Leave the unknown up to the guys that know!
Septic inspections are crucial to keeping a septic system maintained because they ensure that you get the most life out of your system. Neglected septic systems fail up to twice as soon as ones that are properly cared for. Septic inspections are not as simple as taking a look down into a septic tank. It is a multiple step process that measures tank structure, hydraulic testing, and drainfield absorption rate. Not every septic system is the same size. They greatly vary depending on house size and soil types.
Septic systems have a wide variance when looking at their lifespans. Every property has different soil types, and this can make a significant difference in the lifespan of a system. The size of drainfields are usually larger for properties with bad soils because they drain slower. Some septic systems have good soils. This means they usually have smaller drainfields. This is because good soils drain faster.
What defines “good soils” and “bad soils”. See our page on percolation tests.
Septic systems greatly vary and have many unknown factors. This is why you should always hire a certified septic inspector to conduct septic inspections. While septic inspections are most common during real estate transactions, they should occasionally be conducted on every system, regardless.