If your O’Fallon home has a basement, you almost certainly have a sump pump. If you can’t remember the last time you tested it, now — April, before the heavy storms really start — is the right moment to spend 15 minutes doing the checks below. The difference between a working sump pump during a three-inch storm and a failed one is often the difference between a dry basement and a five-figure insurance claim.

Why Sump Pumps Fail at Exactly the Wrong Time

Sump pumps don’t die slowly. They mostly sit still for months at a time, then get asked to run continuously for hours during a single storm event, and the failures usually happen at peak load — right when you need them most. The common failure modes we respond to in O’Fallon during and after storms:

• Stuck float switch. The float is the little ball or paddle that rises with the water level and tells the pump when to kick on. Over years of sitting in a pit, it can get tangled on the pit wall, the discharge pipe, or debris that’s fallen in. A stuck float means the pump never runs, even as water rises around it.
• Burned-out motor. Typical sump pump motors last 7-10 years with normal use. Ones in a wetter-than-average location (lots of homes in certain O’Fallon subdivisions with high water tables) can wear out in 5-6.
• Clogged check valve. The check valve sits just above the pump and stops water from flowing back down the discharge line when the pump shuts off. If it clogs or fails, the pump keeps cycling on the same water over and over, overheating the motor.
• Power failure during the storm. The same storm that’s dumping water into your pit is also the one most likely to knock out your electricity. If you don’t have a battery backup, your sump pump goes down with the grid.
• Frozen discharge line. Less of an issue in April, but worth knowing: a discharge line that runs too shallow can freeze shut over winter and leave the pump unable to push water out until a thaw.

The 15-Minute Sump Pump Check You Should Run Right Now

None of these steps require special tools. Any homeowner can do them in a single morning. Doing them in April — before the first real spring storm — is the point of this whole article.

1. Open the sump pit lid and look. You’re checking for debris that’s fallen in (leaves, drywall chunks, kid’s toys), standing water more than a few inches deep for no obvious reason, and any visible damage to the pump housing or the float.
2. Test the pump by pouring water. Fill a 5-gallon bucket with water and pour it slowly into the pit. The pump should kick on when the water level rises to the float’s activation point, pump the water out, and shut off cleanly. If any of those three stages fail, you have a problem.
3. Listen to the motor. A healthy sump pump runs with a steady, moderate hum. A sick one sounds grinding, rattling, labored, or high-pitched. Trust your ears — if it sounds wrong, it probably is.
4. Check the discharge pipe outside. Walk around the house and find where the sump line exits your home. It should be clear of mulch and dirt, not clogged at the end, and angled away from your foundation so the water it pumps out doesn’t just run back in.
5. Verify the check valve. After the pump shuts off, you should hear a single clunk as the check valve closes. You should NOT hear water continuing to trickle back down into the pit for several seconds — that’s a failed check valve.
6. Check the battery backup (if you have one). Most backup batteries have a test button. Press it. If the unit doesn’t activate, the battery is toast — and most backup batteries need replacement every 3-5 years regardless of how much they’ve been used.

“Replacement of sump pump. Robbie is timely, knowledgeable and professional. I have used this company for a number of years for plumbing, heating, A/C and electrical services. Top notch!”
— Debbie P., O’Fallon, MO

When Spring Replacement Beats “Wait and See”

If your sump pump is more than 7 years old, has ever made a sound you didn’t like, or failed any part of the 15-minute check above, spring is the right window to replace it — not after the first storm. Replacement on a scheduled basis, in daylight, with time to pick the right unit, is vastly different from a 10 p.m. emergency call with water already rising.

A proper replacement call from our O’Fallon plumbing team runs through a few decisions with you: whether a 1/3 HP or 1/2 HP pump matches your pit’s demand, whether you want a cast-iron body (longer life, higher cost) or a thermoplastic body (shorter life, lower cost), whether to add or upgrade a battery backup, and whether the existing discharge line and check value are worth reusing or should be replaced at the same time.

While the plumber is there, it’s also worth asking them to look at any basement-adjacent leaky pipes or slow water leaks you’ve been putting off. A 30-minute add-on during an existing service call is almost always cheaper than a separate trip later.

“Called on Thursday and Robbie came out to look at our old basement water sump pump set up. Overnight the system started alarming and Robbie came out the next afternoon to replace the system. He was on time and very professional.”
— Jennifer W., Cottleville, MO

For Service Club Members: This Check Is Included

If you’re a Service Club Member , a sump pump inspection is folded into your annual plumbing visit at no extra charge — just mention it when we schedule. It’s one of the most valuable 10 minutes of the whole visit.

Schedule a Spring Sump Pump Check in O’Fallon

If you’d rather not climb into the basement yourself, or if anything in the 15-minute check looked off, call our plumbing team at (636) 397-3200 or request service online. Same-week appointments are typically available throughout O’Fallon , St. Charles, St. Peters, and Lake St. Louis. For more on how to keep your plumbing system healthy year-round, our O’Fallon plumbing maintenance guide covers the bigger picture.