Millbrook Wastewater Treatment Works Upgrade
Southampton · Ongoing (Final stage reached November 2023, completion expected soon after) [Water Magazine, Daily Echo] · £25m [Water Magazine, Daily Echo]
The judgement call
Account-gated at launchFocus on improving water quality in Southampton Water and protecting shellfish [Water Projects Online] - Investment in advanced treatment processes like UV to meet environmental standards [Daily Echo]
Key engineering challenges
Protecting and enhancing Southampton Water [Water Magazine] - Increasing stormwater storage capacity to reduce pollution incidents [Daily Echo] - Implementing new treatment processes like UV to improve water quality [Daily Echo] - Delivering upgrades on a live treatment site [LinkedIn (general challenge for Whitlingham, but applicable here)]
Project facts
- Client / owner
- Southern Water
- Lead contractor
- GTb (Galliford Try Environment and Binnies UK Ltd) [WaterHQ.world]
- Lead designers
- —
- Project type
- upgrade
- Scale
- Doubled stormwater storage capacity [Daily Echo]; Equipped with new ultraviolet treatment process [Daily Echo]
- Disciplines
- Civil; process; environmental; mechanical; electrical
- Standards & frameworks
- Environmental Agency regulations
Sources: Water Magazine: https://www.watermagazine.co.uk/2023/11/09/southern-water-enters-final-stage-of-major-25m-project-in-southampton/ (Accessed: 2026-06-10) - Daily Echo: https://www.dailyecho.co.uk/news/23879154.southern-water-nears-end-millbrook-sewage-works-upgrade/ (Accessed: 2026-06-10) - Water Projects Online: https://waterprojectsonline.com/case-studies/southampton-shellfish-scheme-2024/ (Accessed: 2026-06-10) - WaterHQ.world: https://waterhq.world/issue-sections/wastewater-treatment/wastewater-treatment/southampton-wastewater-treatment-works-upgrade-enhances-water-quality/ (Accessed: 2026-06-10)