Why Does a Sump Pump Stop Working During a Storm?
Last updated October 25, 2026
The short answer
Power Outages and Electrical Issues
The most common reason a sump pump stops during a storm is a power outage. When the electricity goes out, the pump has no power to run. Even if the power stays on, a tripped circuit breaker or a blown fuse can cut power to the pump. Check your electrical panel for any tripped breakers and reset them if needed.
Another electrical issue is a faulty float switch or a wiring problem. The float switch tells the pump when to turn on and off. If it gets stuck or breaks, the pump may not activate. Also, a loose connection or a damaged cord can stop the pump. If you are not comfortable working with electricity, have an electrician inspect the system.
Float Switch Problems
The float switch is a small device that rises and falls with the water level. When it rises, it turns the pump on. When it falls, it turns the pump off. During a storm, the float can get tangled or stuck against the side of the sump pit. Debris like leaves or dirt can also jam the float, preventing it from moving freely.
If the float is stuck in the off position, the pump will not run even if water is rising. Sometimes the float can be adjusted or freed by gently moving it. But if the float is broken, it needs to be replaced. This is a job that the pros often handle, as they have the right tools and parts.
- Check the float for tangles or debris
- Gently move the float to see if it frees up
- Listen for the pump clicking on and off
- If the float is damaged, replace it
- Keep the sump pit clear of debris
Clogged Pump or Discharge Line
Debris in the sump pit can clog the pump's intake or the discharge pipe. During a storm, runoff can carry dirt, leaves, and small stones into the pit. If these block the pump, it cannot move water out. The pump may run but push little or no water, or it may overheat and shut off.
The discharge line, which carries water away from your home, can also become blocked. A kink in the hose or a blockage at the outlet can stop the flow. Inspect the discharge line for any bends or obstructions. If the pump is clogged, you may need to clean it out, but be careful with the pump's internal parts.
Overwhelmed by Water Volume
Sometimes the pump is working fine, but the storm brings more water than it can handle. Heavy rain can fill the sump pit faster than the pump can empty it. If the pump's capacity is too small for the amount of water, it will run continuously but still not keep up. This can lead to the pump overheating and shutting off temporarily.
In this situation, you might need a larger pump or a second pump to handle the volume. A backup pump can be installed to take over if the primary one fails. The pros can assess your sump pump setup and recommend the right solution for your home's needs.
- Check the pump's capacity against your needs
- Consider a backup pump for high-water events
- Clean the sump pit before a storm
- Test your pump regularly
- Have a plumber or pro inspect the system
What to Do When Your Pump Fails
If your sump pump stops working during a storm, act quickly to prevent water damage. First, check the power and the float switch as described above. If you cannot fix the problem, remove standing water using a wet vacuum or buckets if it is safe. Move valuables to higher ground and protect floors with towels or plastic.
After the storm, call the pros to inspect your sump pump and any water damage. They can repair or replace the pump and help dry out your basement. If you live in Long Island, keep your shutoff valve location written down. Also, review your insurance policy to see if sump pump failure is covered. Policies vary, and your insurer decides what is covered.
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Call Now (516) 475-5895Frequently asked questions
Can I fix a sump pump myself?
You can try simple fixes like resetting a breaker or freeing a stuck float. But if you need to open the pump or work with wiring, call a professional. Water and electricity are dangerous, so safety comes first.
How often should I test my sump pump?
Test it every few months by pouring water into the pit and watching it cycle. Do this before storm season to catch problems early. Regular testing helps you avoid surprises during a storm.
Will my insurance cover sump pump failure?
Coverage depends on your policy. Some policies cover water damage from sump pump failure, but not always. Check your policy documents and ask your insurer about specific coverage. Policies vary, and your insurer decides what is covered.