Question:easy
What is the recommended level of fluoride in drinking water?
What is the recommended level of fluoride in drinking water?
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Recommended fluoride is 0.5 to 0.8 mg/L; maximum permissible is 1.5 mg/L.
Updated On: Jun 24, 2026
- 0.2 to 0.5 mg/L
- 0.5 to 0.8 mg/L
- 0.8 to 1.2 mg/L
- 1.2 to 2.0 mg/L
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: The fluoride concentration of water must be kept in a tight window so that teeth are protected from decay without inviting fluorosis.
Step 2: The accepted recommended figure for the country lies between $0.5$ and $0.8$ milligram per litre.
Step 3: Values from the lower band of 0.2 to 0.5 are insufficient, while the higher bands approaching and exceeding 1.2 push toward the permissible ceiling of $1.5$ mg/L and the risk of mottled enamel and bone changes.
Step 4: Thus the recommended level is 0.5 to 0.8 mg/L.
\[\boxed{0.5\ \text{to}\ 0.8\ \text{mg/L}}\]
Step 2: The accepted recommended figure for the country lies between $0.5$ and $0.8$ milligram per litre.
Step 3: Values from the lower band of 0.2 to 0.5 are insufficient, while the higher bands approaching and exceeding 1.2 push toward the permissible ceiling of $1.5$ mg/L and the risk of mottled enamel and bone changes.
Step 4: Thus the recommended level is 0.5 to 0.8 mg/L.
\[\boxed{0.5\ \text{to}\ 0.8\ \text{mg/L}}\]
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