Installing a basement toilet

Written by jim hagerty
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Installing a basement toilet
(Jim Hagerty,

Upflush Toilets

A basement toilet must be capable of pumping water upward through the main sewer pipe if the unit will be installed below the pipe grade. Such toilet systems are known as "upflush" toilets. With an upflush system, waste material is routed to a small tank located behind or to the side of the toilet. When the toilet is flushed, the tank begins breaking down the waste and pumps it into a discharge pipe. From the discharge pipe, it is pumped up through the sewer pipe and out of the basement.

Ejector Systems

Similar to how an upflush toilet works, a waste ejector system is a pump located in a basin dug into the basement floor. When the toilet is flushed, waste material is pumped into the ejector basin (installed much like a sump pump unit). As it is treated and broken down, it is pumped upward into the sewer line, where it's then flushed out of the house.

Installing a basement toilet
An ejector system pumps waste upward into the main sewage line.


Regardless of whether an upflush toilet or ejector system is used, a proper location is chosen. While a basement toilet can be placed anywhere, minimal amount of plumbing will be required for toilets close to the main sewage line. Electrical sockets must also be close to power an electric ejector pumps. When a location is chosen, water is routed to the area and connected to the toilet. The uplush tank is then installed with plumbing connected to the toilet. The upflush pipes are then routed to the sewer line. Ejector basins are usually dug before installation of an ejector toilet system. When the basin is dug and the pump secure, water supply is run to the toilet area. The toilet's discharge pipe is routed into the ejector tank. A discharge pipe connects the basin to the main sewer line. When plumbing connections are secure and toilet is tested, tile and other fixtures are built around the toilet.

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