South East reservoir
South East Strategic Reservoir Option (SESRO) – a new reservoir proposed by Thames Water in Oxfordshire. This will be the water source for the Thames to Southern Transfer Project.
We're planning to build a new water supply works and a new pipeline capable of transferring 120-million litres of water per day to help keep Hampshire’s taps and rivers flowing. In the longer term, the project will be capable of providing water to almost one million people.
According to the Environment Agency, the South East needs to find an extra 2.5 billion litres of water a day by 2050 to maintain supplies. That’s why we’re investing in new sources of water, such as the Thames to Southern Transfer project that will allow us to move water from a new reservoir in Oxfordshire and transfer it to our supply in Hampshire, where it’s needed.
It’s one of a number of projects that will help secure future water supplies and reduce our reliance on Hampshire’s rare and delicate chalk stream rivers - the Test and Itchen - helping to protect these vital habitats, especially during droughts when river levels are low.
We plan to build a new water supply works to treat the water taken from a planned new reservoir in Oxfordshire before being transferred to our supply network. This will be built on land to the west of the A34 near Drayton, next to the new reservoir at the point where water is taken.
The reservoir, known as the South East Strategic Reservoir Option (SESRO) is being developed by Thames Water, with contributions from Southern Water and Affinity Water. It’s expected to be complete by 2040 and will be capable of holding 150 billion litres of water.
Following treatment at the water supply works, water would then be pumped through up to 85km of new pipeline to several connections in Hampshire. Connections will also be provided to Thames Water at Newbury and South East Water at Basingstoke.
Over the next several years, we will be running detailed investigations and assessment to find the best route for the new pipeline. We’ll also be speaking to the local community in detail about our plans and running a formal consultation.
We are working with Thames Water and South East Water on these proposals and this page may change as the options are developed further.
South East Strategic Reservoir Option (SESRO) – a new reservoir proposed by Thames Water in Oxfordshire. This will be the water source for the Thames to Southern Transfer Project.
A new water supply works will be located on land next to the new reservoir. It will treat the water from the reservoir to drinking water standards before being sent into supply.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to Thames Water’s Kennet Valley water resource zone.
A new connection and pipeline to our Kingsclere water resource zone.
A new connection and pipeline to our Andover water resource zone.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to South East Water’s water resource zone at Basingstoke.
A new connection to our Winchester (North) water resource zone.
A new connection to our Winchester (South) water resource zone.
South East Strategic Reservoir Option (SESRO) – a new reservoir proposed by Thames Water in Oxfordshire. This will be the water source for the Thames to Southern Transfer Project.
A new water supply works will be located on land next to the new reservoir. It will treat the water from the reservoir to drinking water standards before being sent into supply.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to Thames Water’s Kennet Valley water resource zone.
A new connection and pipeline to our Kingsclere water resource zone.
A new connection and pipeline to our Andover water resource zone.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to South East Water’s water resource zone at Basingstoke.
A new connection to our Winchester (North) water resource zone.
A new connection to our Winchester (South) water resource zone.
Here's a timeline of what we've done so far and how we plan to complete the project by 2040.
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