Much like anything in life, a septic tank has a lifespan. The average lifespan of a septic tank is 40 years. However, if properly maintained and cleaned, a septic tank rarely reaches the end of its lifespan.
That being said, a septic tank can still be damaged and will need to be replaced or repaired.
Causes of damage in septic tanks can range between:
Plant roots growing through the pipes.
Tank dislodgement.
Pressure from a damaged drain field.
Improper use or care.
Disposing of certain materials in your toilet (things that should not be flushed but rather disposed of in a trashcan).
Misusing your garbage disposal system.