Imagine having something that can cause cancer being in the drinking water almost everywhere. That’s what this report talks about. http://www.pbs.org/newshour/rundown/chromium-6-wash-many-drinking-supplies/
I think we need to set aside the “Erin Brokovich effect” for a second and remember that chromium-6 occurs in the environment naturally. So where our concerns should be with this contaminant is in the industrial sector.
California has already set a benchmark at 10 ppb. I’ve heard some want the benchmark to be something like .02 ppb.
So it is probably a good idea to regulate it in some way. And it’s probably a good idea to have an ion exchange filter at home to make sure you aren’t getting any of it.