Sump Pump Installation in St. Louis, MO
A sump pump catches water gathering beneath a basement slab and lifts it outdoors before it spreads across the floor. Through this free referral service, homeowners in St. Louis, Missouri are put in touch with one independent local contractor, who visits and writes up pump choices with prices.
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Replacing an Old Sump Pump
Every setup has four pieces. The pit is a basin set into the floor at a low point, usually where interior drain pipe ends. The pump sits inside and starts when a float rises. A discharge pipe carries the water outside, and a check valve on it keeps each load from sliding back when the motor stops.
Plenty of St. Louis basements already have a pit. The typical home in the City was built around 1938 (Census survey), so a replacement often means sorting out what an earlier owner left: a basin with no lid, a sticky valve or a line with no clear end.
That end point is worth asking about first. In the City and the older inner suburbs, rain and wastewater share one set of pipes, and the Metropolitan St. Louis Sewer District (MSD) says many buildings still send gutters, sump pumps and yard drains into that sewer. In some project areas MSD disconnects those lines at no cost to the owner. A new discharge should end outdoors, away from the wall, and never join the sewer unless the contractor has confirmed your address allows it.
Backup power deserves a line too. Spring storms and summer downpours can bring outages, and April 2025 was the wettest April on record in St. Louis, with more than 10 inches (St. Louis Public Radio). A battery pump and a high-water alarm add a second layer.
Common Situations
- A basement with no pit. A new basin cut into the slab, often fed by drain pipe along the wet walls.
- A pump near the end. One that hums, short-cycles or seizes, swapped for a unit sized to the pit.
- A missing check valve. Without it, water falls back down the pipe and the pump moves the same gallons twice.
- Worry about outages. A battery-powered second pump plus an alarm that sounds when the water rises too far.
- A discharge that goes nowhere useful. A pipe ending beside the foundation, or one running into the sewer, rerouted outdoors.
What Moves the Price
| Cost row | Figure | Source (year) |
|---|---|---|
| Typical basement waterproofing project | about $3,000 to $10,000 (average about $5,000) | Fixr national (2026) |
| Interior perimeter drain, per linear foot | $40 to $120 | Fixr national (2026) |
| Sump pump installation | $600 to $2,500 | Fixr national (2026) |
| Epoxy crack injection, per crack | $250 to $1,000 | Fixr national (2026) |
| Waterproof paint or sealant, per sq ft | $1 to $8 | Fixr national (2026) |
These are national figures, not a survey of local jobs. A plain swap in a sound basin lands near the low end of the sump row; a fresh pit, a battery unit and a long discharge line push it upward. Drain pipe feeding the pit is priced by the foot. The cost guide gives each source, and the cost calculator totals them for your basement.
The Work, Start to Finish
- Keep notes first. Write down when water shows up: after storms, in a thaw or most weeks.
- The contractor's visit. The contractor checks the slab, any existing pit, the nearest outlet and a route outside.
- An itemized estimate. The basin, pump make and model, check valve, backup, alarm and discharge point each appear on their own line.
- Plumbing and permits. A sump tied to a drain is plumbing: a City-licensed plumber in the City, a County-licensed master plumber or drainlayer in St. Louis County. The contractor confirms permits with the City's Building Division or your municipality and names who pulls them.
- A water test. Filling the pit by hand should start the pump and send water out the line.
Why One Contact Is Enough
You fill in the form once, and one independent local contractor replies. Homeowners are never charged and never get anything for using it; contractors may pay the site to advertise. The site sets no pumps and quotes no prices, and it carries no contractor license from the City of St. Louis or from St. Louis County.
Missouri has no statewide contractor license, so checking happens locally. At a City address, ask for the contractor's City business license; the License Collector can confirm it at (314) 622-4528. In the County, ask what your municipality requires. Get proof of liability insurance and workers' comp, and tie payments to progress, never cash or the full amount up front.
Common Questions
Is a sump pump the same thing as a backflow valve?
No. A sump handles groundwater under the floor. A backflow valve sits on the sewer line and closes when sewage pushes back toward the house. MSD's Sewer Backup Prevention Program may pay for one for customers whose backups trace to MSD's system, arranged only through MSD's Customer Care Center.
Water came up through my floor drain. Will a pump help?
Probably not. Water rising out of a floor drain points to a sewer backup, not seepage. Report it to MSD's 24-hour line at (314) 768-6260 while the signs are fresh, and ask whether MSD's system caused it.
How long should a sump pump last?
It depends on how hard the pump works; one running through every wet spell wears out sooner. Ask why a given size was chosen, and have the warranty length, what it covers and whether it passes to a later owner written into the estimate.
Related Basement Work
A pump works best with drain pipe feeding it; see basement drainage and full basement waterproofing; a single damp corner may point to basement leak repair or foundation crack repair instead.
Talk to a Contractor About Pumps
Use the form to say where water shows up, whether a pit exists and how often the pump runs. One independent local contractor working in St. Louis follows up to set a time and put a price in writing; hiring anyone stays your choice. Questions can wait until the contractor follows up.