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You can easily spend a lot of money for little or no benefit...
If you're on a municipal water supply, they are required by law to test for contaminants using independently certified labs, and annually report that infomation to you the consumer. If there is a significant violation, they have to report that at the time of violation. So unless there's an identified problem (which they will have to fix anyway), you could find yourself spending a lot of money on additonal water treatment for peace of mind with no real result. If you're on a well, it won't hurt to have your water tested, but unless you have a reason to suspect contamination, you're most likely fine there too. Personally, I maintain the carbon filter on our home refrig icemaker/water dispenser and keep a Brita filter at work. Not for health concerns, but simply because I think chlorine, particularly chloroamines, taste like crap. For just about everyone reading this, there's only a couple of reasons for spending your hard earned money on point of use devices. That would be for either taste, or for non-health related issues such as high levels of hardness, or things such as high iron or sulfur levels. Written by someone with 35 years experience in water treatment.
Edited by garys5604
Updated - 15th Jun 2011