[A CA Guy]

I read in earlier posts that some felt it left a plastic taste in the water. Can that be or is that in their mind?

I ask because many of these man made materials end up being caustic to the human body.

Also, is this legal to use now in California for both hot and cold water?

[smoking camels]

I think it is in their mind... but I am the same way! LOL

I am not sure what all is legal in CA.

Let me emphasize that PEX cannot ever flavor water of leach chemicals into the water.

[AlexW]

I live in west Tennessee, out in the country where we have well water that has very low ph...Talk about bad taste!!, just wait till you taste it from copper.
In older houses, you have to run the water for a minute to purge the bad taste. This is not a problem in municipal water systems where the water is treated.
The acid water also eats the pipe, and you soon get pinhole
leaks.
Almost all pipe here is pvc or cpvc. In a house that I built myself, it was all that I used. In an old house that I bought, we could not wait till we could get rid of the few leftover coper lines.