Need region wise data for hardness of water

How "hard" is Indian water? My question pertains to "hardness of water" or water containing "high mineral(s) count".  Where can I find out what the mineral count of water is throughout India? I tried googling this information with little luck.  I have found that the average is over 250 to 300 ppm.  Is this true?  Can I find more specific answers, pertaining to region?

Michael Scarn
officemichaelsarn@gmail.com

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