Septic systems that cannot achieve gravity from the septic tank to the leach require a pump chamber.
These pump chambers hold an effluent pump that then pumps the effluent to the leach field.
Like any other mechanical device pumps can have issues or they could just be at the end of their lifespan.
There should be an alarm panel inside or outside of your home that will sound if there is an issue.
If this occurs please call Mt. Everett immediately so we can trouble shoot and get the issue sorted out.