Finding your sewer cleanout
Main line clearing starts at the cleanout.
Updated · 3 min read
If you read one thing
A cleanout is a capped pipe that gives access to your main sewer line. In older Alhambra houses look near the front foundation, under the house in the crawlspace, or on the roof as a vent. If there is none, adding one makes every future main line clearing easier.
In this guide
What a cleanout is
The cleanout is a short pipe with a threaded cap that opens straight into the sewer line. Drain machines go in there to clear the main.
Without one, the toilet has to be pulled to reach the line, or a cable goes through a roof vent.
Where to look in Alhambra houses
Close to a quarter of Alhambra's homes were built before 1940, according to Census Reporter. Many of those bungalows sit on raised foundations, and the cleanout may be under the house.
Postwar houses often have a cleanout outside, along the side or front wall where the line exits toward the street.
- Along the front foundation, often near a hose bib
- In the crawlspace below a bathroom
- In a planter or under a bush that has grown over it
- Near the curb, if a two-way cleanout was added
Opening it safely
If the line is backed up, the cleanout can be under pressure. Loosen the cap slowly and stand to the side; sewage can rush out.
If there is none
Some older houses never had an exterior cleanout. Adding one at the point where the line leaves the house gives direct access and makes camera checks simpler.
Alhambra homeowner questions
Is the cleanout the same as the vent on the roof?
No. The roof vent lets air into the drain system. It can be used for access but is harder and riskier.
Can I open the cleanout myself to relieve a backup?
It can relieve pressure, but sewage will flow out. Have a plan for where it goes and wear gloves.
Who owns the line beyond the cleanout?
The lateral up to the city main is generally the owner's. The city can tell you where its part begins.
Data and references