The answer to 'how long does septic tank last' is that a properly maintained septic system can typically last 20-30 years or more. The lifespan of a septic tank depends on several factors, including the size of the tank, the number of people using it, and how well it is maintained.
Septic tanks are designed to last for decades, but they do require regular maintenance and inspections to ensure they continue functioning properly. This includes having the tank pumped every 3-5 years to remove accumulated sludge and scum, and addressing any issues with the drain field or other components as they arise.