Tetra Tech Selected to Lead Groundwater Monitoring for Next Phase of the Thames Tideway Tunnel Project
Tetra Tech, a global leader in high-end consulting and engineering services focused on water, the environment, and sustainable infrastructure, today announced that Tideway has selected the company to deliver comprehensive groundwater monitoring services for the next operational phase of the Thames Tideway Tunnel, one of the United Kingdom’s most ambitious and transformative environmental infrastructure projects. The project aims to safeguard the tidal River Thames and drastically reduce the volume of untreated sewage entering the waterway.
Under the new £2.5 million contract, Tetra Tech will provide advanced groundwater and environmental monitoring solutions to support the tunnel’s ongoing operations and environmental management. The company’s work will ensure that groundwater quality, chemical composition, and hydrological behaviors are continuously assessed to protect both public health and the long-term sustainability of London’s ecosystem.
A Landmark Project in UK Environmental Infrastructure
The Thames Tideway Tunnel—often referred to as London’s “super sewer”—is a 25-kilometer (16-mile) tunnel running beneath the River Thames. Designed to intercept, store, and convey millions of tonnes of untreated sewage and stormwater that would otherwise discharge into the river, the tunnel represents a historic upgrade to London’s 150-year-old combined sewer system. Once fully operational, it is expected to reduce sewage overflow pollution by more than 95%, creating a cleaner, healthier, and more resilient river environment for generations to come.
The project forms a central part of the UK government’s strategy to modernize critical water infrastructure, meet environmental protection regulations, and enhance the overall quality of urban waterways. The Tideway initiative also supports long-term sustainability goals by improving flood resilience and contributing to climate adaptation efforts in one of Europe’s most densely populated cities.
Tetra Tech’s Role and Technical Capabilities
Tetra Tech’s groundwater engineering experts will play a key role in monitoring and managing the complex subsurface conditions associated with the Thames Tideway Tunnel. Using the company’s Tetra Tech Delta software platforms, engineers and environmental scientists will capture, process, and analyze a wide range of physical, chemical, and biological data from groundwater systems along the tunnel’s route. These insights will be delivered in real time to the client, enabling data-driven decision-making and proactive environmental management.
The monitoring framework will include both manual and automated systems for tracking groundwater levels, flow dynamics, and contaminant concentrations. In addition, Tetra Tech’s teams will provide interpretive analysis and long-term trend assessments to ensure compliance with environmental standards and regulatory requirements.
By integrating digital monitoring technologies with its scientific and engineering expertise, Tetra Tech will help ensure that the Thames Tideway Tunnel continues to operate safely and sustainably, minimizing environmental impacts throughout its lifecycle.
Commitment to Sustainability and Science-Based Solutions
Tetra Tech is proud to contribute to this landmark infrastructure project that is transforming London’s water environment,” said Dan Batrack, Tetra Tech Chairman and CEO. “The Thames Tideway Tunnel is a significant national initiative addressing the long-standing challenge of combined sewage spills into the tidal reaches of the River Thames. Through our Leading with Science® approach and nearly 60 years of cutting-edge technical expertise, we are honored to design and deliver critical services that protect public health, support sustainable water management, and preserve one of London’s greatest natural assets.”
Batrack emphasized that the company’s role in this project underscores its commitment to applying science-based, data-informed solutions to address the world’s most pressing environmental and infrastructure challenges. He added that Tetra Tech’s global experience in hydrogeology, data analytics, and digital transformation positions it uniquely to deliver high-value outcomes for clients like Tideway.
A Partnership for the Future
Tideway’s selection of Tetra Tech highlights the company’s reputation for excellence in environmental engineering and its proven track record of delivering innovative water management solutions worldwide. From major urban water networks in the United States to river restoration projects in Europe and Asia, Tetra Tech has consistently demonstrated the ability to balance technical precision with environmental stewardship.
As the Thames Tideway Tunnel moves into its operational phase, Tetra Tech’s contribution will help ensure that groundwater systems remain stable, protected, and well understood. This work will be crucial for maintaining the long-term integrity of the tunnel structure and the surrounding environment.
About Tetra Tech
Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end consulting and engineering services for projects worldwide. With 30,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science® to address the entire water cycle, protect and restore the environment, and design sustainable and resilient infrastructure. For more information about Tetra Tech,
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