The answer to 'why is my sump pump making gurgling noise' is that a gurgling sound from your sump pump typically indicates a problem with the pump or the drainage system. This can be caused by a clogged or blocked discharge line, a problem with the check valve, or air getting into the system.
Some common causes of a gurgling sump pump include debris or sediment buildup in the sump pit or discharge line, a faulty check valve that is not allowing water to drain properly, or a problem with the impeller or motor inside the sump pump itself. The gurgling noise is often a sign that the pump is not functioning optimally and may need maintenance or repair.