The desirable range of pH for drinking water is
6.5 to 8.5
5.0 to 6.5
6.5 to 7.0
7.0 to 8.5
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This question was previously asked in
UPSC NDA-2 – 2017
pH is a measure of the acidity or alkalinity of water. A neutral pH is 7.0. Water with a pH less than 7 is acidic, and water with a pH greater than 7 is alkaline. The standard recommended range for potable water generally falls within the slightly acidic to slightly alkaline range, as extremely low or high pH can affect palatability, corrosion potential, and the effectiveness of disinfection.