Standing Water Behind the Seawall

Q: After a few days of rain, water still pools behind my seawall — what’s causing it, and how can it be fixed?

This is one of the most common signs of hydrostatic pressure buildup. When groundwater or tidal water gets trapped behind your seawall, it pushes against the structure and seeps through cracks or joints. Our Polyurethane Grout Injection process targets the problem at its source. We inject expanding, waterproof resin into the soil behind your seawall, where it: Fills hidden voids and compacted pockets, Seals small leaks or cracks where water escapes, and Strengthens the ground to prevent future washout. Once cured, the grout forms a watertight, flexible barrier that withstands Florida’s coastal tides, storm surges, and salt exposure — keeping your seawall dry, balanced, and protected for years to come.

Q: Why does water keep pooling behind my seawall in Jacksonville, FL?

Persistent standing water behind your seawall often means pressure is trapped due to soil voids or small leaks. In Jacksonville’s coastal soil, this can worsen quickly. Experts at LUX use polyurethane grout injection to fill those voids, seal hidden cracks, and push trapped water out — restoring balance and preventing future pooling.

Q: Is standing water behind the seawall a sign of erosion in St. Augustine, FL?

Yes. Water that lingers behind your seawall usually means erosion has already begun beneath the surface. In St. Augustine’s tidal zones, this process can wash away backfill and weaken your seawall foundation. LUX repairs this by injecting expanding polyurethane grout to compact the soil, displace water, and stop erosion before it spreads.

Q: Can standing water behind my seawall cause structural damage in Palm Coast, FL?

Absolutely. Prolonged standing water increases hydrostatic pressure, which pushes against the wall and causes cracks or leaning. Experts at LUX stabilize the soil behind the seawall with polyurethane grout injection , a waterproof foam that strengthens weak ground and prevents pressure buildup — protecting your Palm Coast waterfront from costly structural damage.

Q: How can I tell if the water behind my seawall is normal in Gainesville, FL?

If water remains for more than a few hours after rainfall, it’s not normal — it’s a sign of soil instability or blocked flow paths. Our experts at LUX evaluate your seawall to locate the issue and use polyurethane grout injection to seal leaks and stabilize the soil, keeping your property dry and protected.

Q: What are the long-term effects of standing water behind seawalls in Ocala, FL?

Prolonged pooling weakens the wall’s base and erodes support soil. In Ocala’s wet climate, this can cause sinking yards or cracked caps. Experts at LUX use polyurethane grout injection to stop soil washout and restore balance, ensuring your seawall endures Florida’s heavy rainfall and humidity.

Stop standing water behind your seawall before it causes erosion or collapse.

Standing water behind your seawall signals hidden leaks or soil erosion. In Florida’s coastal climate, trapped water increases hydrostatic pressure that damages concrete and weakens the structure. LUX Foundation Solutions repairs seawall leaks using durable polyurethane grout injection to restore stability.

What is Standing Water Behind the Seawall?

Standing water behind the seawall occurs when water seeps through cracks or joints and becomes trapped in the soil instead of draining back to the waterway.

In Florida’s humid, coastal climate, this constant moisture increases hydrostatic pressure, pushing against the seawall and weakening its structure over time. The excess pressure can cause cracks, bulging panels, or even soil washout behind the wall. If left unaddressed, standing water can lead to costly structural damage or erosion.

LUX Foundation Solutions repairs these issues using polyurethane grout injection to seal leaks, stabilize soil, and restore seawall integrity permanently.

Schedule a free estimate

Signs of Standing Water Behind the Seawall in Florida

Standing water behind your seawall can seem harmless, but it’s often the first visible sign of a deeper problem. In Florida’s coastal environment, water that doesn’t drain properly builds hydrostatic pressure, erodes soil, and weakens the wall from within.

Here’s what to look for around your property:

Puddles or water pooling behind the seawall after high tide or rainfall.
Soft, muddy, or sinking ground near the wall, a sign that water is saturating and washing out soil.
Cracks forming along the seawall base or joints, where trapped water escapes under pressure.
Soil loss or small sinkholes appearing in landscaped areas near the seawall.
Bulging or leaning seawall sections, showing uneven pressure or loss of support underneath.
Efflorescence or white salt deposits on the concrete’s surface — proof of ongoing seepage.

If you see any of these issues, your seawall may already be under stress. LUX Foundation Solutions offers free seawall assessments across Florida to locate trapped water and prevent further damage with long-lasting polyurethane repair.

Puddles or Pooling Water

Soft or Sinking Soil

Cracks Along the Base

Soil Loss and Sinkholes

Bulging or Leaning Wall

Efflorescence on Seawall Surface

What Causes Standing Water Behind the Seawall in Florida?

