Work is well underway on our multi-million redevelopment of the treatment works which started in September 2014.
Picture above is an artist's impression of the completed redevelopment
The existing site was built in 1966 and was in need of modernisation. The redevelopment project once completed will:
- Reduce smells coming from the site
- Ensure the treated wastewater leaving the site meets new, higher environmental standards
- Ensure the redesigned works fits in with the ongoing redevelopment of the area.
The end result will be a modern wastewater treatment works that will serve the area long into the future. Our film below gives a 3D virtual tour of how the works will appear from the street or estuary when construction is complete.
More than half of the temporary treatment works have now been demolished and we will continue to be phased out as we progress the construction of the permanent site.
The redevelopment will significantly reduce the smells coming from the site and residents should start to see improvements as the redevelopment progresses.
While we are still using parts of the original and temporary processes, and during warmer or particularly wet weather, we’ll continue to experience some odour issues from the site, due in part to accumulation and breakdown of fats, oils, and grease (also known as FOG) in the flows arriving for treatment.
As the new site will be completed in stages we need to ensure we are able to continue cleaning your wastewater and there will be occasions where we need to do undertake activities that are normally not required. These activities could cause additional smells, but should only be temporary. We’ll also be cleaning the old tanks before they’re demolished and you may notice some additional smells during this time.
The new site will see the open air tanks, where the majority of the smells originate from, replaced with new treatment processes fully odour controlled and contained within the building.
We’ll do everything we can to keep smells to minimum during construction.
An Employment and Skills plan is in place which will encourage the participation of local contractors, sub-contractors and suppliers and provide employment opportunities for Southampton residents.
We’ll be keeping residents updated on progress and plan to hold regular drop-in sessions with the project team at the Community Liaison Group meeting. The project is being carried out by contractor 4Delivery.
Community Liaison Group
As agreed with local community groups and Southampton City Council, we have created a Community Liaison Group. The aim of the group is to create a link between Southern Water, 4D and the local community. Regular meetings allow us to receive feedback from the community and provide progress updates.
The group meets every three months at the site offices and includes representatives from all parties involved.
Members of the project team will also be on hand to answer questions and discuss the ongoing activities. The chair for the group is Councillor Warwick Payne.
For anyone interested in attending or finding out more information, please call our site office number (during office hours) on 02380 420856.
For all other enquiries please see our contact us page.
Frequently asked questions
Work is under way on our redevelopment and modernisation of Woolston Wastewater Treatment Works.
We started work in September 2014 and expect the construction process to take about five years to complete. 4Delivery (4D), a consortium comprising Veolia Water, Costain and Stantec, is carrying out the work on behalf of Southern Water.
The project is being carried out in stages to make sure we can continue to treat the wastewater for the local area while the redevelopment is being done, and because of the very small area of the site which we can work in.
We built a temporary treatment works which took over much of the treatment from the existing works during the main construction phases. This enabled us to start work on the existing site by demolishing some tanks and structures.
In January 2018, as part of bringing the plant into service, we ‘turned flows’ and started to pass wastewater through new treatment processes. The means you may hear new noises coming from site – don’t worry, we are also monitoring this.