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News Centre > Monday 14 March 2022

Guernsey Water undertakes significant refurbishment of St Saviour's Water Treatment Works

Dam Wall at St Saviours Reservoir

Guernsey Water is currently undertaking a £3million refurbishment of St Saviour's Water Treatment Works. The long-term project will run in phases over the next couple of years and will see a switch from membrane filtration to rapid gravity filtration treatment process.

The current membrane filtration water treatment process at St Saviour's Water Treatment Works is coming to the end of its life. The utility has taken the opportunity to review water treatment technology and consider which process provides excellent water quality at the most affordable whole life cost, with the lowest environmental impact.

St Saviour's Water Treatment works will be refurbished in phases using a rapid gravity filtration water treatment process and ultraviolet (UV) disinfection system. This is a very similar treatment that was recently installed at our Juas Treatment Works which has proven to operate more efficiently; at lower costs, using less chemicals.

Carl Falla, Capital Delivery Manager, Guernsey Water said: "Our phased approach to the refurbishment will mean that while parts of the site are worked on, others can still be online to meet our customers demand for quality drinking water. Our primary aim is to achieve a balance between maintaining output and allowing the complex improvement works to progress efficiently.''

"We want to reassure Islanders that while this is a major technical project for Guernsey Water, the quality or availability of water supplies will not be affected whilst works are carried out. This complex project is being managed and carried out by our staff in nearly all areas."

Once complete St Saviour's Water Treatment Works will be capable of production on average 10ML/d (10 Megalitres or 10 million litres per day) of drinking water for our customers. The works is one of three on the island.

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