Drink Water From Tap?

When I first heard about it from my friends several years back, but was thinking that it is rather strange if M'sia would someday drink water from tap.

I am sure even after installing several water filters in your house, you would still boil the water before you drink. This method had been passed down from generations to generations and is still being used through M'sia.

How clean would the tap water be? Can it possibily happen in M'sia?