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Thursday, 16 October 2025 05:30

Southern Water completes major £7.5m wastewater upgrades

Southern Water has completed major upgrades at two wastewater treatment works in Surrey and West Sussex.

SOUTHERN WATER Forest Green WWTW

The improvements at the sites in Forest Green and Slinfold are helping remove more phosphorous and other tiny contaminants from flows – ensuring the water that leaves the works is cleaner than ever before.

At Slinfold, £4 million has been spent on:

  • Installing new equipment that safely adds small amounts of chemicals to remove phosphorus
  • Creating a new filtration plant to catch more phosphorus and other tiny contaminants
  • Increasing the capacity of the treatment works so it can treat more flows at peak times and after heavy rainfall – making storm overflows much less likely.

 

Forest Green’s £3.5 million has been invested in:

  • Adding new technology that better measures and monitors both incoming and outgoing flows
  • Utilising safe chemical dosing to aid phosphorous reduction
  • Increasing capacity, thanks to two new large septic tanks and two new final settlement tanks.

 

The work was carried out by GTb on behalf of Southern Water - Michael O’Rouke-Jones is Senior Project Manager for GTb commented:

“We’re really pleased to have completed these two projects. The teams worked hard to meet the deadlines, and we would like to thank local residents for their patience while we carried out this essential work.”

Robin Woodward, Project Manager for Southern Water, added:

“This is another important step in improving the health of our local rivers and streams. It’s part of our wider commitment to raising water quality across the region.”

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