Which pipe material is the ...

Which pipe material is the best for water supply networks in terms of quality of water supplied ?

Plastic pipes (UPVC):

The raw material needed to make most plastics comes from petroleum and natural gas. Due to their relatively low costs, ease in manufacture, versatility, and imperviousness to water, plastics are used in an enormous and expanding range of products: from paper clips to pipes intended for transporting drinking water. Plastic has replaced many common materials such as cement and metals within drinking water networks. Plastics are often preferred than metals due to a number of inherent advantages: plastic piping is lightweight and does not require an open flame for joining the flexibility of plastic can simplify the installation. Plastics are typically lower in cost and resist the corrosion and scaling that plague metals in some applications. However, indication of the mitigation of synthetic chemical contaminants from plastic pipe materials to water may exist. These contaminants likely occur at low “safe” levels, but are sufficient to generate odour and taste concerns in some cases. Another disadvantage of some types of plastic pipes is that they have lowered resistance to chlorinated water.