To check if your sump pump is working, slowly pour a bucket of water into the pit. The float should rise, the pump should switch on by itself, pump the water down quickly and shut off. Then go outside and confirm water is coming out of the discharge line well away from the house.
Most of us never think about the sump pump until the night it matters. It sits in a corner of the basement, quiet for weeks, and then a hard rain rolls through Pittsburgh and everything depends on one small motor and a float switch doing their jobs.
September is the right time to give it a few minutes of attention. Summer storms have put it through its paces, the wet fall season is close and leaves will soon be clogging gutters and drains. A simple check now takes less time than a load of laundry and can save you from finding a wet basement floor in October.
How do I test my sump pump?
The bucket test is the easiest way to see if your pump turns on and moves water. Here is how to do it:
- Make sure the pump has power. Confirm it is plugged in and the outlet is working. Many pumps plug into a ground fault outlet, so check that it has not tripped.
- Fill a bucket with water. A large household bucket is usually enough to lift the float in most pits.
- Pour slowly into the pit. Watch the float as the water level rises. It should lift smoothly, without catching on the side of the pit or the pump.
- Listen for the pump to start. When the float reaches its set point, the pump should switch on by itself without any help.
- Watch the water level drop. The pump should lower the water steadily and then shut off once the float drops back down.
- Check outside. Head outdoors and look at the end of the discharge line. You should see water flowing out.
If the pump does not start, starts but does not move water, hums without pumping or keeps running after the pit is empty, it needs attention before the next storm.
What should I look for in the sump pit?
While you are there, take a flashlight and look at the pit itself. Problems here are some of the most common reasons a pump fails when it is needed.
- Debris in the pit. Gravel, silt, leaves or small items can collect at the bottom and clog the pump intake. Clear out what you safely can with the power unplugged.
- A stuck or tangled float. The float needs room to move. If it rubs against the wall of the pit or gets caught on the power cord, the pump may never turn on.
- A pump that has shifted. Vibration can move a pump over time, so it may now sit crooked or press the float against the side.
- Standing water that never drains. Some water in the pit is normal. Water sitting high in the pit with no pump activity is not.
- Rust or heavy buildup on the pump. Corrosion, mineral crust or a sticky film can be signs of age or wear.
- A missing or loose lid. A covered pit keeps debris out and helps hold down basement humidity.
Always unplug the pump before reaching into the pit, and plug it back in when you are done. It sounds obvious, but forgetting to plug it back in is an easy way to lose the protection you just checked.
Is my discharge line doing its job?
A pump that runs perfectly does little good if the water it moves comes right back. The discharge line carries water from the pit out of the house, and it is worth following it from start to finish.
- Check the check valve. Most systems have a valve on the pipe above the pump that keeps water from flowing back into the pit when the pump shuts off. If you hear water rushing back down after each cycle, the valve may not be closing.
- Look for leaks along the pipe. Drips at joints inside the basement add moisture right where you are trying to keep things dry.
- Find where it ends outside. The line should empty far enough from the foundation that the water keeps moving away from the house. If it empties next to the wall, much of that water can soak back toward the basement.
- Clear the outlet. Leaves, grass clippings and soil can block the end of the line. In fall, falling leaves make this more likely.
- Watch for low spots. On a sloped Pittsburgh lot, make sure water from the outlet runs downhill and away, not back toward your house or into a hollow next to the foundation.
Do I need a backup for my sump pump?
It is worth thinking about, especially if your basement has a history of water or holds things you care about. A primary pump can stop working for several reasons: the power goes out during a storm, the motor wears out, the float sticks or the pump simply cannot keep up with a heavy rain.
In general terms, homeowners consider a few kinds of protection:
- A battery backup pump. A second pump that runs on battery power if the main pump loses electricity or fails.
- A secondary pump in the same pit. A second pump set to turn on at a higher water level if the first one cannot keep up.
- A high water alarm. A simple alarm that sounds when water in the pit rises higher than it should, so you know something is wrong before it reaches the floor.
