Guest blog post by Elizabeth MacAfee, 12 Oct. 2021 Water quality poses urgent and ubiquitous global challenges. Sanitation-related contamination, industrial pollution and agricultural waste threaten ecosystems and sources of drinking water. The WHO estimates that as many as 2 billion people worldwide use drinking water sources potentially contaminated with harmful bacteria and viruses (www.who.int/news-room/fact-sheets/detail/drinking-water. Emerging contaminants including p