Northumbrian Water is to invest £1 million to help improve water quality in the River Leven at Stokesley, in North Yorkshire.
Work is due to start in March at the company's wastewater treatment works (WTW) to the south of the town.
The upgrades will take up to three months to complete. Northumbrian Water’s partner, Esh-Stantec, will carry out the work.
All work will take place within the site's boundaries.
Northumbrian Water's Project Manager, Dean Thompson, said: "Our upgrades at Stokesley WTW will allow us to apply even higher standards to the treatment of the area's wastewater."
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