Stainless steel sewage pipe and fittings are the way to go for drinking water. Stainless Steel sewage pipes doesn't rust, it lasts forever and nothing leakes out into water.

Traditionally used materials for underground drainage and sewage pipes such as clay, concrete or even iron still hold a significant market share Sewage and drainage pipes are usually not exposed extensively to sunlight. Most of the applications are underground or in-house, and the pipes are exposed to sunlight only briefly during their installation.