If your house dates to the 1950s, ’60s, or early ’70s, the original plumbing was likely galvanized steel supply lines and cast-iron drain-waste-vent (DWV) piping. Both have a finite lifespan, and a lot of that pipe in eastern Palm Beach County is now well past it.
Why this matters in Lake Worth Beach & older WPB
Lake Worth Beach and the historic cores of central and north West Palm Beach have a high share of pre-1975 homes. Two things tend to age out at once in those houses:
- Galvanized steel supply lines corrode from the inside, narrowing the pipe, dropping pressure, and tinting water rusty-brown.
- Cast-iron drain lines under the slab corrode and scale over decades. In Florida’s warm, humid, high-water-table conditions they can crack, channel, or collapse, leading to slow drains, sewer odors, and slab disruption.
Because so much of the local housing stock hit these milestones around the same time, repipe and cast-iron replacement are some of the most common big-ticket plumbing projects in the area — yet very few contractors publish neighborhood-specific guidance for it.
Signs your pipes may be due
- Brown, yellow, or metallic-tasting water, especially on the first draw of the morning
- Weak or steadily declining water pressure across multiple fixtures
- Repeated pinhole leaks or patch repairs on the same lines
- Drains that are slow throughout the house (not just one fixture), gurgling, or backing up
- Persistent sewer-gas smell, or damp/discolored spots on the slab
- A sewer camera that shows scaling, cracking, or ‘channeling’ (the bottom of the cast-iron pipe worn away)
Florida insurance angle
Florida property insurers have tightened sharply on older homes. Carriers increasingly ask about plumbing age and material, and a documented repipe (or proof that cast-iron drains have been replaced or lined) can make a home easier to insure or renew. Many owners now repipe proactively rather than wait for a denial or a non-renewal. Check your own carrier’s position with your agent.
Your replacement options
Supply-line repipe
The aging galvanized water lines are replaced, typically with PEX or CPVC. PEX is flexible, fast to route, and resists scale; CPVC is rigid and long-established in Florida. Most repipes run new lines through walls, ceilings, and attic space, followed by drywall patching.
Cast-iron drain replacement vs. lining
For failed under-slab drains you generally choose between full replacement (opening the slab to remove and replace the cast iron with PVC) or trenchless lining / pipe bursting where the pipe layout allows. Replacement is more invasive but definitive; lining is less disruptive but depends on the existing pipe’s condition and routing. A camera inspection is the starting point for either.
What affects the cost
- Home size & number of bathrooms — more fixtures means more pipe and more connections.
- Slab vs. crawlspace and one vs. two stories — slab homes are the norm here and drive drain-work cost.
- Supply repipe only vs. supply + cast-iron drain replacement — drain work under a slab is the bigger variable.
- Trenchless lining vs. open-slab replacement
- Drywall, tile, and finish restoration after the work
- Permit and inspection fees through your local building department
| Scope of work | Directional planning range |
|---|---|
| Whole-home supply repipe (PEX/CPVC) | $6,000 – $15,000+ |
| Cast-iron drain replacement (open slab) | $8,000 – $30,000+ |
| Trenchless drain lining (where feasible) | $4,000 – $20,000+ |
| Sewer camera inspection (diagnostic) | $150 – $600 |
Permits & who can do the work
Repiping and drain replacement are permitted work in Florida. In Lake Worth Beach the permit and inspections run through the City of Lake Worth Beach building department; in West Palm Beach through the City of West Palm Beach; and in unincorporated pockets through Palm Beach County’s building division (the “authority having jurisdiction,” or AHJ). Work should be performed by a Florida state-licensed plumbing contractor, who normally pulls the permit and schedules the required inspections. Confirm current permit fees and requirements with your specific AHJ — they vary by municipality and change over time.
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Frequently asked questions
How do I know if my Lake Worth Beach home still has its original cast-iron drains?
Homes built before the mid-1970s in this area very often have cast-iron drain-waste-vent piping under the slab. The most reliable way to confirm condition is a sewer/drain camera inspection, which shows scaling, cracking, or channeling inside the pipe.
Slow drains throughout the house, recurring backups, and sewer odors are common warning signs that the cast iron is failing.
Should I repipe proactively for insurance reasons?
Many Florida homeowners now do. Insurers have grown stricter about older plumbing, and a documented repipe or drain replacement can help with insurability and renewals.
Whether it makes sense for you depends on your carrier, your home’s pipe condition, and your budget — this is general information, not insurance advice, so confirm specifics with your agent.
PEX or CPVC for the supply repipe?
Both are widely used in Florida. PEX is flexible and quick to route with fewer fittings; CPVC is rigid and has a long local track record. A licensed plumber can recommend based on your layout, water chemistry, and preference.
Can the cast-iron drains be replaced without tearing up my whole floor?
Sometimes. Trenchless lining or pipe bursting can renew or replace drain lines with far less slab disruption, but it depends on the pipe’s routing and condition. Open-slab replacement is the fallback when lining isn’t feasible. A camera inspection determines which is realistic.
How long does a whole-home repipe take?
A supply repipe on a typical single-family home is often a few days of plumbing plus drywall patching afterward. Cast-iron drain replacement under a slab takes longer and is more disruptive. Your plumber can give a schedule after inspecting the home.
Do I need a permit?
Yes — repiping and drain replacement are permitted work. Your licensed plumbing contractor typically pulls the permit through your local building department (Lake Worth Beach, West Palm Beach, or Palm Beach County) and schedules inspections. Verify current fees with your AHJ.
Want the full breakdown? Read our in-depth Florida plumbing guides →