A slab leak is a leak in the water lines running beneath your home’s concrete foundation. In older copper systems, the most common culprit is a pinhole leak — corrosion eats a tiny hole in the pipe, and water escapes under the slab where you can’t see it.
Why East Boca & Delray are slab-leak territory
Much of the coastal housing stock in East Boca Raton and Delray Beach dates to the 1960s and 1970s and was built on slabs with copper supply lines. Decades of water chemistry, high humidity, and salt-air conditions near the coast accelerate copper corrosion. The result is a steady stream of pinhole and slab leaks in these neighborhoods — in single-family homes and in the many mid-century condos along the barrier island and downtown corridors.
Condo boards & HOAs
Slab and pinhole leaks are a recurring, under-served issue for Boca and Delray condo associations. Leaks can cross unit lines, trigger water-damage claims, and raise questions of association vs. owner responsibility. Boards benefit from a documented detection-and-repair plan and a relationship with a licensed plumber before the next leak — not during the emergency.
Signs of a slab leak
- An unexplained jump in your water bill
- The sound of running water when everything is off
- A warm spot on the floor (if it’s a hot-water line)
- Low water pressure throughout the home
- Cracks in flooring or walls, or damp/buckling spots on the slab
- A musty smell or unexplained mold from moisture under the slab
- The water meter still turning with all fixtures off
How detection works
Finding the leak without tearing up the whole floor is the first job. Licensed leak-detection plumbers use electronic acoustic listening, pressure testing to isolate the line, and sometimes thermal imaging or tracer methods to pinpoint the exact spot. Accurate location keeps the repair small.
Repair options
Spot repair
Open the slab at the leak, cut out the damaged section, and replace it. Best when there’s a single, well-located pinhole and the rest of the copper is sound.
Reroute / bypass
Abandon the failed under-slab segment and run a new line overhead or through walls. Avoids repeated slab cuts when access is awkward.
Repipe
When pinhole leaks keep recurring, replacing the home’s aging copper supply (often with PEX or copper) is frequently more cost-effective than chasing one leak after another. Common in homes that have already had multiple pinholes.
What affects the cost
- Detection complexity and how accessible the leak is
- Spot repair vs. reroute vs. full repipe
- Slab depth, flooring type, and finish restoration (tile, stone, hardwood)
- Single-family home vs. condo (access, shared walls, association rules)
- Permit and inspection fees through the city building department
| Scope of work | Directional planning range |
|---|---|
| Slab-leak detection (locating) | $150 – $600 |
| Single spot/pinhole repair | $500 – $1,500+ |
| Reroute / bypass of a line | $2,000 – $5,000+ |
| Whole-home copper repipe | $6,000 – $15,000+ |
| Flooring / finish restoration | Varies widely |
Permits, condos & who can do the work
Slab-leak repairs and repipes are permitted work. In East Boca Raton the permit and inspections go through the City of Boca Raton; in Delray Beach through the City of Delray Beach (the AHJ). Condo work may also need association approval and coordination, and responsibility for in-slab lines can hinge on the association’s governing documents — review those and talk to the board. Use a Florida state-licensed plumbing contractor, who pulls the permit and schedules inspections. Confirm current permit fees with your city.
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Frequently asked questions
How can I tell if I have a slab leak?
Common signs are a sudden spike in your water bill, the sound of running water when everything is off, a warm spot on the floor, low pressure, and the water meter still turning with all fixtures closed. A leak-detection plumber can confirm and locate it precisely.
Why are pinhole leaks so common in older Boca and Delray homes?
Homes from the 1960s and ’70s here were plumbed in copper, and decades of water chemistry plus humid, coastal, salt-air conditions corrode copper from the inside until a pinhole forms. Once one appears, others on the same system often follow.
Can the leak be found without breaking up my floor?
Yes — that’s the point of professional detection. Acoustic listening, pressure testing, and thermal imaging pinpoint the leak so the repair opening is as small as possible.
Spot repair or full repipe?
A single, well-located pinhole in otherwise sound copper is often a spot repair. But if you’ve had repeated pinhole leaks, a repipe is frequently more cost-effective than fixing them one at a time. A licensed plumber can advise after inspection.
Who’s responsible for a slab leak in a condo — the owner or the association?
It depends on the association’s governing documents and where the leak is. In-slab and shared lines are a common gray area. Review the condo docs and coordinate with the board; this is general information, not legal advice.
Do slab-leak repairs need a permit?
Repairs and repipes are permitted work through the City of Boca Raton or City of Delray Beach. Your licensed plumber typically pulls the permit and schedules inspections; condos may also require board approval. Confirm current fees with the city AHJ.
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