为应对干旱，泰晤士水务在英国伦敦西南部Teddington段开展了一项将处理后的污水泵回泰晤士河的水循环试点项目，但最新数据显示该项目导致有毒“永久化学物质”Pfos浓度大幅飙升1。监测结果表明，试点一的Pfos浓度达到6.3纳克/升，试点二为8.7纳克/升，最高达到英国地表水0.65纳克/升法定限值的13倍1。这一超标结果与该公司公开声称不会损害河流环境的说法相矛盾1。
该水循环项目计划每天从泰晤士河Teddington段抽取最多7500万升水，而泰晤士水务每天漏水5.71亿升1。该项目原成本至少为3.5亿英镑，现预计升至逾5亿英镑，同时泰晤士水务负债200亿英镑1。该项目面临环保组织和地方政界的反对，且环境署曾在2019年因环境影响拒绝过一项类似方案1。针对试点数据，泰晤士水务称试点数据不代表运营后的排放情况，环境署则表示将继续进行严格环境评估1。
A water recycling pilot project designed to combat drought by pumping treated sewage back into the River Thames has resulted in a surge of toxic "forever chemicals," contradicting Thames Water's claims that the initiative would not harm the river environment 1. During the trial in Teddington, southwest London, concentrations of PFOS reached 13 times the legal limit 1. The statutory limit for PFOS in UK surface waters is 0.65 nanograms per liter, yet the first pilot site recorded levels of 6.3 nanograms per liter, while the second site hit 8.7 nanograms per liter 1.
The scheme plans to extract up to 75 million liters of water daily from the Teddington stretch of the River Thames, contrasting with the 571 million liters Thames Water loses to leaks every day 1. The project's estimated cost has risen from an initial budget of at least £350 million to over £500 million, adding pressure to the company, which is burdened with £20 billion in debt 1. Facing opposition from environmental groups and local politicians, the Environment Agency stated it will continue to conduct rigorous environmental assessments, noting that it previously rejected a similar proposal in 2019 due to environmental impacts 1. In response to the trial data, Thames Water argued that the pilot results do not represent the discharge levels expected once the facility is fully operational 1.
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