Proposed guideline values for Radioactivity in Drinking water is

Key guideline aspects of WHO recommended drinking water quality: – Colour < 15 true colour units (TCU) Turbidity < 5 nephlometric turbidity units (NTU) pH: 6.5 – 8.5 Total dissolved solids (TDS) < 600 mg/litre Zero pathogenic microorganisms Zero infectious viruses Absence of pathogenic protozoa and infective stages of helminthes Fluorine < 1.5 ppm (0.5 – 0.8 ppm: Optimum level) Nitrates < 50 mg/litre Nitrites < 3 mg/litre Gross alpha radiological activity < 0.5 Bq/litre (New Guideline — WhO) Gross beta radiological activity < 1.0 Bq/litre (New Guideline — WhO).