What Wastewater Surveillance Should Measure Next
Wastewater surveillance had its breakthrough during the pandemic, when sewage signals tracked SARS-CoV-2 infections and population-level trends. Europe now wants to do far more with it. The recast Urban Wastewater Treatment Directive (EU 2024/3019) extends monitoring to antimicrobial resistance (AMR), turning a research tool into a routine task for utilities.
A growing body of work asks an awkward question: what will those measurements actually mean? The answer matters to any operator about to pay for sampling, and to any health authority about to act on it.
What the directive asks for
Article 17 requires member states to monitor AMR at urban wastewater treatment plants of agglomerations with 100,000 population equivalent or more (Hock et al., 2026). It also specifies that relevant public health parameters be monitored "at least at the inlet" (Naziri et al., 2026). Scope and means of compliance are still being defined, according to Hock and colleagues.
A national Swiss campaign has run every PFAS method in the Commission's guidelines side by side, and none of them can name most of the organic fluorine in wastewater.
A meta-analysis of 455 datasets finds that fertilisers made from separated urine and faeces perform as well as mineral fertiliser, so the open questions are now quality assurance and regulation.
Prague's draft law transposing the recast EU wastewater directive puts the investment bill at up to CZK 176 billion and gives a detailed view of what the rules mean for a central European member state.
A Stanford model shows that if neighbouring wastewater plants plan their nutrient removal upgrades together, capital and operating costs can fall by almost half.
