Remember this graph? Since it was produced, the EPA lowered their safe limit. It is closing in on 1 parts per trillion (ppt), down from 70.
This is how much 1 ppt is:
The 1 ppt has broad support, e.g. this study on immune suppression determined, “current limits appear to be several hundred fold too high.”
As EWG says, “Just because contamination is common doesn’t make it safe.”
Fanatic Cook 
Where do you get a water test for your well.
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