At Custom Septic, we often get asked by our clients the question of how long their septic system will last. Unfortunately, that is not as simple an answer as one may think. In similar fashion, the life expectancy of a septic system is dependent on how it is maintained by its owner. The more regular maintenance performed on your septic system, the greater lifespan for your septic system. When it comes to your septic system maintenance needs, make sure you have your septic system inspected and pumped every 3 years. If fact, most counties and cities require proof that regular maintenance has been completed.