The short answer
Water Pressure Behind the Wall
Water is the most common reason a retaining wall fails. When rain soaks the soil behind the wall, that soil becomes heavier and pushes harder against the structure. Without proper drainage, the pressure builds until the wall cracks, leans, or collapses.
In a hot, dry climate, heavy downpours can still happen during the rainy season. If your wall has no drainage pipe or gravel backfill, water has nowhere to go. Check for pooling water near the base after a storm, as that is a sign of poor drainage.
Poor Drainage and Backfill
A retaining wall needs a way for water to escape. Drainage gravel, a perforated pipe, and a filter fabric behind the wall help move water away. Without these, water sits in the soil and increases hydrostatic pressure.
You can inspect the area after heavy rain. If you see water seeping through the wall or soil washing out at the base, drainage is likely the problem. Adding drainage improvements often requires digging behind the wall, so you may want a local water damage pro to assess the situation.
- Check for cracks or gaps in the wall surface
- Look for bulging or leaning sections
- See if soil is washing away at the base
- Notice water pooling behind the wall after rain
- Listen for unusual sounds like popping or cracking
- Watch for doors or gates that stick near the wall
Soil Movement and Erosion
Soil expands when wet and shrinks when dry. Over time, this movement can shift the wall and create gaps. Erosion from heavy rain can wash away the soil that supports the wall from the bottom, making it unstable.
If you live on a slope, runoff from higher ground can make erosion worse. You might see small channels in the soil or exposed roots. Addressing erosion early, like adding gutters or downspout extensions, can reduce the stress on the wall.
Structural Issues and Age
Retaining walls are built to handle a certain amount of weight and pressure. If the wall is too short, too thin, or not reinforced properly, it can fail under normal conditions. Older walls may have rusted rebar or deteriorating concrete.
You cannot always tell a structural problem by looking. If the wall is more than a few years old and shows cracks or movement, it may need a professional assessment. A water damage inspection can help identify hidden issues before they become serious.
Signs of Failure and What to Do
Cracks, bulges, leaning, or water stains are clear warning signs. If you notice any of these, act quickly to prevent further damage. Water that seeps through the wall can reach your home's foundation, causing flooding or structural damage.
Take photos and note the location of the problem. If water is entering your home, you may need emergency water extraction to remove standing water. Then, a pro can help you understand the cause and plan a fix, which often includes improving drainage and repairing the wall.
- Take photos of the damage for your records
- Move items away from the wall to reduce weight
- Clear any blocked drainage outlets
- Avoid digging near the wall until it is assessed
- Call a pro if you see water entering your home
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (817) 799-6732Frequently asked questions
Can a retaining wall be fixed without replacing it?
Sometimes, yes. If the wall is only leaning slightly or has small cracks, adding drainage and reinforcing the base may help. But if the wall is severely bulging or collapsing, replacement is often safer. A pro can tell you what is needed.
How do I know if my retaining wall is about to fail?
Look for new or widening cracks, a wall that leans more than a few degrees, or soil washing away at the base. Water pooling behind the wall after rain is also a warning. If you see any of these, act quickly to prevent collapse.
Does homeowner's insurance cover retaining wall failure?
Policies vary, and your insurer decides what is covered. Some policies cover sudden collapse from water damage, but gradual settling or poor maintenance may not be covered. Check your policy and talk to your insurance company to understand your coverage.