Well, people who don't want to taste chlorine, yes.

Depends where you are. It doesn't need to be at tasteable levels; the US apparently uses rather a lot and has poor quality control (Flint passim)

http://www.dailymail.co.uk/health/article-2242094/Chlorine-t... (apologies for poor source)

It depends on how chlorinated the water tastes. I usually use the filtered water that comes out of the tap on the fridge but if that is taking too long to fill a bottle, I just use the regular tap water. Our water tastes fine. It doesn't have a strong scent or flavor and the water is very clear. Checking out the water quality reports for my county, we meet or exceed all EPA regulations regarding certain materials in the water. Some people in my county still rely on well water because they were too far from the water main when their house was built. Well water tastes gross and you pretty much have to filter it unless you just hate yourself. As for the quality of the well water in my county, I can't find this information as I'm guessing everyone's well water is different and no one is going around testing homeowners' wells. Chlorinated water is used in many places around US as it's cheap and effective. It reduces things like microbes and bacteria in the water supply. It can produce some nasty by products but the risk from consuming chlorinated water is much lower than consuming water that is potentially swimming in microbes and bacteria.

I use it in London, Not because the water is too chlorinated, but it really improves the taste.