The partnership has a five-year contract to design, build and commission a new plant in the city,
This will replace the existing 60 year old site which is slated to be demolished to allow Guildford Borough Council to develop new housing.
As part of the program, the council has agreed to fund the new processing works that will be built on the Slyfield Industrial Estate.
The £ 80 million work is set to allow future expansion to meet the demands of Guildford’s growing population.
Francis Paonessa, Capital Delivery Director of Thames Water, said: “This will be the first new sewage treatment plant built by Thames Water since Reading STW opened more than 15 years ago and shows our commitment to the service we offer Offer customers to continuously improve. “
The project includes the construction of a 1.5km long tunnel, 1,500mm in diameter, to carry wastewater from the existing Guildford sewer system to the new site, and facilities to carry out the four stages of treatment to meet environmental requirements before the Treated water is returned to the Wey River via a newly created outlet.
With the construction work from autumn 2022, the complete detailed planning of the work will begin immediately.
The completion of the new sewage treatment plant is planned for the beginning of 2026.