People matter: together we have a voice
The Reservoir needs planning permission to go ahead. Thames water does not have this permission yet.
Thames Water is preparing to apply for planning permission for the White Horse Reservoir, in November 2026. Because the proposed Reservoir is a major national infrastructure project, it bypasses local planning, and Thames Water must apply to the Planning Inspectorate for a Development Consent Order (DCO).
To find out more about the planning process and the Development Consent order, please click the link below:
What you can do
Register with the Planning Inspectorate to receive updates on the DCO.
Donate to GARD’s Crowdfunder
Help fund expert advice for the reservoir planning enquiry.
Working together, we can help to ensure the best solution for the long-term water supply of our local area and the wider South East.

What is the proposed reservoir?
Find out more about Thames Water’s proposed reservoir which would be situated between Steventon, Drayton, Marcham, East Hanney and Abingdon.

Why does GARD oppose the reservoir?
The proposed reservoir is a solution in search of a problem. Find out more about the reasons GARD opposes the reservoir.

What are GARD’s alternatives?
Read more about GARD’s safe and environmentally sustainable alternatives to the proposed reservoir.
Latest News…
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Oxfordshire County Council calls for delay to the DCO submission
Oxfordshire County Council has formally raised serious concerns about Thames Water’s Targeted Consultation on construction access points for the White Horse Reservoir. In its submission, OCC states that the consultation fails to meet three of the four Gunning Principles (the key principles that ensure transparency and fairness in public consultations in the UK), meaning that…
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Crowdfunder reaches £5k in its first week
Help keep it going… Raising funds for legal expertise and to continue GARD’s awareness-raising campaign efforts Thanks to everyone who has helped so far with their donations. We are most grateful to you. Please help us keep it going by sharing the link with friends, family, neighbours, colleagues, your wider networks, and anyone you know…
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Significant traffic increases: MPs and local councillor respond to Targeted Consultation
Local MPs, Olly Glover, Layla Moran and Charlie Maynard, and Local Councillor, Sarah James, Hendreds Ward, Vale of White Horse District Council, have responded to Thames Water’s latest updated plans for the reservoir, which include a massive increase in access points to the proposed site. GARD estimates that the total road vehicles for the construction…
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GARD calls for targeted consultations as Thames Water’s reservoir consultation deemed inadequate
GARD today issued a strong call for Thames Water to conduct targeted consultations on the proposed reservoir, following our detailed review of the statutory consultation process. Our analysis reveals significant inadequacies in the information provided to the public, raising serious concerns about the transparency, safety, and environmental impact of the project. This follows similar views…
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Summer 26 update
GARD has continued to be busy with the campaign to raise awareness about the proposed Reservoir and oppose its development. Below is the latest update on progress with the campaign. The proposed Reservoir does not have planning permission; Thames Water will not put in its application for a Development Consent Order until November 2026 at…
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GARD calls on regulators to protect the public
In a major submission to the regulators, Ofwat and RAPID, on their draft Gate 3 decision on the South East Strategic Reservoir Option (SESRO), GARD warns that the proposed Reservoir now represents a serious failure of governance, transparency and public protection. GARD’s submission to Ofwat/RAPID on the SESRO Gate 3 draft decision (available here) shows…
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