Sure, chlorine is great for killing bacteria in the water before you drink it, but the problem is that our intestines are full of good bacteria that help to digest our food. When we drink chlorinated water the chlorine can't tell the difference between the good bacteria and the bad. Studies have linked the consumption of chlorinated water to some types of cancer.
So if you have to drink tap water, at least run it through a filter first.
One think you need to rememeber is by the time it gets to you the it at such low levals that it does not really do any damage. What makes chlorine so good is how it works. First it will kill everything in it and then it has a residue effect. It more or less just prevents new growth does not really kill and it keeps dropping in level over time. Sorry I do not have access to the data on it plus my understanding of the finer points is pretty bad.
Also do not forget any increase in deaths cause by it in by far is over shadows by the number of lives it saves. Problem is people read these studies and do not see the other little details in them on the finer points.
THe general public is pretty stupid when it comes to things like this and go screaming at the headlines. All the bottle water you drink has chlorine in it. Other wise it would not stay safe to drink during transport. Plus it going to chlorinated when they bottle it anyway and treat it.
The other systems out there while good at killing stuff the draw back comes as they have no residue effect and they cost a heck of a lot more to run.