The National Programme for Prevention and Control of Fluorosis (NPPCF) recommends the maximum permissible limit of fluoride in drinking water in India as:

• A 0.5 mg/L
• B 1.5 mg/L ✓
• C 1.0 mg/L
• D 2.0 mg/L

Explanation

The Bureau of Indian Standards (BIS IS:10500) and WHO both set 1.5 mg/L as the maximum permissible fluoride level in drinking water. Above this level, risk of dental and skeletal fluorosis increases substantially. The NPPCF and National Rural Drinking Water Programme (NRDWP) use this threshold. The optimal fluoride range for caries prevention is 0.5–1.0 mg/L; at 0.5 mg/L the anti-caries benefit is maintained with minimal fluorosis risk.

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

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Written and medically reviewed by the StethoPrep medical team.