<prompt> Criteria for drinking water quality recommended by WHO includes a Colour 15 TCUb pH 6.58.5c Chloride 200600 mg1d Turbidity 5 NTUe Zinc 4 mg1bcdeabceacdeabde  <response>: Guidelines of for drinking waterColour 15 true colour units TCUTurbidity 1 nephlometric turbidity units NTU has been changed in 22nd e of Park Hardness 100 300 mglitre calcium ionpH: 6.5 8.5Total dissolved solids TDS 600 mglitreChloride 200 - 600 mgL H2S 0.05 mgLIron 0.3 mgLSodium 200 mgLSulphate 250 mgLZinc 4 nagLNH3 1.50 mgLFluorine 1.5 ppm 0.5 0.8 ppm: Optimum levelNitrates 50 mglitreNitrites 3 mglitreGross alpha radiological activity 0.1 BqlitreGross beta radiological activity 1.0 BqlitreZero pathogenic microorganismsZero infectious virusesAbsence of pathogenic protozoa and infective stages of helminthesDissolved O2 has indirect effect, level is not specified. 