Question

why do you think there are so few cases of private water supply in the world

Answer 1

$< marquee > thank \: u \: for \: akin$
because the water pipes ,that are of sewage ,clean water can mix uo

Answer 2

Private companies work for a profit. Providing public facilities like water supply is not a profitable business. More over the capital needed to provide water supply to the entire population is very high which very few private companies will be able to bear.