It will definitely leach from PVC pipe. I'm not sure about PEX. Yes to water dispensers in refrigerators. In general, the problem will be worse with smaller

It will definitely leach from PVC pipe. I'm not sure about PEX. Yes to water dispensers in refrigerators. In general, the problem will be worse with smaller diameter pipes/tubes due to surface area/volume ratio, worse if the water has been standing in the pipe/tube, and worse if the water is hot. These chemicals are extremely difficult to get away from. I saw a study where they tried to get volunteers to take a reasonably large set of actions to reduce their levels of BPA and Phthalates, and they were able to get them down to about half the original levels, but not lower.