Standing water behind the seawalls is a common issue across Florida’s coasts. It usually develops from water pressure, soil washout, or cracks that allow moisture to collect instead of draining properly.

Here are the most common causes of standing water behind seawalls across Florida:

Hydrostatic Pressure Build-Up

When groundwater or storm runoff gets trapped behind the seawall, it creates powerful upward and outward pressure. Over time, this pressure forces water through cracks or under the wall, weakening the soil and structure.

Soil Erosion and Voids

As water escapes through seawall cracks, it carries soil with it. The loss of backfill creates hidden voids where water accumulates instead of draining away. Florida’s sandy soil and frequent rainfall make this erosion-driven pooling especially common along residential shorelines.

Cracks and Leaks in the Seawall

Even small cracks allow water to infiltrate the backfill soil. As tides rise and fall, water repeatedly flows through these openings, eroding soil and forming voids that trap more water behind the seawall.

Aging or Poor Construction

Older seawalls or poorly reinforced structures often lack waterproofing or proper joint sealing. Over time, wear and weather exposure allow moisture to enter and collect behind the wall. This trapped water weakens the foundation and leads to visible standing water.

Our Proven Seawall Leaning Repair Solutions

Standing water behind your seawall means hydrostatic pressure or hidden soil voids are holding water where it shouldn’t be. LUX Foundation Solutions fixes this problem with Polyurethane Grout Injection — a precise, long-lasting solution made for Florida’s coastal soil and moisture conditions.

Technician injecting polyurethane grout behind a seawall to seal leaks and stop standing water in Gainesville, FL.

Polyurethane Grout Injection

After a few days of rain, water still pools behind my seawall — what’s causing it, and how can it be fixed?

This is one of the most common signs of hydrostatic pressure buildup. When groundwater or tidal water gets trapped behind your seawall, it pushes against the structure and seeps through cracks or joints.

Our Polyurethane Grout Injection process targets the problem at its source.
We inject expanding, waterproof resin into the soil behind your seawall, where it:

Fills hidden voids and compacted pockets,
Seals small leaks or cracks where water escapes, and
Strengthens the ground to prevent future washout.

Once cured, the grout forms a watertight, flexible barrier that withstands Florida’s coastal tides, storm surges, and salt exposure — keeping your seawall dry, balanced, and protected for years to come.

View more Seawall Repair Solutions

Schedule Your Free Seawall Standing Water Assessment Today

Don’t let standing water behind your seawall turn into costly soil erosion or wall failure. The experts at LUX Foundation Solutions provide free, no-obligation seawall assessments to locate trapped pressure and soil washout before serious damage occurs.

Using Polyurethane Grout Injection, we restore stability, seal leaks, and protect your shoreline from recurring water buildup.

We proudly serve homeowners throughout Jacksonville, St. Augustine, Palm Coast, Gainesville, Ocala, and coastal areas across Northern Florida.

Call 904-921-3589 or schedule your free seawall assessment online today.

Request a free Estimate

Standing Water Behind the Seawall FAQs

Why does water keep pooling behind my seawall in Jacksonville, FL?

Persistent standing water behind your seawall often means pressure is trapped due to soil voids or small leaks. In Jacksonville’s coastal soil, this can worsen quickly.

Experts at LUX use polyurethane grout injection to fill those voids, seal hidden cracks, and push trapped water out — restoring balance and preventing future pooling.

Is standing water behind the seawall a sign of erosion in St. Augustine, FL?

Yes. Water that lingers behind your seawall usually means erosion has already begun beneath the surface. In St. Augustine’s tidal zones, this process can wash away backfill and weaken your seawall foundation.

LUX repairs this by injecting expanding polyurethane grout to compact the soil, displace water, and stop erosion before it spreads.

Can standing water behind my seawall cause structural damage in Palm Coast, FL?

Absolutely. Prolonged standing water increases hydrostatic pressure, which pushes against the wall and causes cracks or leaning.

Experts at LUX stabilize the soil behind the seawall with polyurethane grout injection, a waterproof foam that strengthens weak ground and prevents pressure buildup — protecting your Palm Coast waterfront from costly structural damage.

How can I tell if the water behind my seawall is normal in Gainesville, FL?

If water remains for more than a few hours after rainfall, it’s not normal — it’s a sign of soil instability or blocked flow paths.
Our experts at LUX evaluate your seawall to locate the issue and use polyurethane grout injection to seal leaks and stabilize the soil, keeping your property dry and protected.

What are the long-term effects of standing water behind seawalls in Ocala, FL?

Prolonged pooling weakens the wall’s base and erodes support soil. In Ocala’s wet climate, this can cause sinking yards or cracked caps. Experts at LUX use polyurethane grout injection to stop soil washout and restore balance, ensuring your seawall endures Florida’s heavy rainfall and humidity.