Burst pipe or slow leak, which one is covered?

The burst pipe: the claim the policy was built for

A supply line lets go, a fitting cracks, a hose bursts, a frozen line splits, and pressurized water runs until someone shuts the main. This is the loss the "accidental discharge" peril was written for, and in the standard case it pays without drama: water damage to the structure, contents, dry-out costs, and additional living expenses if the house is unlivable during repairs. Water damage and freezing claims run at roughly one in 60 insured homes per year nationally (Triple-I), and the burst supply line is the archetype.

Two carve-outs apply even to the easy claim. The policy never pays to repair the pipe itself, the failed component is excluded maintenance. And if the loss traces to long-running seepage rather than a sudden release, Florida's 14-day exclusion enters the picture. That fight has its own guide. Everything on this page is about what happens when the pipe story is more complicated than "it burst."

Supply vs. drain, two different fights

Your house has two water systems, and they fail differently. The supply side is pressurized: when it fails, water moves fast, the loss is unambiguous, and "sudden and accidental" is easy to show. The drain (sanitary) side is gravity-fed: failures are slow, corrosion, channeling, root intrusion, bellied lines, and often invisible until sewage backs up, a floor stains, or a slab starts to smell.

The claim dynamics track the plumbing. Supply-side claims fight about duration (the 14-day clause) and sublimits. Drain-side claims fight about causation, because a corroded drain is, on the carrier's telling, pure wear and tear, and wear and tear is excluded. In Florida, that drain-side fight became an industry event of its own.

Cast iron: the pre-1975 litigation wave

Until roughly 1975, Florida homes were plumbed with cast-iron drain lines, and Florida built a lot of houses before 1975, especially across South Florida, Tampa Bay, and the older coastal cities. Cast iron has a service life of about 50 to 75 years, less in Florida's conditions: humid air, salt environments, aggressive soils, and decades of drain chemicals corrode the pipe from inside and out. The math is simple, an enormous stock of housing hit end-of-pipe-life at the same time.

The result, through the late 2010s and early 2020s, was a claims wave with its own name in the industry: cast-iron claims. The pattern: a drain failure or backup, a claim for the resulting damage plus the tear-out to access the lines, a carrier denial on wear-and-tear/corrosion grounds, then suit. Insurance-industry press described aging pipe systems as a leading target of Florida's largest policyholder firms, with carriers answering that the claims were really uncovered re-plumbing projects dressed as water losses. Both things were sometimes true, which is why the claims turned entirely on evidence and policy wording.

THE EXCLUSION CARRIERS CITE ON CAST-IRON CLAIMS (TYPICAL WORDING)

"We do not insure for loss… caused by… wear and tear, marring, deterioration… rust or other corrosion… However, we do insure for any resulting loss from items… not [otherwise] excluded…"

The two halves of that clause are the two halves of every cast-iron dispute. The pipe corroded, excluded. The sewage and water that escaped when it failed damaged the house, a resulting loss, covered unless another exclusion catches it. Carriers litigated the boundary hard, and in People's Trust Ins. Co. v. Banks (Fla. 3d DCA 2023) won a notable framing battle: the court accepted that corrosion-driven deterioration fell within that policy's exclusionary scheme (treating wear and tear as an "act of nature" under the policy's definitions) and enforced the endorsement's $10,000 cap, tear-out included. The market response was broader than any case: inspections demanding sewer scopes on older homes, non-renewals of houses with original cast iron, and the sublimit era described below.

If you own a pre-1975 Florida home with original drains, the practical position is: your pipes are a known underwriting issue, your policy has probably narrowed since you first bought it, and if a failure happens the claim will be won on the camera footage, the failed section, and the tear-out itemization, not on the adjuster's goodwill.

Tear-out: "we pay to open the wall, not fix the pipe"

The strangest mechanic in property insurance lives in the water peril: the policy excludes the pipe repair but pays for the construction work around it. The standard wording:

THE TEAR-OUT PROVISION: STANDARD HO-3-STYLE WORDING (TYPICAL)

"We do pay for the cost to tear out and replace any part of a building… necessary to repair the system or appliance from which the water… escaped. We do not cover loss to the system or appliance itself."

