The main signs of a failing seawall are cracks and rust stains on the cap or face, open or leaking panel joints, sinkholes or soft ground behind the wall, a wall leaning toward the water, and scour at the toe. Fort Lauderdale presumes a wall is in disrepair if it lets soil erode, material pass through it or tidal water flow onto neighbours (City of Fort Lauderdale, 2022).
Seawall inspection checklist
Walk the wall at low tide, from the yard and, if you can, from the water.
- Cap: cracks, spalling, exposed or rusting rebar, rust stains.
- Face and panels: cracks, open joints, panels out of line.
- Lean: a wall tipping toward the water, or a cap that is no longer level.
- Land side: sinkholes, soft or sinking ground, water bubbling up at high tide.
- Toe: a gap or hollow under the base of the wall.
- Height: water over the cap at king tides.
What each sign usually means
| Sign | What it usually means | Typical fix |
|---|---|---|
| Cracks and rust stains on the cap | Water reaching the rebar | Spall repair or a new cap |
| Open or leaking joints | Soil washing out through the wall | Joint sealing, then backfill |
| Sinkholes behind the wall | Loss of fill through joints or under the toe | Seal the leak, then backfill |
| Wall leaning out | Tiebacks or anchors failing | New tiebacks, or replacement |
| Scour at the toe | Wave or wake action | Riprap or toe repair |
| Water over the cap | Wall too low | Cap raise or new wall |
What the cities say
How long does a seawall last?
Fort Lauderdale's ordinance FAQ assumed a design life of about 50 years, and city engineers described 30 to 50 years for a new wall.[4]
Many first repairs need no DERM permit
In Miami-Dade, sealing cracks, spall repair, pilaster repair, backfilling and small toe repairs no more than 2 ft waterward are exempt from a Class I permit.[1] Catching problems early keeps you in that cheaper category.
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Frequently asked questions
How do I know if my seawall is failing?
Look for cracks and rust stains on the cap, open joints, sinkholes behind the wall, a lean toward the water and scour at the toe, ideally at low tide.
Is a leaking seawall an emergency?
Not always, but leaks speed up once soil starts washing out, and some cities treat a wall that lets water through as a code violation.
How long does a seawall last?
Fort Lauderdale's ordinance FAQ assumed about 50 years, and city engineers described 30 to 50 years for a new wall.
Sources
- Class I Permit Application for Coastal Construction and Mangrove Trimming within Miami-Dade County (Revised May 2025), Miami-Dade County RER, Division of Environmental Resources Management (DERM), Coastal Resources Section. Accessed October 27, 2026.
- Seawall FAQs (Miami Beach Rising Above, PDF dated 6.16.25), City of Miami Beach. Accessed October 27, 2026.
- Staff Report, Planning and Zoning Board, 16 Nov 2022, Case UDP-T22010 (Tidal barrier / seawall ordinance amendment, ULDR 47-19.3), City of Fort Lauderdale. Accessed October 27, 2026.
- Seawalls and Sea Level Rise Induced Flooding (Florida Sea Grant compilation, includes City of Fort Lauderdale 'Frequently Asked Questions: Seawall Ordinance Implementation', 25 Jan 2017), Florida Sea Grant (reproducing City of Fort Lauderdale and Florida Bar ELULS material). Accessed October 27, 2026.
