A comparison of national drinking water standards for inorganic contaminants for which the World Health Organization (WHO) has calculated Health-based Values (HBVs) or health-based Reference Values (RVs) in milligrams/liter (mg/L) but does not currently have formal Guideline Values (GVs) [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 projects (P-W GDP)/capita within each category, shown in United States dollars (USD).