House Drainage, Waste, and Vent Lines
Your drain, waste, and vent system, also referred to as your DWV system, is a system of pipes in and under your house that take waste out and keep it out. This includes everything you flush down the toilet, dirty bath water, and the water that runs through your dishwasher and washing machine.
The DWV system can be broken into the two parts. The drain/waste part of the system carries your home’s waste out and into the sewer system or into your septic tank. Your vents work to prevent gases from the sewer or septic tank from coming into your home. The vents also work to push air into the drain and waste portion of the system so that it can work effectively and without making excessive noise.
Depending on the age of your DWV system, it can consist of pipes made of different materials. Some older systems use cast iron or steel pipes that sometimes need to be repaired and replaced. Some homes also have plastic and copper piping. Each material has benefits and drawbacks. Because DWV systems are designed to last for many years, it is rare that an entire system will have to be replaced. However, regular maintenance should be performed to extend the life of your system and to keep waste from backing up into your home.