Common signs your sump pump needs attention include unusual grinding or rattling noises, the pump running continuously even during dry weather, the pump not activating during heavy rain, visible rust or corrosion on the unit, or a musty smell coming from the pit. If your sump pump is over 7–10 years old and showing any of these signs, replacement is usually more cost-effective than repeated repairs. Flow Plumbing Ajax inspects your system on-site and gives you an honest assessment before recommending any work.