Sump pump not working? Basement flooding during storms? Express Plumbing repairs and installs sump pumps across Lake Saint Louis, Wentzville, O'Fallon, and St Charles County. Battery backup systems available. Licensed master plumber with 26 years experience. Call (314) 807-8460 — don't wait until the next storm.

If you've got a basement in Lake Saint Louis, Wentzville, O'Fallon, or anywhere around here, you probably have a sump pump. It sits in a pit in your basement floor and pumps water out when it rises. When it's working, you don't think about it. When it fails during a heavy rain, you've got a flooded basement and you're dealing with a mess that'll take days to clean up. Sump pumps fail for a few reasons. Sometimes the float switch gets stuck and the pump doesn't turn on. Sometimes the pump itself burns out. Sometimes the discharge pipe freezes in winter and water can't get out. Sometimes the pit fills with debris and clogs the pump.
We've been fixing and installing sump pumps across Lake Saint Louis and surrounding areas since 1999. Most repairs are straightforward — replace a bad float switch, clean out the pit, fix a clogged discharge line. If the pump itself is dead, replacement usually makes more sense than trying to repair it. Most sump pump replacements take a couple hours. We pull the old pump, install the new one, test it, and you're done. We also install battery backup systems so your pump keeps running even if the power goes out during a storm. That's when you need it most.
We Diagnose the Problem or Assess Your Setup
When you call (314) 807-8460, we'll ask what's happening — is the pump not running, is it running constantly, is your basement flooding? We come out, look at the pump and the pit, and figure out what's wrong. If it's repairable, we'll tell you what needs fixed and what it'll cost. If the pump's dead or too old to be worth fixing, we'll recommend replacement and give you a price.
We Fix or Replace the Sump Pump
For repairs, we might replace a float switch, clean out the pit, fix a clogged discharge line, or clear a frozen pipe. For replacements, we disconnect the old pump, pull it out, install the new pump, connect the discharge line, and make sure everything's secure. If you're adding a battery backup, we install that too. Most repairs take an hour or two. Most replacements take two to three hours.
We Test It and Make Sure It's Working
Once the repair or install is done, we test the pump. We pour water into the pit and make sure the pump kicks on at the right level and pumps the water out properly. We check the discharge line to make sure water's flowing where it should. For battery backups, we test that the backup system kicks in when it's supposed to. Once we're confident everything's working right, we clean up and we're done.
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Most sump pump replacements run $400–$800 depending on the pump and how complicated the install is. If it's a straightforward swap and everything's in good shape, it's on the lower end. If we need to modify the pit, replace the discharge line, or deal with other issues, it'll be closer to $800. Battery backup systems add $500–$1,000 depending on the system.
Most sump pumps last 7–10 years depending on how often they run and how well they're maintained. If you live in an area that gets a lot of water and your pump runs frequently, it might not last the full 10 years. If your pump sits idle most of the time, it might last longer. Once it's over 10 years old and having problems, replacement is usually the better choice.
If your basement floods when the power goes out, yes. Battery backups keep your pump running during power outages, which is usually when you need it most. Heavy storms knock out power and that's exactly when your sump pump needs to be working. A battery backup system is worth it if you've got anything valuable in your basement or if you've dealt with flooding before.
Test it. Pour a bucket of water into the sump pit and watch what happens. The pump should kick on when the water reaches a certain level and pump the water out. If it doesn't turn on, or if it turns on but doesn't pump water out, something's wrong. Test it once or twice a year, especially before storm season.
Either the float switch is stuck in the "on" position, or water's coming in faster than the pump can handle. Sometimes the discharge line is clogged or frozen and water's not getting out, so the pump keeps running but the pit doesn't empty. We'll diagnose what's causing it and fix it. A pump that runs constantly will burn out fast.
You can reach us at (314) 807-8460 or email us at [email protected] for more information — we’re always happy to help.