Cast Iron Pipes: How Long Drain Lines Last and the Florida Insurance Fight

This month in brief

• Insurers prevailed in 9 of 13 Florida appellate opinions on homeowner claims over failed cast iron drain pipes, 2017 to 2026 (KBR registry from flcourts.gov).
• Tear-out, the cost to break and restore a slab to reach the pipe, was ruled on 8 times and insurers won 6 (75.0%).
• Three District Courts held that corrosion of cast iron pipe is an act of nature under water damage exclusion endorsements sold for a premium credit, $151 in one case.
• The appellate record trails the loss by a median of 7 years, so the 2022 and 2023 reforms have not yet reached it.
• Florida cut the notice window for a property claim from 2 years to 1 year on 2022-12-16 and repealed one-way attorney fees in 2023.
• Two drains with dated failures in the record were 53 and 57 years old; higher lifespan figures come from the pipe industry or from firms that sell repairs or litigation.
• Cast iron soil pipe producer prices rose 94.9% from January 2020 to September 2026; plastic drain pipe rose 47.0%.

Insurers prevailed in 9 of 13 Florida appeals over failed cast iron pipes

KBR read every Florida appellate opinion in the state courts' official index that mentions cast iron and coded the 13 that are homeowner insurance claims over failed drain lines. Insurers prevailed in 9 (69.2%), homeowners in 2 and 2 were mixed.

The Florida courts' official opinion search returned 30 opinions whose text contains "cast iron" across the Supreme Court and the six District Courts of Appeal (Florida State Courts System, searched 2026-11-08). Thirteen are disputes between a homeowner and a property insurer over a failed cast iron drain or sewer line; the other 17 mention cast iron in passing, from a cast iron sewing machine in a criminal case to citations of the company American Cast Iron Pipe.

Coded at the appeal stage, the insurer prevailed in 9 of the 13 opinions (69.2%), the homeowner in 2, and 2 were mixed (KBR registry). All 13 came from District Courts of Appeal; the Florida Supreme Court dismissed review of the one case it was asked to take, Security First v. Vazquez (SC22-583), according to the Third District's opinion in Banks. Twelve of the 13 opinions (92.3%) were filed in 2021 or later.

The money fight is tear-out: 6 of 8 slab access rulings went to insurers

Cast iron drains in Florida slab homes run under the concrete, so the cost of breaking and restoring the floor often exceeds the water damage. Eight opinions ruled on that tear-out cost and insurers won 6 (75.0%).

Tear-out: The cost to tear out and replace part of a building to reach a failed plumbing system. The standard policy wording in these cases covers it only as part of a covered water loss; the pipe itself is not covered.

In Diaz (Fifth DCA, 2023) a jury awarded $9,500 for water damage and $25,300 for tear-out, 2.66 times as much; the appeal removed the tear-out. In Vazquez (Fifth DCA, 2022) the parties stipulated a $40,000 tear-out cost, 4.0 times the $10,000 endorsement cap, and the homeowners kept it because the cap was ambiguous. In Banks (Third DCA, 2023) an appraisal award of $113,318.17, 11.3 times the cap, was reversed.

Feltes (Sixth DCA, 2024) turned on a different clause: State Farm's exclusion for repeated seepage or leakage. The court held that wastewater escaping the 1961 drain line into the fill under the slab was not a covered loss, so a jury's tear-out award of nearly $60,000 was reversed while the rest of the judgment stood. Karmo (First DCA, 2026) went the other way on liability: the record supported more benefits for access to failed under-slab drains, but the $335,000 verdict was 4.2 times the only admitted estimate of $79,680.22 and was sent back for a new damages figure.

A $151 premium credit turned rust into an excluded act of nature

Several insurers sold a water damage exclusion endorsement for a premium discount, with a $10,000 limited water damage buy-back. Three District Courts held that corrosion of cast iron pipe is an act of nature under that wording.

