Originally Posted By: ckratzer
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This sounds like it’s being used as a lift station.Lift stations are commonly used if the elevation of the latteral field and septic tank are higher than the elevation of the waste water outlet.
Are you saying the sump pit is sealed from any water intrusion other than household drains? If this is what you are saying I bet the above mentioned is what the pump is doing.
Just a guess without actually seeing the system.