Is it normal for my sump pump to run so often? If not, who should I call?
looks like you have a hole in your pit liner. but its doing its job  its still removing water from under the foundation as it should. however i advise you to call a reputable drain inspection service to do a video inspection of the footing drain those are the two pipes you see entering the pit. if water is leaking into the pit from a hole in the plastic liner it should also be coming into  it from the two pipes that enter the pit.