The homes plumbing system inspection is very important. There are actually two different basic systems. The Drain Waste and Vent (DWV) system and the plumbing or “potable” water supply system. The DWV system consists of the drain and waste lines for conveying the used water and sewage to an appropriate location. The vent pipes allow air into the system or vacuum would not allow the drains to correctly flow, the vent pipes also vent harmful sewer gasses into the atmosphere away from (or what is considered an safe distance) any openings in the building envelope. The supply or distribution system conveys clean or “potable” water to faucets and fixtures. Care must be taken when installing certain fixtures or cross contamination will damage the pipes and is an serious health hazard. There are many different materials that are available on today’s market. Being able to identify these materials and if they are correctly installed is an skill all Experienced Home Inspectors Must Have.
Most homes have cross contamination issues that can be easily fixed.