This week's roundup covers a precautionary boil water alert in Boulia, Queensland, disinfectant-related taste and odour complaints in south-west Sydney, continuing barium issues at Bulla in the Northern Territory, New Zealand's latest national drinking water regulation report and a Wairarapa boil water notice, and a short-lived E. coli advisory in the United States. Australia & New Zealand Guideline & regulatory updates Taumata Arowai reports gains in protozoal treatment, but