Thames Water's Abingdon Reservoir Plan: What You Need to Know (2026)

Imagine the challenge of ensuring a steady water supply for millions, and then throw in a technical hiccup that complicates public feedback. That's precisely what happened with the proposed reservoir project near Abingdon, Oxfordshire. Thames Water, the utility company behind this ambitious plan, has extended the timeline for public comments, giving residents more opportunity to voice their thoughts after an online form malfunction restricted some responses.

The South East Strategic Reservoir Option, which is set to be constructed near Abingdon, is not just a small-scale initiative; it aims to collect water from the River Thames during the winter months, when the river is abundant, and provide essential resources to around 15 million individuals across London and the South East. The reservoir itself would be approximately the same size as Gatwick Airport and could cost up to £7.5 billion.

Due to the recent technical issues with their online consultation form, Thames Water announced that they will now accept detailed email submissions until January 23rd. This statutory public consultation began on October 28 and was initially scheduled to end on January 13, but the extension allows more community input, which is vital for such a large-scale project.

The water collected in this reservoir will not only support local households but also businesses, including customers served by Affinity Water and Southern Water. During periods of high demand or when river levels are low, water will be released back into the Thames to maintain balance downstream.

What’s interesting is that the costs associated with this new infrastructure will ultimately be passed on to customers through their water bills. Thames Water emphasizes that the reservoir is essential in addressing future water shortages that are anticipated due to increasing population and changing climate conditions.

Looking ahead, Thames Water plans to apply for planning approval from the government in the fall of 2026, with construction slated to commence in 2032. Their goal is to have the reservoir operational by 2040 and fully completed by 2043.

So, what do you think about this reservoir proposal? Is it a necessary step toward ensuring water security, or could there be better solutions? We'd love to hear your thoughts!

Thames Water's Abingdon Reservoir Plan: What You Need to Know (2026)
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