Knitsley Sewage Treatment Works

As part of the Water Industry National Environmental Programme (WINEP), we will be installing chemical dosing plant (ferric sulphate and sodium hydroxide) and a new tertiary treatment stage to enable the site to meet the forthcoming phosphorous discharge consent. The improvement works will cost around £4m, and it’s one of 27 sites within the NWG region to receive this upgrade. Phosphorous is a nutrient and can cause algae to grow in watercourses, reducing biodiversity and river water quality.

Project updates

Update by Jane Cooper


We are now fully up and running with work progressing well on the project.  

We have recently taken delivery of the tertiary treatment plant which has now been installed and work around this area continues. 

Part of the inlet works has been demolished to make way for the chemical dosing kiosk bases and their ancillary equipment, with the works remaining fully operational during all these construction activities.


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Update by Jane Cooper


Site is now well established and civil works are underway. The old washwater building at the North end of site has had some conservation work carried out on it to ensure that the bats that were present were rehomed successfully.

This building has now been demolished to make way for the new one currently being built off-site. Work is also underway at the South end of site to install a pumping station for the  new Tertiary plant.

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Update by Jane Cooper


I’d like to introduce the team from Galliford Try that will be completing the work at Knitsley on behalf of Northumbria Water. My name is Jane Cooper, and I am the Customer Experience Coordinator for Galliford Try. Our Site Manager is Michael Mattimoe and our Project Manager is Mark Goodby

We will be keeping you updated with progress on this portal, but if you have any questions, you can either quickly create an account to comment on any activity updates on this page, or alternatively, use the ‘Contact’ button at the top of the page, whichever way is best for you.

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Update by Charles Harman

I would like to take this opportunity to introduce you to our team and project.

I am Charles Harman, the Northumbrian Water Project Manager, and I will be looking after this project through to its completion. The project will be delivered by Northumbrian Water’s delivery partner Galliford Try. 

Starting from mid-February 2024 we will be carrying out construction works at Knitsley sewage treatment works to add additional treatment processes to further improve the water quality of the Smallhope Burn, a tributary of the River Browney. The works should all be completed by March 2025. 

As the project develops I will keep you informed about our plans and progress by sharing our proposals with you on this portal. I am very interested to understand your views. 

The team will post regular updates throughout the construction phase of the project, and if you have any queries or want to make us aware of any additional assistance you require from us then please use the ‘Contact us’ button at the top of this page or post on this feed.

If you prefer a telephone conversation or require any further information or advice, please contact our Customer Centre on 0345 717 1100 or visit to request a call back from the project team.

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