What are the typical dimensions of small septic systems?

The typical dimensions of small septic systems vary according to the size of the septic tank and the size of the leach field required by local laws. The size of leach field required usually depends on the number of bedrooms in a home and the type of soil present.

The smallest septic pump tanks have a 200-gallon capacity and average approximately 48 inches by 56 inches, while 300-gallon tanks are roughly 54 inches by 54 inches. A typical two-bedroom home normally produces about 250 gallons of waste water per day. In addition to the tank, the system requires a leach field or drain field that varies from about 200 square feet for coarse sands to up to 1,200 square feet for silt and clay loams.