At 7 AM on Tuesday morning, the banks of the Thames at Teddington are a hub of local activity. I joined members of the Teddington Bluetits for a swim in the River Thames.

Teddington Bluetits swim group getting into water
Source: Emma Conaghan

This stretch of the river between Ham and Kingston recently entered the final consultation stage for official Bathing Water Status, marking it as a priority site for water quality monitoring.

However, just up from where we entered the water, a different kind of project is being proposed. The Teddington River Abstraction (TDRA) scheme is a major infrastructure project designed to secure London’s water supply during droughts. But for those who use the river every day, the project raised significant questions about the future of this newly designated safe swimming spot.

The Proposed Water Substitution

The TDRA scheme is a water substitution project. During periods of drought, Thames Water proposes to abstract fresh water from the Thames and transfer it to a reservoir in East London. To maintain the river’s flow, ‘recycled’ water (effluent) that has been treated at the Mogden Sewage Treatment Works would be discharged back into the river at Teddington.

Diagram of Teddington Direct River Abstraction (TDRA) Works
Source: Thames Water

For Councillor Gareth Roberts, Leader of Richmond Council, the proposal represents a lack of coordination between government departments.

“On the one hand, we have a branch of government saying this is going to be a beautiful swimming place for the public,” Roberts stated. “The same department is considering a major industrial scheme which involves pumping treated effluent into the Thames nearby. It simply doesn’t add up to a joined-up policy.”

The Question of Cost and Efficiency

The project is currently under scrutiny from local campaign groups, including Save Our Lands And Rivers (SOLAR). Ian Mcnuff, a former Olympic Rower and SOLAR member, argues the project’s high cost does not match its limited use.

According to Mcnuff, who has reviewed the projects technical appendices, the total cost including finances, could reach approximately £2 billion. “You’re spending a significant sum on an asset that is designed to operate only during drought conditions- potentially six weeks a year on average,” he said.

Campaigners also point to Thames Waters’ own data regarding leaks. While the TDRA scheme would provide 75 million litres of water per day during a drought, campaigners highlight that the company loses an estimated 550 million litres every day through aging infrastructure.

Water Quality Standards

A primary concern for the Teddington Bluetits is the chemical composition of the recycled water. While Thames Water has committed to an additional stage of treatment, Cllr Roberts notes that current plans that current plans do not include specific requirements to filter for microplastics or forever chemicals.

“They are not obliged to remove these specific contaminants,” Robert explains. “While it may meet the Environment Agency’s current discharge standards, the question is whether it maintains the quality people expect at a designated bathing site.”

The physical footprint is also a factor. Local swimmers have raised concerns regarding the proposed 48-metre-wide structure on the riverbank, which they say would alter the semi-rural character of the area and potentially restrict river access.

A Decision for the Secretary of State

As the project is classified as a Nationally Significant Infrastructure Project, the final decision will not be made by local planners but by the Secretary of State.

Source: Teddington Bluetits

The Thames Water Position

Thames Water maintains that the TDRA project a “nationally significant” necessity to protect London’s water security.

In a statement the Thames Water spokesperson said “We welcome the news that Ham and Kingston could become London’s first bathing water site. We are supportive of all river users and are committed to playing our part in improving the local environment and River Thames.”

The company emphasised that the recycled water would undergo rigorous treatment and that “the project would meet environmental standards set by the Environment Agency.