This week's roundup covers a call from more than 80 health and environmental groups for the WHO to re-evaluate its 1958 nitrate guideline value, and a new analysis reporting PFAS in US water systems serving an estimated 197 million people. Incidents include a city-wide boil water notice in Melbourne, Florida, after flooding damaged a main, an E. coli boil water notice lifted in Fall City, Washington, and faecal contamination affecting 164 households in Ledeuix, France.

This week's roundup covers short-lived boil water events in Central Otago and western Queensland, the first joint performance report from regulators in England and Wales, and continuing incidents in South Africa, Ireland and the United States. Items are drawn from reports published between 25 October and 1 November 2026. Australia & New Zealand Incidents Omakau and Ophir boil water notice issued and lifted within days (Central Otago, NZ) Central Otago District Council placed