The right choice depends on your home, how often your pump runs and how your basement is used. A qualified plumber or waterproofing contractor can help you decide what fits. If you already have a backup, test it as well, and check the age and condition of any battery.
How often should I check my sump pump?
A good rhythm is a quick check each season and a closer look before the wettest stretches of the year. For most Pittsburgh homeowners, that means early fall and early spring.
It also makes sense to take a look:
- After a big storm. Make sure the pump cycled normally and the discharge outlet is still clear.
- After a power outage. Confirm the pump came back on when the power returned and any ground fault outlet has not tripped.
- When the sound changes. A new rattle, grinding or a pump that runs much longer than it used to can be early warning signs.
- When you notice a damp basement. Musty air, a damp floor near the pit or higher than normal humidity can all point back to the pump.
What do I do if my sump pump fails and the basement gets wet?
First, stay safe. Keep away from standing water if there are any electrical cords, outlets or appliances in or near it, and turn off power to the area if you can do so safely. Then work through these steps:
- Get the water moving out. Restore the pump if the fix is simple, such as a tripped outlet or a stuck float. Otherwise use a wet vacuum or call a qualified professional for water removal.
- Move belongings to a dry area. Boxes, rugs and stored items should come off the wet floor as soon as possible.
- Dry everything quickly. The EPA advises drying wet materials within 24 to 48 hours to help prevent mold growth. Run fans and a dehumidifier until surfaces are dry to the touch.
- Look at porous materials. The EPA notes that porous materials such as carpet and ceiling tiles may have to be thrown away if they become moldy.
- Get the pump repaired or replaced. Do not count on a failed pump to hold up through the next storm.
The EPA notes that water seepage into basements should be stopped quickly so mold will not grow. A working sump pump is one of the main tools many homes rely on to do exactly that.
Sump pumps: myth vs. fact
Myth: If the pump has not run in a while, it must be fine.
Fact: A pump that sits idle can seize, and a float can stick. The bucket test is the only way to know it will start when you need it.
Myth: Once the water leaves the pit, the job is done.
Fact: Water that empties next to the foundation can soak right back toward the basement. Where the discharge line ends matters as much as the pump.
Myth: A little standing water in the pit means the pump is broken.
Fact: Some water in the pit is normal. What matters is that the pump turns on when the float rises and shuts off when the water is down.
Myth: Sump pumps only matter during spring snowmelt.
Fact: Heavy fall rain can put just as much demand on a pump, and leaves can clog discharge outlets right when you need them clear.
Frequently asked questions
How do I know if my sump pump is working?
Pour water into the pit until the float rises. The pump should turn on by itself, lower the water and shut off, and you should see water flowing out of the discharge line outside.
Why does my sump pump run but not pump water?
Common causes include a clogged intake, a blocked discharge line, or a check valve that is stuck. If the pump hums without moving water, unplug it and have it looked at.
Should I cover my sump pit?
A secure lid helps keep debris out of the pit and helps hold down basement humidity. The EPA recommends keeping indoor humidity below 60 percent, ideally between 30 and 50 percent.
What if I see mold after my basement got wet?
For small areas on hard surfaces, the EPA notes that mold covering less than about 10 square feet can usually be handled by the homeowner with detergent and water. Larger areas or growth on drywall and stored items may need professional help.
How Mold Medics Pittsburgh can help
If your sump pump failed during a storm, or your basement has been staying damp around the pit, we start with a free visual mold inspection. Using a thermal imaging camera and a moisture meter, we look for hidden moisture in walls, floors and stored areas, and help you understand whether mold has started where you cannot easily see it. When remediation is needed, our 6 Steps to Victory process (Assess, Contain, Remove, Vacuum with HEPA equipment, Wipe Down and Anti-Microbial Application) handles the affected area, with HEPA air scrubbers running inside containment. If a wet basement has you worried about what moisture left behind, book a free visual mold inspection with Mold Medics Pittsburgh.
