A recent meta-analysis of 30 studies involving 90,000 participants found that water chlorination levels common in the US and EU likely increase bladder cancer risk by 33% and colorectal cancer risk by 15%.
I find this particularly interesting because my dad died of bladder cancer and my aunt died of colon cancer. Needless to say, I'm going to continue to filter my water.
Alternatives exist but are costly. Experts recommend continued tap water use with effective filtration, such as granulated activated carbon.
Oh, well, if they're costly then it's fine. What are human lives compared to money, anyway?