The old rule of thumb was that only a few percent of cancer cases are due to environmental contaminants. A new report from the President's Cancer Panel suggests we have much more to worry about.
It's a big part of who I am to scoff at people who cling to new fears. My grandparents didn't need to drink filtered water and I'm sure not gonna start that as a new tradition.
However, a recent On Point episode kinda freaked me out. I normally don't pay much attention to environmental alarmists, but my attention was snagged when one of the guests (who was arguing that our world is contaminated) dismissed the blanket assertion of a caller that buying organic food was a reliable way to protect yourself from toxins. They also gave the specific example that some municipalities treat their drinking water such that it becomes contaminated with carcinogens - and that you should filter your water.
I guess the only options are heavy-handed regulation or living in a neurotic bubble?