<prompt> Fluoride level permissible in drinking water ?0.5 mgL0.5-0.8 mgL1 mgL1.5 mgL  <response>: Ans. is d i.e., 1.5 mgL The recommended level of fluoride in drinking water in the country is accepted as 0.5 to 0.8 mg Liter. -Park o Maximum permissible limit is 1.5 mgLit. Guidelines of for drinking water Colour 15 true colour units TCU Turbidity 1 nephlometric turbidity units NTU Hardness 100 - 300 mglitre calcium ion o pH: 6.5-8.5 Total dissolved solids TDS 600 mglitre Chloride 200 - 600 mgL H,S 0.05 mgL Iron 0.3 mgL Sodium 200 mgL Sulphate 250 mgL Zinc 4 mgL NH3 1.50 mgL Fluorine 1.5 mgL 0.5 - 0.8 mgL : Optimum level Nitrates 50 mglitre Nitrites 3 mglitre Gross alpha radiological activity 0.1 Bqlitre Gross beta radiological activity 1.0 Bqlitre Zero pathogenic microorganisms Zero infectious viruses Absence of pathogenic protozoa and infective stages of helminthes Dissolved 02 has indirect effect, level is not specified. 