If your home relies on a sump pump, check its condition before heavy rain rather than waiting for water in the basement. A working pump is one part of the home's drainage system, not a guarantee against flooding.
Follow the maintenance and testing instructions for your particular pump and any backup system. If you are unsure what equipment you have or how to test it safely, have a plumber check it.
Check the system before periods of heavy rain and at the intervals specified by its manufacturer. Leave time to address a problem before the pump is needed.
How a Sump Pump Works
Your sump pump sits in a pit (the sump basin) at the lowest point of your basement or crawl space. When groundwater rises and fills the pit to a certain level, a float switch triggers the pump to kick on and discharge the water away from your foundation through a drain line.
Residential sump-pump systems differ in design, controls and backup equipment. Identify your model and use its instructions rather than assuming one maintenance procedure applies to every installation.
This checklist is for a groundwater sump system, not a sewage ejector. If the basin is sealed or you are unsure what the system is, do not open it; ask a plumber.
Stay out of standing water near electrical equipment. Do not handle wet plugs, outlets or controls, and contact a qualified electrician if electrical equipment is wet or the area is flooded.
Keep hands, tools and clothing out of an energized basin. Before any hands-on inspection or cleaning, all power sources, including battery backup where fitted, must be disconnected according to the manufacturer's instructions. Leave that work to a qualified professional if you are unsure.
Step-by-Step: How to Test Your Sump Pump
Step 1 Find the sump pit
Locate the basin and identify the pump and any backup equipment from an accessible, dry location. Do not remove a sealed cover or reach inside; use the manufacturer's instructions to determine whether any homeowner inspection is appropriate.
Step 2 Check the power
From a dry, safe position, look for normal power or status indicators specified in the manual. Do not handle wet electrical components, bypass a protective device or repeatedly reset a tripping breaker.
Step 3 Follow the Manufacturer's Test Procedure
Use a water test only if the manufacturer describes it as an appropriate homeowner procedure and the area is dry and safe. Follow the specified access and water-level instructions; keep hands and tools out of the basin while the pump is energized.
Observe whether the pump starts, discharges water and stops as described in the manual. Stop the test and arrange service if it does not; do not keep adding water or force the float.
Step 4 Check the discharge line
From a safe location, check the accessible discharge route for obvious damage or blockage. The outlet arrangement must suit the property and applicable local requirements, not a single distance that fits every home.
Ask a plumber about water returning toward the foundation or an outlet that creates pooling, icing or drainage problems.
Step 5 Inspect the float switch
The float switch controls when the pump turns on and off. Do not reach into the pit or handle the float while the system is energized. Before any hands-on inspection, all power sources, including battery backup where fitted, must be disconnected according to the manufacturer's instructions. If the area is flooded or electrical equipment is wet, stay clear and contact a qualified electrician. Ask a plumber to inspect a stuck or obstructed float rather than forcing it.
Step 6 Clean out the pit
If debris is visible or cleaning is due, follow the manufacturer's maintenance instructions. Do not reach into the basin just because the primary pump is unplugged; backup power and other equipment must also be safely isolated before hands-on work.
Have a qualified professional clean or service the system if access, isolation or reassembly is uncertain. Any covers and protective components must be restored before operation.
- System and backup equipment identified
- Manufacturer's testing and maintenance instructions available
- No standing-water or wet-electrical hazard
- Appropriate functional test completed without reaching into the energized basin
- Accessible discharge route checked for visible problems
- Debris or maintenance concerns referred for safe servicing
- Backup protection and its maintenance requirements reviewed
Warning Signs Your Sump Pump Needs Assessment
A basic test does not establish that the whole drainage system is ready for every storm. These concerns call for assessment to determine whether maintenance, repair, replacement or another drainage change is needed.
- Age and service history: Review the manufacturer's guidance and the pump's condition, use and repair history. Age can be a reason to plan ahead, but it is not a universal replacement deadline.
- Runs constantly or cycles on and off rapidly. This usually means the float switch is stuck, the pump is undersized for your pit, or there's a plumbing issue causing water to recirculate.
- Visible rust or corrosion. Have significant corrosion or deteriorated connections assessed. Appearance alone does not establish the condition of the internal components.
- Unusual noises. A grinding or rattling sound during operation typically means the impeller (the part that moves water) is damaged or debris is caught in the intake.
- It ran dry for an extended period. Sump pumps can burn out if they run without water — this sometimes happens if a float switch sticks in the "on" position during a dry spell.
- You had basement water last season. If your basement took on water during a storm even with the pump running, the pump is undersized, failing, or your drainage system has another issue.
Should You Have a Backup Sump Pump?
Kansas City storms don't wait for convenient timing. One of the most common scenarios we see is a power outage during a heavy storm — the exact moment your sump pump needs to be working. A battery backup sump pump sits in the same pit as your primary pump and kicks in automatically when the power goes out or when the primary pump can't keep up.
If you have finished living space or valuable belongings in the basement, discuss backup protection with a plumber. Compare the system's capacity, maintenance needs and limitations with the risk you are trying to reduce; a backup is not a guarantee against flooding.
A pump is only one part of keeping water away from the basement. If water problems persist, have the discharge arrangement and the property's drainage assessed instead of assuming a larger or newer pump will solve everything.
When to Call a Plumber
Arrange service if the pump fails its recommended test, runs abnormally, makes unusual noises or shows significant corrosion. Have the cause assessed before deciding whether repair, replacement or another drainage change is needed.
At Poor John's, we install and service sump pumps across the Kansas City metro — both Missouri and Kansas. We'll tell you upfront what it costs before we start, and we won't upsell you to a system bigger than you need.
Sump Pump Not Working?
Don't wait for the next storm. We service and replace sump pumps across Kansas City with flat-rate pricing — you'll know the cost before we start.
The Bottom Line
Check your sump-pump system before heavy rain and follow the manufacturer's maintenance schedule. A safe test can reveal a problem early, but it does not guarantee protection against every storm.
If something does not work as expected, arrange an assessment rather than forcing the equipment or assuming the entire pump must be replaced.