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Usually, but not always, where it leaves the basement it should be at that level straight to the street or alley depending on which way it goes. If you don't have a basement, from the toilet or where the vent goes through the roof straight to the street or alley. If you are on a septic, it may be a straight shot or come out and 90 degree to the tank, depending on where the tank is in relation to the house. It is usually the shortest route between the main stack which is the toilet and the main sewer line or septic.

It will be at the depth of the drain when it leaves the house. If you have a floor drain, that means it's 6 to 8 feet down.

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Q: How do you find the main drain pipe on my house?
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