A comparison of the 2022 World Health Organization (WHO) Guideline Values (GVs) in milligrams/liter (mg/L) for inorganic contaminants in drinking water to the current national drinking water standards [18].

Minima and maxima are listed twice, first with all values as written in sources and then with potential typographical errors removed. Country categories are compared by raw count of countries and then by percentage of world population within each category. Income differences between categories are compared using population-weighted gross domestic product (P-W GDP)/capita within each category, shown in United States dollars (USD).