1. World Health Organization, United Nations Children’s Fund. Progress on Drinking Water, Sanitation and Hygiene: 2017 Update and SDG Baselines (2017).
2. Allaire, M., Wu, H. & Lall, U. National trends in drinking water quality violations. Proc. Natl Acad. Sci. USA 115, 2078–2083 (2018).
3. Etzel, R. A. & Balk S. J. Drinking Water. Pediatric Environmental Health 4th edn, 277–291 (American Academy of Pediatrics, 2018).
4. US Environmental Protection Agency Nonpoint Source Control Branch. Protecting Water Quality from Agricultural Runoff (US Environmental Protection Agency Nonpoint Source Control Branch, Washington, 2005).
5. Pal, A., He, Y., Jekel, M., Reinhard, M. & Gin, K. Y. Emerging contaminants of public health significance as water quality indicator compounds in the urban water cycle. Environ. Int. 71, 46–62 (2014).