An MP met a boss of Thames Water for assurances that work to upgrade treatment works discharging millions of litres of untreated sewage into waterways is on track.
It comes as a criminal investigation is being carried out into sewage dumping into Witney's rivers.
The Environment Agency is investigating Thames Water over allegedly releasing “significant” levels of pollution which affected Colwell Brook and Queen Emma’s Dyke, which flow into the River Windrush in Witney.
Witney and West Oxfordshire MP, Robert Courts said he was "reassured that work on upgrading Witney Sewage Works is progressing" when he met chief financial officer of Thames Water, Alistair Cochran, at Standlake and Stanton Harcourt sewage treatment works.
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A £17million upgrade, which will increase treatment capacity from 240 to 399 litres per second is on track to be completed later this year, he said.
For Standlake and Stanton Harcourt, Mr Courts said he was informed that "Thames Water are working hard on both to ensure they meet the Government targets on storm overflows".
Standlake treatment works, which also takes Northmoor’s sewage, was the single worst performer in West Oxfordshire in 2023, dumping sewage non-stop for 23 days.
Mr Courts said he "continues to stress to Thames Water that timely implementation of upgrading sewage treatment works both locally and nationally is essential and any further delay is unacceptable".
He said: “Like many residents of West Oxfordshire, I remain determined to see healthy waters in Oxfordshire and throughout the whole of the UK.
"As many of you will know, I have personally been campaigning on this issue of sewage pollution since 2017, not long after I was first elected, and I welcome the national prominence this has gathered since then.
"I continue to argue the case for sewage pollution to be addressed at the highest levels with water company leaders like Thames Water, the Environment Agency as well as through regular meetings with the Secretary of State for the Department for Environment, Food & Rural Affairs.”
Today investors refused to inject billions in new money into Thames Water, which is Britain’s biggest water company, leaving the company at risk of an emergency government takeover.
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Shareholders refused to pay a promised £500million after it failed to agree future bills and conditions with the regulator Ofwat.
Charlie Maynard, Liberal Democrat candidate for Witney in the next general election, said: “Our MP has repeatedly voted to let water companies off the hook in parliament.
"Only a tiny fraction of our local sewage treatment works are now being upgraded and almost none of our pipe networks.
"Whatever campaigning he has done has resulted in remarkably little progress."
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