For example, a 1,000-gallon septic tank would be needed for a three-bedroom home that is less than 2,500 square feet. Septic tanks are also typically located far away from wells so as not to ...

— 1,000-gallon tank for a home under 2,500 square feet, three bedrooms. — 1,250-gallon septic tank for a home between 3,500 and 4,500 square feet, four or five bedrooms.