Almost 56m litres of sewage was dumped in a river in 2023, according to campaigners.
The Cleddau Project said Welsh Water data showed pumps at Picton in Haverfordwest, Pembrokeshire, were running at 80% capacity from July 2022 to February 2024.
That meant 55,857,000 litres of waste - equivalent to 17 tankers a day - which should have been going to a sewage treatment plant, was instead going into special conservation area the Western Cleddau.
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