I'd be careful with the assumption that just because you're doing fine now, means you will continue to when you're 50+.

Watch this, if you haven't already:

https://www.youtube.com/watch?v=84glf6F3b-Y

"The Devil We Know". It's a documentary about the Ohio river valley polution by 3M and Dupont in the production of Teflon. There are many amazing parts in this documentary but one of the most eye opening, is the fact that Dupont understood the risks of dumping C8 into the water. Yet the continued to do it, because, profits.

Who can say what companies are around you, polluting the ground water? Just be careful with assumptions that its always safe, is all I'm saying. I'm sure people in the Ohio River Valley thought the same.