Most well pump failures don't happen without warning — the system usually tells you something's wrong days or weeks before a total outage.
Most likely cause: a waterlogged pressure tank, not the pump itself. See our pressure tank page — this is the single most common cause we find behind this symptom, and it's cheaper to fix than a pump.
Could point to a wearing pump losing efficiency, a partially clogged well screen, sediment buildup, or a well yield issue during a dry stretch. Worth a diagnostic visit before it becomes a full outage.
Often means the pump is losing prime, the well is being drawn down close to the pump intake, or there's an air leak somewhere in the system's suction side (more common on jet pumps than submersibles).
A pump working harder than it should — due to bearing wear, a failing motor, or excessive cycling from a bad tank — draws more power. This is a quieter warning sign than most people expect.
Can mean the pump intake has shifted too close to the bottom of the well, a well screen has degraded, or (after heavy rain) it may be karst-related turbidity rather than a pump problem at all — see our article on that topic.
Usually points to either a pressure switch that isn't sensing correctly, a leak somewhere in the system (including underground between the pump and house), or a well yield that can't keep up with current demand.
Grinding, humming without water output, or a noticeably louder pump than normal often signals bearing wear or motor strain. This is one of the more reliable early indicators that a pump is heading toward failure rather than already failed.
None of these symptoms need to turn into a full outage if caught early. If more than one of these sounds familiar, it's worth scheduling a well inspection rather than waiting to see which one gets worse first.