Basement Waterproofing · Common problems · Updated November 2026
Sump Pump Runs Constantly or Too Often
A sump pump that runs often during and after heavy rain is doing its job. One that runs nonstop, or cycles every few minutes in dry weather, may have a mechanical problem or be dealing with more water than it was sized for.
Sump pumps are electric and sit in water. Unplug the pump before touching the float or reaching into the pit, and never stand in water near it while it is plugged in.
Common causes
| What you notice | Possible cause |
|---|---|
| Runs without stopping, pit is empty | Stuck float or failed switch |
| Short cycles; water flows back into the pit after it stops | Missing or failed check valve on the discharge pipe |
| Runs often in dry weather | High water table, or water from a leak or irrigation |
| Cannot keep up in heavy rain | Pump undersized or pit too small |
| Discharge water flows right back toward the house | Discharge line too short or frozen |
What you can safely check
- With the pump unplugged, make sure the float moves freely and is not caught on the pit wall or cord.
- Look for a check valve on the discharge pipe just above the pump.
- Follow the discharge line outside; it should release water well away from the house.
- Notice whether lawn irrigation or downspouts are near the foundation.
When to call a pro
Call if the pump runs nonstop, is more than several years old and struggling, or the basement has flooded. Ask about a battery backup pump in case of power outages during storms. Sump pump installation typically runs $1,200–$2,500 (basement waterproofing cost guide).
Cost figures are national ranges from the sources listed in our basement waterproofing cost guide, not a quote from FixFinch or any contractor. This article is general information to help you decide on next steps. It is not an inspection or professional advice; a qualified pro who sees the problem in person can tell you what is actually going on.