In one of the first U.S. studies to look at numerous brands of PEX pipes and their effects on water quality, Whelton's research team tested six brands produced by different manufacturing methods. They found that each type caused odors exceeding the Environmental Protection Agency's guidelines, and leached chemicals such as toluene, which is neurotoxic, and MTBE, a carcinogen that's been banned as a gasoline additive, but is a byproduct produced during PEX pipe manufacture.
Mark Tudor wrote:The papers linked above seemed to indicate that clorine in the water had a greater effect on smell/levels, but honestly if it's releasing chemicals that you are either consuming or washing in, I wouldn't gamble the health of the family over it. I was thinking PEX would be a convenient option for a homestead, but not if all the brands are leeching into the water. I have a Berkey filter but I'm doubting it would clean up the leeched compounds.