Hello sampathi,

The World Health Organization (WHO) Guideline for drinking water Quality (GDWQ) include the following recommended limits on naturally occurring constituents that may have direct adverse health impact: Arsenic 10μg/l. Barium 10μg/l. Boron 2400μg/l.

And the bis water standard are eventually based on the same to same condition there is a brief file released by BIS who can download from official site and read it .

All the best