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Monday, 06 July 2026 13:31

AECOM appointed as design partner to support £340 million upgrade of Thames Water Oxford STW

AECOM has today announced that it has been appointed by Murphy as its design partner to deliver Thames Water’s major upgrade of the Oxford Sewage Treatment Works in the UK.

OXFORD SEWAGE TREATMENT WORKS AERIAL VIEW

Commenting on the appointment, David Mayfield, Senior Project Manager at Thames Water said:

“This upgrade to Oxford Sewage Treatment Works represents a significant investment in the long-term resilience and environmental performance of our wastewater network.

“By working closely with AECOM and our delivery partner Murphy, we’re ensuring that Oxfordshire’s growing communities benefit from an upgraded, future-ready treatment facility that safeguards our waterways, enhances capacity and provide a resilient wastewater service, with fewer storm overflows for years to come.”

With AECOM appointed as the contractor’s exclusive design partner for multidisciplinary design services, the upgrade will increase treatment capacity by circa 40% while supporting population growth and protect the environment by further improving effluent quality that goes into the River Thames at the end of the sewage treatment cycle.

The upgrade is a key part of Thames Water’s capital deliver works program during AMP8, the UK’s current Asset Management Period 8 (AMP8). The circa £340 million scheme also includes upgrading power supplies and increasing storm tank capacity and sewage treatment flows.

Dr. Beverley Stinson, chief executive of AECOM’s global Water business said:

“Upgrading these major sewage treatment works is critical for facilitating growth and protecting the environment for communities in Oxfordshire.

“AECOM is the world’s number one water design firm, and we are proud to bring our global technical excellence to support Thames Water provide a significant increase in treatment capacity. Key to success is harnessing our world-leading technology and AI solutions to deliver more efficient, resilient, and sustainable infrastructure for the future.”

“AECOM continues to strengthen its position in the UK water market, and we look forward to helping deliver cleaner waterways for communities in Oxfordshire and beyond,

Richard Whitehead, chief executive of AECOM’s Europe and India region added:

“Building on our proud legacy as a trusted partner to the industry, this award reinforces our longstanding relationship with Thames Water. By continuing our successful collaboration with Murphy, we are bringing together the best skills and expertise to help Thames Water enhance its services for customers.”

AECOM previously delivered Thames Water’s Deephams Sewage Treatment Works upgrade in a joint venture with Murphy and Kier, which is one of London’s largest wastewater treatment plants. US-headquartered global infrastructure provider AECOM said this latest win follows its appointment to key AMP8 UK water infrastructure frameworks, including supporting Thames Water’s circa $540 million professional services framework and Southern Water’s $4.8 billion capital delivery program.

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