The answer to 'average cost of septic tank' is that the typical range for a new septic tank installation can vary widely, usually between $3,000 to $10,000 or more. The final cost depends on several key factors, including the size of the tank, the type of system (conventional, aerobic, etc.), the soil conditions, accessibility of the site, and local permit and labor costs.
In general, larger tanks (1,000-1,500 gallons) tend to be more expensive than smaller residential tanks (500-750 gallons). The material of the tank, such as concrete, plastic, or fiberglass, can also impact the price. Additionally, the complexity of the overall septic system design, including the drain field, will affect the total installation cost. Regular septic tank pumping and maintenance is also an ongoing expense homeowners should budget for.