Landslides risk in Missouri

Landslide characteristics in Missouri

Missouri is rated Level 1 of 5 for landslide risk, meaning the overall threat is low, but it is not zero. Landslides in Missouri are relatively rare compared to mountainous western states, but they do happen in specific settings where the right combination of slope, geology, and water occur.

The most landslide-prone areas in Missouri are the Ozark Plateau (especially in the southern part of the state) and the bluffs along the Mississippi and Missouri rivers. These regions feature steep slopes, loose or weathered rock, and soil that can become unstable when saturated. Smaller, localized landslides and slumps can also occur in roadcuts, construction sites, and residential lots where grading or excavation has changed the natural contour of the ground.

Seasonally, the highest risk occurs during wet periods, typically from spring through early summer, when heavy rainfall saturates the ground. Snowmelt and rapid temperature changes can also contribute, but in Missouri prolonged or intense rain is the most common trigger. The USGS Landslide Hazards Program notes that even small changes to drainage—like a clogged culvert or a leaky pipe—can concentrate water and cause a slope to fail.

Human activity also plays a role. Filling, cutting, or building on a slope without proper engineering can increase the likelihood of movement. While Missouri does not face the same large, fast-moving landslides seen in some regions, even a slow-moving slump can damage a home over time. That is why it is important for homeowners, especially those on hillsides or near bluffs, to know the signs of slope instability and take preventive measures.

How it affects homes

When a landslide occurs near a home, the effects can range from cosmetic cracks to serious structural damage. In Missouri, the most common types are shallow landslides, slumps, and creep—movements that may happen over weeks or months rather than suddenly. Over time, these can shift foundations, crack walls, break underground utilities, and cause doors and windows to stick. In more severe cases, earth movement can push against or partially bury a home.

The financial impact can be significant. Repairing a foundation, stabilizing a slope, or removing debris is often expensive. Unfortunately, standard homeowners insurance does not cover landslides in Missouri. The Missouri State Emergency Management Agency (SEMA) and the Ready.gov page on landslides both emphasize that landslide damage is generally excluded from typical homeowners policies. Flood insurance may cover some damage if the landslide involves floodwaters, but standalone landslide coverage is rarely offered by private insurers in the state.

FEMA assistance after a landslide is only available if the President declares a disaster, which is uncommon for the small, localized events Missouri typically sees. For most homeowners, mitigation and prevention are the best financial strategies—much more effective than relying on insurance or disaster aid.

How to prepare your home

Even with a low overall risk, taking practical steps can protect your property and reduce the chance of a landslide affecting your home. Here are concrete measures to consider:

• Improve drainage: Ensure water flows away from your foundation and downslope. Clean gutters, extend downspouts, and maintain a positive slope around the home.
• Inspect for leaks: Repair leaky pipes or irrigation lines that can saturate the soil and weaken a slope.
• Plant deep-rooted vegetation: Native grasses, shrubs, and trees with deep roots can help stabilize soil on gentle slopes. Avoid over-watering lawns on hillsides.
• Build retaining walls: If you have a steep slope, a professionally designed and properly drained retaining wall can hold back soil and prevent movement.
• Mind excavation and grading: If you plan to build, dig, or modify a slope, consult a geotechnical engineer or follow local codes. Poorly graded land can trigger landslides.
• Watch for warning signs: Look for new cracks in walls, floors, or your driveway; bulges or sagging in the ground; tilted trees or fences; and doors that become hard to open—these may indicate creeping soil movement.
• Check with local authorities: Before buying or improving a home on a slope, ask your county or city planning office about landslide risk and any regulations.

These steps are not invasive or costly, but they can save you from significant repair bills later. As the Missouri State Emergency Management Agency advises, being proactive about natural hazard risks is part of responsible homeownership.

Frequently asked questions

What should I do if I see cracks or bulges on my slope?

If you notice signs of slope movement, do not wait. First, take photos and document what you see. Then, contact a local geotechnical engineer or the county planning department for an assessment. The USGS Landslide Hazards Program recommends treating any visible movement as a warning and keeping people and pets away from the affected area, especially during or after heavy rain. Early intervention can prevent minor cracks from becoming a costly failure.

Does homeowners insurance cover landslides in Missouri?

Generally, no. Most standard homeowners insurance policies specifically exclude earth movement, including landslides. In Missouri, separate landslide or earth movement insurance is rarely available, and flood insurance only pays if flood damage is the direct cause. Because of this gap, the Missouri State Emergency Management Agency encourages homeowners to focus on mitigation—such as improving drainage—rather than assuming insurance will cover a landslide. Check with your insurance agent to understand exactly what your policy excludes.

Where can I get help with landslide mitigation?

Start with the Missouri State Emergency Management Agency (SEMA) for general guidance and connections to local programs. For technical information about landslide hazards and how to reduce risk, visit the USGS Landslide Hazards Program. Your local county or city engineering department can also provide advice on drainage, permits, and slope stability, especially if you are planning construction or major landscaping changes.

Official resources

• Missouri State Emergency Management Agency
• USGS Landslide Hazards Program
• Ready.gov – Landslides and Debris Flow