What to Do If Your Sump Pump Fails After a Storm

Start with safety

Follow official local alerts and wait until conditions are safe before approaching the area. Do not enter standing water. If water is rising, an evacuation or other official warning applies, you see sparks or hear buzzing, smell gas, the building appears unstable, or sewage or contaminated water is present, leave the area and follow official directions instead of continuing to check.

What not to do

• Do not enter standing or floodwater to reach or inspect a sump pump.
• Do not touch wet electrical equipment, outlets, panels, appliances, or cords.
• Do not open, repair, manipulate, switch, reset, or test electrical equipment or the pump.
• Do not move items through water or continue checking after a leave-area trigger appears.

When to call for qualified help

Contact a qualified plumber, qualified electrician, utility, or emergency service when water is rising, electrical hazards exist, sewage or contamination is present, or the pump will not operate. If anyone is in immediate danger, contact local emergency services. Do not wait for property damage to worsen before asking for help.

A simple ground-level check

Only from a dry, safe location, observe the situation without trying to reach the pump or electrical equipment:

1. Observe whether water is rising and whether official local alerts or directions change.
2. Observe only; do not open, repair, manipulate, switch, reset, or test electrical equipment or the pump.
3. Move valuables only from dry, reachable areas.
4. Stop checking and leave if any water, electrical, gas, sewage, structural, or official-alert danger appears.

Why sump pumps fail during storms

A storm is the moment a sump pump works hardest, so it is also when small problems show up. The usual causes are:

• Power outage: most sump pumps run on household power, and storms that bring heavy rain often knock that power out.
• More water than the pump can move: a pump that keeps up with normal rain can fall behind in a long downpour or snowmelt.
• Stuck float switch: the float that turns the pump on can catch on the pit wall, the cord, or debris.
• Clogged intake or check valve: silt, gravel, and debris in the pit can block water from moving through the pump.
• Frozen or blocked discharge line: in winter, a discharge line that freezes or is buried in snow leaves the water nowhere to go.
• Age and wear: an older pump that has never been tested may fail on the first big storm of the season.

Knowing the likely cause helps you describe the problem to a qualified plumber or electrician. It is not a reason to open, reset, or test the pump yourself while water or electrical hazards are present.

If the power is out

A power outage is the most common reason a sump pump stops during a storm. Stay out of standing water and away from wet electrical equipment, report the outage to your utility, and follow its updates.

• Never run a generator indoors, in a basement, in a garage, or near open windows. Keep it outside, at least 20 feet from windows, to avoid carbon monoxide poisoning.
• Do not run extension cords through water or plug anything into an outlet in a wet area.
• If the basement is already taking on water, observe only from a dry, safe location and move valuables only from dry, reachable areas.
• If water is rising, sewage is present, or electrical hazards exist, contact a qualified plumber, qualified electrician, utility, or emergency service.

For outage prep before the next storm, print the Storm Power Outage Home Checklist PDF or browse the full printable checklist library. If a winter storm takes the power out, the sump is only one worry; see winter power outage home prep for keeping pipes from freezing with the furnace off and running a generator safely, and how to prevent frozen pipes for the pipe checklist.

After the water goes down

1. Wait for official local alerts and your utility to say it is safe before going back into a basement that took on water.
2. Have a qualified electrician check any electrical equipment, outlets, or panels that got wet before anyone uses them.
3. Have a qualified plumber inspect the pump, the float switch, the check valve, and the discharge line before the next storm.
4. Take photos of water levels and damage for your records and any insurance claim before you clean up.
5. If sewage or contaminated water entered the home, use a professional cleanup service rather than cleaning it yourself.

Before the next storm: a sump readiness check

The best time to find a sump pump problem is on a dry day, not in the middle of a storm. When the basement is dry and conditions are safe:

• Test the pump the way its manufacturer describes, usually by slowly adding water to the pit and watching it turn on and off.
• Check the discharge line outside. It should be clear, drain away from the foundation, and not be buried in snow or frozen in winter.
• Keep the pit clear of debris, and keep stored items away from the pump and its cord.
• Clear gutters and downspouts so less water reaches the foundation in the first place.
• Plan for outages. If your basement floods when the power goes out, ask a qualified plumber whether a battery backup pump or a high-water alarm makes sense for your home.

For the full before-the-storm list, see heavy rain home prep or print the Heavy Rain Home Checklist PDF. Winter storms bring their own sump risks, like frozen discharge lines and snowmelt; see the winter storm home prep guide. In Buffalo and Western New York, where thaws and rain often follow lake-effect snow, the Buffalo winter checklist puts the sump check in its seasonal order.

What HomeGuard can and cannot do

HomeGuard Weather is a pre-launch iPhone app designed around forecast-based home-care checklists. It can support preparation before weather arrives. It cannot detect a sump-pump failure, prevent flooding, replace official alerts or emergency services, provide emergency instructions, or diagnose or repair a home.

Sources and further reading

This guide follows the safety boundaries in Ready.gov flood guidance, the National Weather Service During a Flood guidance, the National Weather Service After a Flood guidance, and the American Red Cross power outage safety guidance.

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