10 Reasons Your Sump Pump Isn’t Working (And How to Fix It)

There is nothing quite like the sound of a heavy rainstorm hitting the roof to remind you how important a dry basement really is. My mission at PR Farfaras Plumbing has always been simple: I want to provide you with total peace of mind by protecting the home you’ve worked so hard to build. When the clouds turn grey and the downpour starts, you shouldn’t have to worry about whether your basement is going to stay dry. You should be able to relax, knowing your home is safe.

However, the "silent hero" of your home: the sump pump: often goes unnoticed until it stops doing its job. A failing sump pump isn't just a minor inconvenience; it can lead to thousands of dollars in water damage, mold growth, and a whole lot of stress. I’ve spent years helping neighbors throughout our community tackle these issues, and I’ve found that most sump pump failures are actually preventable.

Whether you’re dealing with a sudden puddle or you just want to stay ahead of the next big storm, here are the 10 most common reasons your sump pump might be acting up, along with the honest, professional advice you need to get it back in tip-top shape.

1. The Number One Culprit: Lack of Maintenance

I always tell my clients that a sump pump is a lot like a car; it needs a little love to keep running smoothly. The most common cause of failure I see is simply a lack of regular maintenance. Over time, dirt, gravel, and debris can find their way into the sump pit, clogging the intake or the impeller.

How to Fix It: I recommend testing your pump at least twice a year. It’s easy: just pour a five-gallon bucket of water into the basin. The pump should kick on automatically, move the water out quickly, and shut itself off. While you’re at it, clear out any visible debris from the pit. If you’d rather have a pro look at it, we offer a comprehensive plumbing diagnostic and service to ensure everything is running with the utmost care.

2. A Stuck or Damaged Float Switch

Think of the float switch as the "brain" of the pump. As the water rises, the float lifts, telling the motor to start. If that float gets stuck against the side of the basin or tangled in a stray wire, the pump won’t know it’s time to work. This is especially common with lower-end models that vibrate a lot during operation, causing the pump to shift and the float to pin itself against the wall.

How to Fix It: Open the lid and take a peek. Is the float trapped? Ensure there is plenty of room for the float to move up and down freely. Sometimes, simply repositioning the pump in the center of the pit is all it takes to restore functionality.

3. Clogged Discharge Lines

Your pump can be working perfectly, but if the water has nowhere to go, it’s going to end up right back in your basement. Discharge lines can become blocked by dirt, rocks, or even small rodents that decide to make a home in the pipe. When the line is clogged, the pump has to work twice as hard, which can lead to a burnt-out motor.

How to Fix It: Check the exit point of your discharge pipe: usually located outside your home: to make sure it’s clear of leaves and mulch. If you suspect a "stubborn clog" deeper in the line, it might be time to call in the experts. We use proven techniques to clear these lines and ensure your system provides a lasting solution for water removal.

4. Power Failure and Electrical Issues

It sounds obvious, but you’d be surprised how often a "broken" pump is just a pump without power. Since sump pumps usually work during storms, power outages are a major threat. Additionally, sump pumps should always be plugged into a dedicated GFCI outlet. If that outlet trips due to a ground fault or moisture, your pump is essentially a paperweight.

How to Fix It: First, check your circuit breaker and the GFCI reset button. To truly protect your home, I highly recommend installing a battery backup system. This ensures that even if the neighborhood goes dark, your basement stays dry. It’s a dedicated, reliable, and professional way to gain that extra layer of security.

5. Motor Burnout

If your pump is constantly running: perhaps because it’s too small or the check valve is broken: the motor will eventually give out. I often see this in homes where the pump was "the cheapest option" at the big-box store. Those motors aren't designed for heavy-duty, continuous use.

How to Fix It: If the motor is humming but not moving water, or if it’s making a grinding noise, it’s likely reaching the end of its life. At PR Farfaras Plumbing, we provide high-quality collaboration to help you choose a pump with the power and durability your home requires. You can see some of our recent installations in our gallery.

6. The Pump Is the Wrong Size

Sizing matters. If your pump is too small, it won’t be able to keep up during a flash flood. If it’s too big, it will "short-cycle," meaning it turns on and off too frequently. This rapid cycling wears out the motor and the switch much faster than normal.

How to Fix It: Finding the "Goldilocks" pump: one that is just right: requires calculating the volume of water entering your basin. We specialize in these types of assessments to ensure you get an efficient, stylish upgrade that fits your home's specific needs.

7. A Missing or Broken Check Valve

The check valve is a small but vital component in the discharge line. Its job is to make sure that once water is pumped out, it doesn't flow right back down into the pit when the pump shuts off. Without a working check valve, your pump will keep pumping the same few gallons of water over and over again.

How to Fix It: Listen to your pump. If you hear a loud "thud" when it turns off, or if you see water rushing back into the pit immediately, your check valve likely needs replacing. This is a quick and affordable fix that can save your motor from early retirement.

8. Frozen Discharge Pipes

In our climate, the winter months bring a unique set of challenges. If the water in your discharge pipe freezes, it creates an ice plug that is impossible for the pump to push through. This is a common cause of mid-winter basement flooding during a thaw.

How to Fix It: Ensure your discharge pipe is sloped downward so water can't pool and freeze. You can also install a specialized "ice guard" or grated discharge attachment that allows water to escape near the foundation if the main line is frozen further down. It’s a simple way to deliver protection all year round.

9. Improper Installation

Sometimes the issue isn't the pump: it’s how it was put in. I’ve seen pumps installed without a proper basin, discharge lines that are too narrow, and even pumps that aren't sitting level. A DIY job can save money upfront, but an improper installation can lead to a disastrous failure when you need the pump most.

How to Fix It: If you’re unsure about your current setup, it’s worth having a trusted local expert take a look. We pride ourselves on providing seamless, professional installations that meet all local codes and safety standards.

10. Old Age

Nothing lasts forever. On average, a well-maintained sump pump will last about 7 to 10 years. If your pump is pushing a decade, it’s living on borrowed time. I’d much rather help you replace an old pump on a sunny Tuesday than come out for an emergency repair in the middle of a midnight thunderstorm.

How to Fix It: Check the manufacture date on your pump. If it’s getting up there in years, book an appointment with us for a replacement. We focus on providing lasting, high-quality units that offer the peace of mind you deserve.

Protecting Your Home, One Pump at a Time

At PR Farfaras Plumbing, we aren't just a commercial entity; we’re your neighbors. We understand that your home is your sanctuary, and we’re dedicated to keeping it that way. Whether you need a simple check valve replacement or a full battery backup system installation, we tackle every job with the same level of integrity and care.

Don’t wait for the water to start rising to think about your sump pump. Take a moment today to check your system, and if something doesn't seem right, reach out to us. We’re here to provide honest advice and exceptional assistance to ensure your basement stays dry, no matter what the weather has in store.

Ready for a dry basement?

• Quickly: We respond fast to your needs.

• Affordably: We provide transparent pricing.

• Utmost Care: We treat your home like our own.

If you have questions or want to schedule a visit, feel free to contact us today. Let's work together to keep your home safe and sound. For more tips on maintaining your home’s health, check out our full blog here.