How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
Can a house have more than one septic tank?
Saturday, November 17, 2018
Yes, and the reason a second tank and drainfield is necessary usually has nothing to do with providing additional gallons of tank capacity. Plumbing drains work by gravity, and the drain pipes need a minimum of 1/8” to 1/4” per foot of downward slope for the effluent to drain from the house to the tank. Too much slope and the solids get left behind, not enough slope and they don’t move along.
So this requirement puts a limit on how far away the septic tank can be without it ending up too deep in the ground for the drainfield to function properly. We see homes with two septic tanks most often at the long, narrow ranch style homes of the mid-20th century–with one system located near each end. Houses are rarely built like that today. Also, it is now possible to install a buried holding tank and electric pump, called a “grinder pump,” to extend the range of the drain line as an alternative to a second tank. To learn more about them, see our blog post What is a grinder pump?
To learn more about SEPTIC TANK SYSTEMS, see these other blog posts:
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