Question: how much does it cost to install a 1000 gallon septic tank?
Answer: For a septic tank under 1,000 gallons, the tank itself will likely cost between $600 and $1,000, according to HomeAdvisor, while a tank that's 1,200 gallons or more is more likely to cost $1,200 to $1,600. The amount of time it takes to install a septic tank varies based on the weather, type of soil and other factors.