The permissible limit of fluoride in drinking water as per BIS (IS:10500:2012) is:

• A 0.5 mg/L
• B 1.0 mg/L
• C 1.5 mg/L ✓
• D 4.0 mg/L

Explanation

The permissible limit of fluoride in drinking water as per BIS IS:10500:2012 is 1.5 mg/L (maximum permissible limit in absence of alternative source). The desirable limit is 1.0 mg/L. Levels above 1.5 mg/L cause dental fluorosis; above 4 mg/L cause skeletal fluorosis. WHO guideline value is also 1.5 mg/L. Levels below 0.5 mg/L are associated with dental caries.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.