Most jurisdictions want to see a minimum of 1000 gallons. But the right septic tank size depends on the anticipated usage not an arbitrary number.
To determine the required septic tank size you would need to come to a serious estimation of based on daily water volume usage.
Be aware that sizing septic systems based on the number of bedrooms in conjunction with the floor area of a house may be more accurate than using the number of bedrooms alone.
Septic tanks that may have been adequate in size may no longer be when family size increases or as the house is enlarged.
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