What are the requisites for potable water?

Potable water: means the water which is safe to drink.

Essential requirements: The water should be 

 clear

 Colorless and Odorless

 Pleasant in taste

 It should not have turbidity (not exceed 10 ppm)

 pH should be in the range of 7.0-8.5

 Free from gases like H2S & minerals like Pb, As, Cr & Mn salts

 Total hardness should be less than 500 ppm

 Free from disease producing bacteria