Septic Tank Size For 3 Bedroom House. The septic tank size must be adequate for the flow that you are producing. Minimum of 900 gallons tank;
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It is 3 inch pipe all the way to the foundation wall. The size, style and construction fo your septic tank or cesspit is correct size for a septic tank depends on the number of people using the system, which in turn is determined by the number of bedrooms in the house. Standard sizes for septic tanks and why they overfill. If an undersized septic tank exceeds its holding capacity, sewage can back up into your home, so when you're putting in a septic tank, it's essential sizing rules vary slightly from location to location.