What Type Sump?

[homebild]

Is this a sump pump that handles foundation drain water or a sewage sump pump?

If it is the former, it should not be discharging into your sewage system but to clear space outside your basement. You need to contact a plumber to disconnect it and redirect the discharge outside the house.

If it is a sewer ejector type pump, you need to contact a plumber who can check to see if your sewer lines are blocked, your septic tank is filled, or other problems.