To coincide with the UK release of Hollywood film Dark Waters on 28 February, we’d like to bring to your attention some useful resources on the subject matter: per- and polyfluorinated alkyl substances (PFAS) or colloquially 'forever chemicals'. Dark Waters tells the real-life story of the lawyer who took on a chemical company after discovering it was knowingly contaminating drinking water with PFAS. Although set in the US, the issue of PFAS is a global concern.