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Wednesday, 10 December 2025 08:22

Southern Water completes £4.5 million upgrade at Calbourne WwTW on Isle of Wight

Southern Water has completed a £4.5 million upgrade at its Calbourne Wastewater Treatment Works on the Isle of Wight – boosting the health of the local environment.

SOUTHERN WATER Calbourne WWTW upgrade

The work will significantly improve the quality of treated water which enters the Caul Bourne stream.

The upgrade at Calbourne includes the installation of a new ferric dosing system, a new tank, and the refurbishment of the site’s reedbeds—natural filtration systems that help further clean wastewater before it is returned to the environment.

The improvements are part of the water company’s wider commitment to improving environmental performance and protecting the Island’s precious water environment.

Taniko Aston-Kolek, Project Manager for Southern Water, said:

"This project is a great example of how targeted investment can deliver real environmental benefits. By upgrading our treatment processes at Calbourne, we’re helping to protect the Caul Bourne and contribute to cleaner seas around the Isle of Wight—supporting our goal of improving water quality across the region."

Martin Richards, Project Manager for GTb, added:

"It’s great to see this project finished. We’d like to thank the residents of Calbourne for their patience while we undertook this work."

The work follows from other projects on the Isle of Wight to improve bathing water quality with £21 million recently being invested and a further £99 million being invested in this area.

One of the major projects Southern Water is expected to complete is £17 million worth of improvement works at Sandown Wastewater Treatment Works by the end of the year.

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