Florida Seawall GuideDescribe My Seawall Problem

Seawall erosion: the failure that appears on the land side first

By the time a hole appears in the yard, the soil that used to be there left through the wall a long time ago.

This is the failure mode that catches owners out, because every stage of it except the last is invisible. The wall looks fine. The water looks fine. Then a paver dips, or a pool deck edge drops half an inch, and the assumption is settlement or poor original compaction.

Frequently it is neither. It is the wall.

How it progresses

  1. 01A path opens

    A joint separates, a crack forms, a weep hole loses its filter fabric, or a gap opens below the waterline. Nothing is visible from the yard yet.

  2. 02Fines migrate

    Water moving in and out with the tide carries the smallest soil particles out through the path. The volume lost per cycle is trivial. The number of cycles is not.

  3. 03A void forms

    Material has left but the ground above has not yet collapsed into the space. This is the stage where the problem is largest relative to its visibility — often entirely invisible.

  4. 04Surface settlement

    The ground finally subsides into the void. A depression appears, or a slab edge drops, or pavers begin to dish. This is usually the first thing an owner notices.

  5. 05Collapse

    A sinkhole opens, or a section of hardscape drops. At this point the void has been developing for a long time.

Why filling the hole is not the fix

Backfilling a void restores the surface and removes the evidence. If the path through the wall is still open, the same process starts again with fresh material. The sequence that actually holds is: find the path, close the path, then deal with the void.

Finding the path usually means going below the waterline, which is why an inspection that stops at the cap tends to miss this entirely.

Erosion is not only a private problem

Shoreline erosion is being addressed publicly in parts of Florida — Pinellas County received a federal watershed grant for post-storm streambank stabilisation. That work is public creek and drainage infrastructure, and it is worth being precise about: it is not a funding route for a private seawall, and nobody should read it as one.

The documented context

VERIFIEDBC-03

In Broward County, letting tidal water cross onto a neighbouring property or the public right of way is a citable offence, not merely a maintenance problem.

  • Causing, suffering, or allowing the trespass of tidal waters onto adjacent property or public right-of-way is declared a public nuisance and a citable offence requiring abatement.
  • Barriers below the 5 feet NAVD88 minimum are still required to be improved, designed and constructed so as to prevent tidal waters from impacting adjacent property or public right of way.
Source
VERIFIEDMB-02

In Miami Beach most of the seawall network is privately owned, and overtopping itself triggers obligations.

  • 91% of seawalls in the city are on private property.
  • The ordinance establishes overtopping as a trigger for seawall elevation and for maintenance requirements.
  • Seawalls must be maintained in good repair to prevent soil eroding into the bay or waterway and to prevent tidal water flowing through the seawall onto adjacent private property.
  • The City references a matching grant for private seawall upgrades and PACE financing as potential funding routes for owners.

Read carefully: Grant and PACE availability changes. Confirm current terms with the City before assuming either is open to you.

Source
LOCAL EVIDENCEPIN-01

Pinellas County received a $29.4 million federal grant to repair storm-damaged creeks — which is shoreline erosion work, not seawall replacement.

  • The award is a USDA Emergency Watershed Protection Program grant of $29.4 million, reported in mid-2026.
  • Approximately $26.8 million is for construction and approximately $2.7 million for engineering, environmental review, technical support and administration.
  • Named projects include Joe's Creek, Curlew Creek, Smith Bayou and South Creek.
  • The work is described as stabilising streambanks, restoring water flow and strengthening drainage in areas affected by Hurricane Milton.

Read carefully: Coverage conflicts on scope: one outlet describes five waterways while the itemised reporting names four. Both are recorded here and neither is adjusted. This programme is public creek and streambank work — it is not a private seawall funding source, and no part of it should be read as available to a private owner.

Source

Questions we can answer from sources

Why is there a hole in my yard near the seawall?
Most commonly because soil has been migrating out through the wall — via an open joint, a crack, a failed weep hole filter or a gap below the waterline — leaving a void that the ground above has finally settled into. The hole is the last stage of the process, not the beginning.
Can filling the void fix the problem?
Filling the void without closing the escape path re-runs the same process. The void is the symptom. The path through the wall is the cause, and it is usually below the waterline where it cannot be seen from the yard.
Is soil loss behind a seawall an emergency?
It depends entirely on what is above the void and how large it is, which is not something a website can assess. What is worth knowing is that in Broward County allowing tidal water to trespass onto adjacent property or the public right of way is a citable offence, so a failing wall can become an enforcement matter as well as a structural one.

Related