What is the highest C-factor associated with PVC pipes?

The C-factor, or Hazen-Williams C-factor, is a measure of the friction loss in water distribution systems, with higher values indicating smoother pipe surfaces that allow for better flow with less resistance. For PVC pipes, the C-factor typically ranges from 100 to 150, depending on the type and condition of the pipe.

The highest C-factor you can expect from PVC pipes is 150, making this the correct answer. This is due to the inherent properties of PVC, which has a smooth interior surface that reduces turbulence and friction when water flows through it, compared to other materials like metal or concrete, which have rougher surfaces and therefore lower C-factors.