.“
“Here at United Utilities we are committed to working alongside communities to create improved river health for all. In fact, our Better Rivers; Better North West campaign has seen us commit to reducing the number of spills from storm overflows by at least a third, between 2020 and 2025.”
The Advance-plus JV of MWH Treatment , J Murphy & Sons and Stantec UK acted as principal contractor and designer to the scheme. The project is part of United Utilities’ wider commitment to improving 184km of waterways and coastal waters across the region over the next two years.
United Utilities’ Better Rivers; Better North West initiative is supported through a £230 million investment programme at sites across the region.
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Hear how United Utilities is accelerating its investment to reduce spills from storm overflows across the Northwest.