The underground system of pipes or tunnels to transport wastewater from homes and commercial buildings to a wastewater treatment or disposal plant is called collector[1]​ or sewer[2]​. It is built underground, often in the middle of major streets, so that each of the homes on that street can be connected for proper wastewater disposal. The collectors lead the water to a main collector or interceptor that will take the water to a treatment plant or, failing that, will discharge it into the natural environment.

Each connection belonging to a home is called connection or home connection. This includes the pipe that goes from the intrados well or from the final inspection chamber of the home to the collector.

Both the collectors and the household junctions must be designed with a certain slope to allow the flow of water by gravity,[3]​ but never extreme, to avoid excessive speeds and risk of erosion. Likewise, their joints must be airtight to prevent wastewater leaks into the ground and to prevent the entry of rainwater, infiltration of the surrounding ground or the introduction of roots. On the other hand, they must be smooth so that obstructions do not occur due to the accumulation of hair, fabrics, diapers and other items usually thrown into the sewer, despite being prohibited.

The free flow of water within household connections and collectors is usually verified by means of the "ball" test, an artifact that must flow without problems from the place where it was introduced to where the examination is being carried out.

It is essential that the design and construction of these facilities be carried out by authorized professionals or technicians.

https://www.ecured.cu/Alcantarillado.

http://www.epas.mendoza.gov.ar/index.php/sistema-sanitario/cloacas.

• - Sewer "Sewer (construction)").

• - Sewerage.