Sump Pump Maintenance Checklist: What to Check Before Storm Season
Sump Pump Maintenance Checklist. A sump pump is one of those devices that works silently in the background for years, right up until the one moment you actually need it during a heavy storm, and then you discover it's failed. Because sump pumps typically only run occasionally, problems can go unnoticed for a long time. A quick seasonal check, ideally before spring rains and again before winter, is the best way to make sure yours will work when it matters.
Step 1: Check the Power Connection
Confirm the pump is plugged directly into a grounded outlet, not through an extension cord, and that the outlet is working. Sump pump circuits are often on a dedicated GFCI outlet, and those can trip without an obvious sign. Press the test and reset buttons on the outlet to confirm it's functioning.
Step 2: Test the Float Switch
The float switch tells the pump when to turn on as water rises in the sump pit. Slowly pour a few gallons of water into the pit until the float rises enough to trigger the pump. It should activate promptly, pump the water out, and shut off cleanly once the level drops. If it hesitates, sticks, or doesn't trigger at all, the float mechanism may be obstructed or failing.
Step 3: Clean the Pit and Inlet Screen
Sediment, gravel, and debris naturally settle at the bottom of a sump pit over time and can be drawn into the pump's inlet screen, restricting flow or causing the motor to strain. Unplug the pump, remove it from the pit, and clear away any debris from both the pit itself and the intake screen on the pump.
Step 4: Inspect the Discharge Line
Follow the discharge pipe from the pump to where it exits the house. Check for kinks, blockages, or ice buildup in the line (a particular risk in winter, since a frozen discharge line has nowhere for pumped water to go and can force it back into the pit or trip the pump's overload protection). Make sure the discharge point outside directs water well away from the foundation, not right back toward it.
Step 5: Check for a Check Valve
A check valve on the discharge line prevents water that's already been pumped out from flowing back down into the pit once the pump shuts off. If yours is missing or has failed, the pump has to work harder and cycles more frequently than necessary, shortening its lifespan. Check valves are inexpensive and straightforward to install on the vertical section of discharge pipe near the pump.
Step 6: Consider a Battery Backup
Sump pumps are needed most during major storms, which are also exactly when power outages are most likely. A battery backup system (or a fully separate battery-powered backup pump) keeps your basement protected even if the power goes out mid-storm. If you don't already have one and live in an area prone to basement flooding, this is one of the more worthwhile plumbing investments you can make.
Step 7: Listen for Unusual Noises
A healthy sump pump runs with a fairly consistent hum. Grinding, rattling, or unusually loud operation can indicate a failing bearing or impeller damage, often from debris that got past the intake screen. Catching this early, before a full failure, gives you time to schedule a repair rather than facing an emergency during the next storm.
How Often to Do This
- Test the float switch and clean the pit every 3-4 months.
- Do a full inspection, including the discharge line and check valve, twice a year — once before spring storms and once before winter freeze risk.
- Replace the pump proactively if it's more than 7-10 years old, even if it still seems to work, since failure often comes without warning.
If your sump pump fails a test, or if you notice water intrusion in your basement despite having a pump installed, contact a plumber promptly rather than waiting for the next storm to find out for certain.