If you’re hearing that sump pump alarm sound, it means one of two things. Either the water’s higher than the sump pump’s typical capacity in the room, or water somehow got onto the top of the pump, setting off the sensor and therefore the alarm.
This alarm doesn’t necessarily mean something’s wrong, just that you need to check your sump pump. Like a smoke alarm, a sump pump alarm alerts you to a specific situation. It doesn’t necessarily tell you what you need to do in that situation. While it is up to you to make an informed choice, it is always best to consult with a professional before trying to repair a problem.