London’s tap water contains PFAS, but at surprisingly low levels

London’s tap water contains PFAS, but at concentrations well within current safety limits. That is the key, and somewhat unexpected, finding from the largest UK survey of PFAS in household water supplies. ‘None of us knew what we were expecting going into this … but we were a bit anxious what we would discover, says Alexandra Richardson from Imperial College London, who led the work. ‘Overall, this is a good news story. London’s surface waters are some of the most contaminated in the country, and the drinking water abstracted from those source waters is within guideline limits.’