Plumbing contractors are becoming very familiar with the new standard, NSF 61. This standard has been cursed and praised by the industry. It came to light over the strict regulation for faucets. Plumbers, especially in California, watched as manufacturers fought, struggled, and gave in to NSF 61. The new federal regulations require all faucets supplying drinking water to conform to this standard.
You have also realized that this standard applies to pipe and fittings. Copper ran into problems with low pH water, as I had previously reported. Brass fittings for PEX also ran into problems.