this photo shows the drain pipes for the master bathroom, which are made from CPVC. living building challenge has red listed this material. unfortunately, the house will not meet the materials challenge of the living building challenge for this and other reasons that i will discuss when the slab insulation goes in.
the alternative is ABS drain pipes. the plumber was not comfortable using ABS and feared that there might be leaks. so, i am using PVC drains. overall i am minimizing its use.