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What Is a House Sewer?

A house.
A house sewer is where all waste and soil pipes inside of the home or building will ultimately discharge.
A house sewer is the term given to the connection of the horizontal house drainage system to the public sewer.
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  • Written By: Kevin P. Hanson
  • Edited By: C. Wilborn
  • Last Modified Date: 26 September 2014
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A house sewer is the term given to the connection of the horizontal house drainage system to the public sewer. It is where all waste and soil pipes inside the home or building will ultimately discharge. The house drain extends through the foundation wall and continues from the main drain to where it enters a public sewer or cesspool.

Under most conditions, it is highly recommended that a house sewer drain be used to serve only one building. Large metro areas often have huge buildings that require two drains and sewers in order to manage the enormous amount of sewage created in them. Even in this case, the two sewer systems are completely separated according to whichever side of the building each serves.

Usually, the house drain stops about 10 feet (3.04 meters) outside the home’s foundation walls. It is here that it enters the house sewer, which is usually made out of vitrified earthenware pipe, although in some homes it may be constructed of cast-iron. Most plumbing ordinances prohibit the existence of earthenware piping anywhere inside the foundation walls, including any part of the drainage system. This is due to the fact that cement joints used in this version of piping are prone to crack or bust open. If that happens, sewage will leak out, causing unsanitary conditions.

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The house connection typically extends only to the curb line, but in some cases it will continue to the fence line or to the house sewer at the wall of the foundation. The municipal authorities usually supervise this part of the drainage system. A plumber might be allowed access to it, but only if certain conditions are met and restrictions adhered to. Many cities have an appointed house sewer inspector who is in charge of inspecting every part of the work done on the house connection.

In order to prevent the waste inside the street sewer from flowing back into the house sewer, it is recommended that the branch for the house sewer enter the street sewer above the center at a high enough point to ensure that this will not happen. If the house sewer is being flooded with sewage from the backing up of the street sewer, there will be an excellent chance that the house sewer will get plugged up with waste.

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