Water damage exclusion (WDX) and limited water damage (LWD) endorsements: Optional policy endorsements. The WDX removes coverage for water discharged from plumbing when caused by human or animal forces or any act of nature; the LWD buys back sudden and accidental water damage up to a stated limit, $10,000 per loss in these opinions.

In Gunsser (Sixth DCA, 2023) the homeowner took a $151 premium credit for the exclusion and paid $91 to buy back limited water damage coverage, a net credit of $60. The court enforced both: water damage up to $10,000, no tear-out. Dodge (Fourth DCA, 2021) and Rosa (Fifth DCA, 2022) held that rust or corrosion of cast iron pipes is a naturally occurring force, so the exclusion applied; the Sixth District agreed in Gunsser.

The courts split on tear-out under these endorsements. The Fifth District held in Vazquez (2022) that the $10,000 cap did not limit tear-out costs, in a case where the parties had agreed the endorsement covered tear-out. The Fourth, Third and Sixth Districts then held the People's Trust endorsement does not cover tear-out at all (Panettieri, 2022, as cited in Banks; Banks, 2023; Gunsser, 2023), and the Fifth District followed them in Diaz (2023), calling Vazquez distinguishable.

The appeals court record runs about 7 years behind the leak

Seven opinions state the year of the loss; the median gap to the appellate opinion is 7 years. Every case in the registry began before the 2022 and 2023 reforms, so the case law does not yet show their effect.

Stated loss years run from 2010 (Maspons) to 2020 (Koss), and the gap to the appellate opinion ranged from 5 to 9 years, median 7 (KBR calculation from the opinions). Eight of the 13 opinions were filed after chapter 2022-271 took effect on 2022-12-16, but each of those suits was filed in a trial court before 2022.

That lag matters for reading the outcome count. The 1-year notice deadline, the end of one-way attorney fees and the assignment ban apply to claims and policies that will reach the District Courts of Appeal around the end of this decade, if the 7-year median holds.

Florida cut the claim notice window to 1 year in December 2022

Between July 2021 and March 2023, four laws changed when a slow drain leak must be reported, who can sue on it and who pays the lawyers. Citizens, the state-created insurer, also began asking for drain pipe age and material.

Before chapter 2021-77, the notice deadline in section 627.70132 covered windstorm and hurricane claims. From 2021-07-01 it covered any peril, with 2 years to report a claim and 3 years for a supplemental claim. Chapter 2022-271 cut those to 1 year and 18 months from 2022-12-16, a 50% cut in each window (Fla. Stat. 627.70132).

Chapter 2022-271 also deleted the property insurance fee right in section 627.428 and barred assignment of post-loss benefits under policies issued on or after 2023-01-01; chapter 2023-15 repealed section 627.428 outright, effective 2023-03-24. A claimant must give at least 10 business days' notice before filing suit under section 627.70152. Chapter 2022-268 set roof rules (no refusal solely for roof age under 15 years) and, per the Florida Senate bill summary, required claimants to establish that the insurer breached the contract to prevail in certain damages claims.

Court records put two failed drains at 53 and 57 years old

This report could not open any government service-life table for residential cast iron drain pipe. The court record shows two dated failures, and the higher lifespan claims come from parties with a stake.

The Maspons home in Miami-Dade was built in 1957 on a slab with cast iron sanitary drains; its kitchen sink began draining slowly in December 2010, 53 years later. The Feltes home in Lee County was built in 1961; its first overflow came in autumn 2018, 57 years later, and the plumber described the original line as holed after sixty years of use.

The Cast Iron Soil Pipe Institute, the manufacturers' association, says more than 535 US utilities have cast iron water and gas mains in service for more than 100 years and 53 for more than 150 years; those are buried pressure mains, not house drains. A plaintiffs' law firm cites a purported 80 to 100 years and failures after a few decades in Florida, and a repiping contractor gives 30 to 100 years; neither names a source.

Salt marsh soil, acid and grease explain early failures better than age

Federal corrosion research and the manufacturers' handbook point to soil chemistry, bacteria, acidic waste and grease as the drivers, which is why two drains of the same age can end up in very different condition.

