* The World Health Organization (WHO) published updated guidelines for drinking-water quality (GDWQ) in 2017.
*The International Organization for Standardization (ISO) published  regulation of water quality in the section of ICS 13.060, ranging from water sampling, drinking water, industrial class water, sewage, and examination of water for chemical, physical or biological properties. ICS 91.140.60 covers the standards of water supply systems.