Leaching studies conducted in the US found that CPVC plumbing pipes leached potentially toxic chemicals such as chloroform, tetrahydrofuran, methyl ethyl ketone , acetate into drinking water. These chemicals may cause cancer in Human beings. They also cause ozone pollution. Phthalates affect the liver. 

Toxins in PVC pipes and adhesives:

PVC's contain heavy chlorine content and dioxines. At least one dioxin is classified as carcinogen. They are endocrine disruptors and interfere with the production or activity of hormones in the human endocrine system. They also contain lead that can permanently damage the brain.

Lead is used in 95 percent of PVC pipe in India, 86 percent in the Middle East and Africa, and 61 percent in South America, according to figures from German stabilizer maker Baerlocher GmbH . It is a widespread problem across the world.

In Europe, by contrast, 29 percent of all PVC pipe systems use lead, while in North America, the figure is less than 1 percent, because nearly 100 percent of vinyl pipe systems use tin as a stabilizers.

It’s a toxic shell game the chemical industry has been playing, and just another example of how vinyl is a fundamentally poison plastic.

People say PVC pipes are cost effective but they can cause several health problems which make you spend lots of money in the long run so they  are not actually cost-effective in reality!

PVC pipes  for drinking purposes have been banned in several countries. 

Synthetic adhesives (used to join the PVC and  CPVC pipes) like epoxies, polyurethanes, cyanocrylates and acrylic polymers - all of them are deadly toxins. Most of them are carcinogenic ( they contain solvents such as benzene, toluene, xylene, styrene, acetone, methanol, phenol and dichloromethane). They destroy red blood cells and  inhibit immune system  apart from causing cancer.