Watch out: If your concern with septic tank depth is to avoid freezing, DO NOT add antifreeze to a septic system. Septic tanks can be installed pretty much at any depth in the soil.Įven in freezing climates, the septic tank serving an occupied home or even an unoccupied one is unlikely to freeze, partly because of latent heat the bottom of the septic tank receives from the earth and partly because of the heat generated by the bacterial action going on in the septic tank, and mostly from warm wastewater entering from the building served by the septic system. Septic Tank Installation Depth How Deep Should We Put the Septic Tank at Original Installation? We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Here we describe the depth at which septic tanks are installed and we describe several factors that influence the actual depth to which a septic tank (or cesspool or drywell or soak-pit) will be buried.Ī companion article linked-to at the end of this one explains the septic tank depth sketch shown at the top of this page and describes in detail how to find the actual depth of an existing installed septic tank. Septic tank design depth: To what depths are septic tanks or cesspools or seepage pits or drywells commonly buried?ĭo we need to put the septic tank below the frost line to avoid freezing? We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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