How Many Years Is A Septic System Good For?

Septic systems play a critical role in wastewater treatment and management, so it’s crucial to know how long yours is going to last. There are several factors that contribute to the overall lifespan of a septic system. By considering the following, you can get a general idea of when your system might need to be replaced.

How old is your current septic system?

The age of your current septic tank plays a key role in determining its life expectancy. Systems installed prior to 1987 used different materials which aren’t as durable as those made starting from the late 1980s.

How well was it constructed?

Even if your tank was built using high-quality materials, improper construction can hasten its failure. This includes poor plumbing, poor workmanship, and a lack of efficient drainage.

How big is your household?

Septic SystemThe more people you have in the house, the faster your septic tank will fill up. A clogged system doesn’t only reduce efficiency; it also increases the risk of break-down.

How far is your tank from the drainfield?

Proper distribution between tanks and drainfields is necessary to maintain the smooth operation of a septic system. If there are too many solids inside the tank without enough liquid, they won’t make it to the soakaway bed.

How’s your plumbing?

Septic systems rely on gravity to work properly. Those with defective or poorly designed piping may limit proper flow which can aggravate issues like slow draining and bad smells.

How often do you use your septic system?

The more you use your system, the faster it will fill up and require pumping. Septic tanks should only be used for human waste and toilet paper – nothing else!

If you’re still unsure about how long your septic tank is going to last, consider getting a professional inspection. This can help identify any potential problems and give you a better estimate on when it will need to be replaced.


Considering all these factors, the general lifespan for a septic tank system is around 20-25 years. However, this number can vary depending on the condition of the existing system and how well it’s been taken care of. So if you’re nearing that 25-year mark, it may be time for a replacement!

Call in the professionals

If you are looking for help and advice on your septic system, the professionals at Eco-Septic are here to help.

Eco-Septic is a Sydney based manufacturer and specialises in commercial wastewater systems of various shapes and designs. We can provide fast and free quotes relevant to your commercial wastewater needs, all while keeping in mind individual spending capabilities.

Contact us today for a fast quote at 1800 808 135 or visit us at