If I read the IRC-2006 correctly (and I believe prior editions as well), PVC is allowed as material for "water service pipe" (ASTM 1785) by P2904.4.2 but NOT in "Water Distribution pipe". (I'm in a discussion with a "certified plumber" who claims that where he is from, Florida, PVC is 'always' used for cold water distribution as long as CPVC is used for hot water. Personnally I think he is full of hot air). I understand the prohibition of use as supply pipe for hot water (sched 40 PVC is only rated for 140 psi at 73 degree), but can anyone explain why it is allowed for use as water service, but not allowed for use as distribution pipe for cold water?

In this case, the home is on a well where water pressure would only run about 30-55 psi at best.

2nd question; not being a plumber, what color of cement is used for CPVC? His house had a vivid blue color staining around the joints (both PVC and CPVC), which I don't recall seeing before on CPVC. Does anyone know of any problems if the wrong cement is used?