How to Prevent Basement Flooding in St. Louis

Your sump pump is one of the hardest-working parts of your basement waterproofing system. It sits quietly in the pit, waiting for trouble, like a tiny basement lifeguard with no whistle.

When spring storms hit St. Louis, your sump pump needs to be ready before the water table rises. A pump that fails during a storm can turn a small water problem into a full basement flood.

Sump Pump Maintenance Checklist

Check your sump pump at least twice a year, ideally in early spring and late fall.

• Pour a bucket of water into the sump pit to make sure the pump turns on.
• Confirm the pump shuts off after the water level drops.
• Make sure the float switch moves freely and does not stick.
• Clean mud, gravel, and debris from the sump pit.
• Check that the discharge pipe is not blocked, frozen, cracked, or disconnected.
• Make sure the discharge line sends water away from the foundation.
• Test the battery backup if your system has one.
• Listen for grinding, rattling, or humming sounds.
• Replace pumps that are old, weak, noisy, or cycling too often.

Consider a Battery Backup

Spring storms often bring power outages. Unfortunately, power outages and sump pumps have a very inconvenient relationship. If your pump loses power during a heavy rain, your basement may be left unprotected.

A battery backup sump pump can help keep water moving during outages. If your basement has flooded before, has finished living space, or stores valuables, a backup system is worth serious consideration.

When to Call Midwest Flood Restoration

Schedule a professional inspection if:

• Your pump runs constantly.
• Water is entering even though the pump works.
• The pump is more than 7 to 10 years old.
• You hear unusual noises.
• The sump pit smells musty or sewage-like.
• You are not sure where the discharge line drains.
• Your basement has flooded before.

A sump pump is not something you want to “figure out later.” Later usually arrives wearing rain boots.

A French drain is a drainage system designed to collect and redirect water away from areas where it can cause problems. It usually includes a trench, gravel, and a perforated pipe that moves water away from the foundation or toward a sump system.

French drains can be installed outside the home, inside the basement perimeter, or in specific yard areas where water collects.

Signs You May Need a French Drain

A French drain may help if you notice:

• Water pooling near the foundation
• Soggy areas in the yard after rain
• Basement seepage along the wall and floor joint
• Water stains on basement walls
• Musty basement odors
• Repeated flooding after storms
• Soil erosion near the home
• Downspout water that has nowhere to go

French Drain Maintenance Checklist

If you already have a drainage system, keep it working by checking:

• Drain outlets for leaves, mud, roots, or animal nests
• Gravel areas for sediment buildup
• Yard drains after heavy rain
• Low spots where water still pools
• Sump pump intake if the drain connects to a sump system
• Signs of slow drainage or standing water

French drains are not a “set it and forget it forever” system. They are more like gutters underground. They work best when they stay clear.

Midwest Freeze-Thaw Tip

During St. Louis winters, water can freeze in soil and drainage lines. As temperatures rise and fall, the ground expands and contracts. This can shift soil, open small gaps near the foundation, and stress drainage systems.

Before winter, make sure exterior drain outlets are clear and sloped properly. After the first thaw, walk your property and look for new pooling, soil movement, or basement moisture.

Your yard should slope away from your home. If it slopes toward the foundation, every heavy rain is basically sending an invitation that says, “Basement party, water welcome.”

Proper grading helps move water away before it builds pressure against the foundation.

What Good Grading Looks Like

Ideally, soil should slope away from the house for several feet. Low spots near the foundation should be filled and compacted so water does not collect there.

Pay close attention to:

• Areas under downspouts
• Basement window wells
• Walkways and patios that slope toward the house
• Mulch beds against the foundation
• Driveways that direct water toward the garage or basement
• Settled soil near foundation walls

Landscaping Checklist for Flood Prevention

Use this checklist each spring and fall:

• Walk around the house after a rain and look for standing water.
• Fill low areas near the foundation with compacted soil.
• Keep mulch below the siding and away from weep holes.
• Avoid piling mulch high against the foundation.
• Trim shrubs so you can inspect the foundation.
• Make sure patios, sidewalks, and driveways do not send water toward the house.
• Check window wells for debris and proper drainage.
• Add window well covers where needed.
• Keep large tree roots from damaging drains, sewer lines, or foundation areas.

Watch Out for Decorative Landscaping

Rock beds, edging, and retaining walls can look great, but they can also trap water if they are installed without proper drainage. If water is being held near the house instead of moving away, that landscaping feature may be doing a little too much.

Pretty is good. Pretty and dry is better.

Gutters are one of the simplest flood prevention tools on your home. When they work, they quietly move thousands of gallons of roof water away from your foundation. When they clog, overflow, or drain too close to the house, your basement may pay the price.

Gutter Maintenance Checklist

Inspect your gutter system in spring and fall, plus after major storms.

• Remove leaves, sticks, shingle grit, and debris.
• Make sure gutters are securely attached.
• Check for sagging sections.
• Look for leaks at seams and corners.
• Confirm water flows toward the downspouts.
• Make sure downspouts are not clogged.
• Add downspout extensions where needed.
• Direct downspouts away from the foundation.
• Check splash blocks for proper placement.
• Look for soil erosion under downspout outlets.

How Far Should Downspouts Drain?

As a general rule, downspouts should discharge several feet away from the foundation, and farther is better when your yard allows it. The goal is to move roof runoff away from the home, not dump it into the soil right next to the basement wall.

If your downspouts empty into underground drains, check the outlet after rain. If no water comes out, the line may be blocked.

Spring Rain Tip

Before the first major spring storm, take a few minutes to clean gutters and test downspouts with a garden hose. It is not glamorous, but neither is carrying wet cardboard boxes out of a basement at midnight.

Flood barriers can help protect vulnerable basement entries, walkout doors, garage openings, window wells, and low foundation areas during storms. They are not a replacement for drainage, grading, or sump pump maintenance, but they can provide an extra layer of protection when heavy rain overwhelms the usual defenses.

Types of Flood Barriers to Consider

Depending on your home, flood protection may include:

• Temporary water-filled barriers
• Sandbags
• Door flood shields
• Window well covers
• Basement stairwell drains
• Backflow prevention devices
• Sealed basement entry doors
• Garage threshold barriers

Flood Barrier Checklist

Before storm season:

• Identify low entry points around your home.
• Store temporary barriers where they are easy to access.
• Check that basement doors seal tightly.
• Clear drains at basement stairwells.
• Cover window wells.
• Inspect weatherstripping around exterior doors.
• Keep sandbags or water barriers ready if your home has flooded before.
• Make sure everyone in the household knows where flood supplies are stored.

Flood barriers work best when they are placed before water arrives. Once the water is already at the door, the job becomes less “home maintenance” and more “very stressful arm workout.”