The 'fluoride' content in drinking water (IS 10500) should be within:
Choose the correct answer
0 mg/L (fluoride always harmful)
0.6–1.5 mg/L — below 0.6: caries risk; above 1.5: fluorosis risk per IS 10500
5 mg/L maximum (no minimum)
Always 100 mg/L
Correct Answer
B. 0.6–1.5 mg/L — below 0.6: caries risk; above 1.5: fluorosis risk per IS 10500
Why is this the answer?
IS 10500: Fluoride permissible range — minimum 0.6 mg/L (below this: dental caries risk); desirable limit 1.0–1.5 mg/L; maximum permissible 1.5 mg/L (above: dental/skeletal fluorosis). Defluoridation: Nalgonda technique, activated alumina adsorption. Fluorosis is endemic in Rajasthan, AP, Telangana, Gujarat (high fluoride groundwater areas).
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