PVC is a toxic compound, but after several years, there will be a layer of sludge coating the inside of the pipe that keeps you from drinking the nasties.
- Since the rest of your house is copper, I recommend that you install a whole-house water filter on the main line and use a charcoal-impregnated filter.
- Install valves on both sides, so you can easily replace the filter cartridge every 2-3 months.
For more information:
Read "I'm seeking bids to repipe my house. PVC is recommended by all three plumbing bidders. Is it safe?" a Q&A answered by Michael Heacock.