The practical consequences: on a slab leak, the covered access-and-rebuild work is usually the bulk of the money, so a denial framed as "plumbing repairs aren't covered" is answering a question nobody asked. And on a policy with a limited-water endorsement, the same mechanic runs in reverse: Florida's Third, Fourth, and Fifth DCAs have held tear-out costs count inside the sublimit, so a $10,000 cap can be exhausted by the concrete work before the first sheet of drywall hangs. Which endorsement you have is worth knowing before the water is on the floor.

Polybutylene: the pipe nobody will insure

The supply-side counterpart to cast iron is polybutylene, the gray plastic pipe installed in millions of U.S. homes between roughly 1978 and 1995, heavily in Sun Belt states including Florida and South Carolina. Chlorine in municipal water attacks the material from the inside; it embrittles and fails suddenly, with none of the visible warning corrosion gives. The failures produced Cox v. Shell Oil (1995), a class settlement near $950 million, among the largest product-liability resolutions in U.S. history, and the manufacture of the pipe ended.

The insurance consequence outlived the settlement: polybutylene is now primarily an underwriting problem. Many carriers will not write, or will non-renew, a home with active poly plumbing, or will offer only limited water coverage until it is replaced. A burst-poly loss on an in-force policy is still a sudden discharge claim, but expect the carrier to scrutinize prior knowledge: if you knew the home had poly and a history of failures, arguments about foreseeability and neglect surface. If a four-point inspection flags poly, the re-plumb quote is also a quote for keeping your insurance.

The $10K sublimit era: water exclusion endorsements after 2022

Florida's 2022-2023 insurance overhaul (SB 2-D and SB 2-A) rebuilt the litigation landscape, one-way attorney fees gone, assignment-of-benefits agreements banned for property claims, notice windows shortened to one year under § 627.70132. In parallel, carriers rebuilt the water coverage itself. Across the Florida market, Citizens and private carriers alike, non-weather water losses are now commonly subject to one of three structures:

• Limited water damage endorsement. Non-storm water losses capped, $10,000 is the standard figure, usually taken in exchange for a premium credit, sometimes required for homes with older plumbing. Courts enforce the cap, tear-out included (Banks).
• Full water exclusion endorsement. Non-weather water losses excluded entirely; occasionally offered where a home's plumbing fails underwriting, with buy-back after a re-plumb or passing inspection.
• Managed repair programs. Coverage stays broader, but the carrier's right to select the mitigation and repair contractors is written into the policy, trading your control of the repair for their control of the cost.

None of this is hidden. It is on the declarations page and in the endorsement list, signed at binding or renewal. But it is routinely discovered at claim time. Check three things today: whether a water sublimit or exclusion endorsement is on your policy, what your mold sublimit is (see the mold guide, the two caps interact), and whether an inspection or re-plumb would restore full coverage. On a pre-1975 or poly-plumbed house, that check is worth more than any post-loss argument on this page.

How to document a pipe claim

Pipe claims are decided by physical evidence that exists for exactly one window, between discovery and repair. Four moves:

Timeline discipline for the 14-day clause: the sudden-water guide's protocol · photo methodology: the photo protocol · deadlines: claim timelines.

The hurricane angle on pipe claims

Pipe failures are mostly a non-storm loss, which is exactly why the storm connection matters when it exists. After Ian and the Helene, Milton double hit, water losses surfacing weeks after landfall sat on a coverage fault line: storm-caused (hurricane deductible, wind peril, storm deadlines) versus plumbing-caused (water peril, sublimits, the 14-day clause) versus flood-caused (excluded entirely, see the flood guide and surge vs. flood). Saltwater inundation corroding supply connections, structural racking stressing rigid drain joints, debris-loaded municipal backups, each writes a different claim. The dossier lesson from Helene's 42% closed-without-payment rate applies here in miniature: the causation story you can document beats the one you can only tell.

Florida vs. South Carolina

Deadlines shown are general rules as of July 2026 and have exceptions. Endorsement structures vary carrier to carrier, the declarations page and endorsement list on your own policy control. Verify against your policy and current statute.

Pipe claims, the questions everyone asks

Independent informational resource, not legal advice. Case summaries and statutes are drafted for education and have not been verified by counsel; consult an attorney about your specific claim. Policy language quoted is typical market wording; your form controls.