Check out the above cool search engine site from The National Safety foundation.
Meanwhile see this…
PVC, CPVC, PEX, and Other Plastic Plumbing Materials
Plastic plumbing has been used for potable and non-potable water applications since the 1950s. Initially, there were many concerns about these products potentially leaching harmful chemicals into the water. To ensure that the public’s health was protected, independent standards were quickly developed which established strict guidelines for these products.
Today, plastic plumbing products designed for potable water applications are usually designated with either “NSF-PW” or “NSF-61” to indicate that the product complies with the health effects requirements of NSF/ANSI Standard 61 for materials designed for contact with potable water. This standard also establishes similar guidelines for other plumbing materials, including copper tubing. If your pipe is not coded with one of these designations or if it is designated with an alternative code such “NSF-DWV,” it is probably not meant for potable water applications and should not be used for such purposes.