Whenever something has been identified as a carcinogen, hasn't it been because a large number a people were exposed to exceptionally high levels of it before they developed cancer? Yet many cancers seem to have a genetic component involved. So, maybe your chances of getting cancer from small levels of carcinogens is determined by your genetics (in which case it's more like an allergen than a poison), while it takes very high levels to cause people who don't have the genetic predisposition to get cancer.
As long as you don't have a family history of the cancers caused by these chemicals, maybe you shouldn't worry about it. I say "maybe" because I know everyone has something they worry about and try to protect against to make them feel safe enough to enjoy their lives. For me, it's germs. I wash my hands like crazy, even though I don't worry about a lot of other things that may be more dangerous to my health than germs. If filtering your water will give you peace of mind, I say go for it, whether your water is polluted or not.
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