How Big Should a Septic Tank Be?

Septic tanks are sized according to the amount of liquid waste they must process. This is done by counting the number of bedrooms. In New York State the minimum size tank that can be installed now is 1000 gallons for a 1, 2, or 3 bedroom house. For each bedroom after 3, add 250 gallons to the size of the tank. If a garbage grinder is in the kitchen sink, it counts as an additional bedroom.