What standards should qualified drinking water meet?

The seven standards of the World Health Organization on healthy water are 1, which is non-toxic, harmless and tasteless; 2. Balanced minerals and trace elements; 3. The 3.PH value is weakly alkaline; (7.2-7.8) 4. Small water mass; (Half-width of NMR is less than 100HZ) 5. Medium hardness water 6. Moderate dissolved oxygen and carbon dioxide.