• Soil: CISPI says more than 95% of US soils are non-corrosive to cast iron, and lists the exceptions as soils with decomposing organic matter, alkalis or salt, naming tidal marshes (CISPI handbook, 2006 printing).
• Bacteria and graphitization: the National Bureau of Standards study of 36,500 buried specimens at 128 sites found sulfate-reducing bacteria in anaerobic soils convert sulfates to iron sulfide, and described graphitization of cast iron, corrosion driven by galvanic action between the iron and the graphite inside the metal (NBS Circular 579, 1957).
• Acid waste: CISPI says acids at pH 4.3 or lower corrode cast iron pipe from the inside if left in contact.
• Grease: CISPI says grease can solidify and coat a pipe's interior, and that lye-based cleaners can turn grease into soap that clogs the line tighter.
• Scale and detritus: the insurer's plumber in Maspons found two holes in the drain plus scale and detritus in other lines.

Citizens Property Insurance Corporation has required a 4-point inspection for homes over 20 years old since its 2022 rules, down from 30 years, and its March 2025 form asks the age of the drain system and lists cast iron among pipe types (Citizens).

3.0 million Florida homes were built from 1950 to 1979

The two dated failures in the court record were homes built in 1957 and 1961. Florida has 3.0 million homes from the 1950 to 1979 decades, 27.8% of its stock.

The American Community Survey 2025 1-year estimates, released 2026-10-29, count 3.0 million Florida housing units built from 1950 to 1979, 27.8% of 10.8 million. The national share is 31.9%. Florida's housing stock is younger: 31.2% of its homes were built before 1980, against 47.4% nationally. Year built is not pipe material, and the ACS does not record plumbing type; the how old is my house report covers dating a home.

Cast iron soil pipe prices rose 94.9% since January 2020, plastic drain pipe 47.0%

The BLS producer price index for cast iron soil pipe and fittings nearly doubled from January 2020 to September 2026, while plastic drain, waste and vent pipe, which peaked in July 2022, ended up about half as much.

Rebased to January 2020 = 100, cast iron soil pipe stood at 194.9 in September 2026 (preliminary) and plastic drain, waste and vent pipe at 147.0, a gap of 47.9 points (KBR calculation from BLS PPI flat files). Over the past 12 months, plastic DWV pipe rose 9.5% and cast iron soil pipe 5.0%.

BLS published no cast iron soil pipe values from November 2021 to September 2023; across that gap the index rose 29.8%. The latest step was a 4.4% jump from November to December 2025. Plastic DWV pipe peaked earlier, at 194.5 in July 2022 on the January 2020 base, and has since fallen back to 147.0. These are producer prices for pipe and fittings, not installed cost; the wider materials basket is in the building material prices report.

Drain line work under a bathroom floor is usually priced with the rest of a remodel; see bathroom remodel cost and the contractor directory. Other old-house materials are covered in the Orangeburg pipe, polybutylene pipe and knob and tube wiring reports.

Momentum and share analysis

Download the calculations (CSV)

Findings to track

1. Insurers prevailed in 9 of 13 Florida appellate opinions (69.2%) on homeowner claims over failed cast iron drain pipes, 2017 to 2026.^[1]
2. Homeowners prevailed in 2 opinions (Vazquez, 2022; Stewart, 2026) and 2 were mixed (Feltes, 2024; Karmo, 2026).^{[6][15][11][14]}
3. Of 8 appellate rulings on tear-out cost in Florida cast iron cases, 6 (75.0%) favored the insurer.^[1]
4. Twelve of the 13 opinions (92.3%) were filed from 2021 to 2026; the earliest is Maspons (Third DCA, 2017).^[1][3]
5. The median gap between the stated loss year and the appellate opinion was 7 years across 7 Florida cases.^[1]
6. In Banks (Third DCA, 2023) a $113,318.17 appraisal award, 11.3 times the $10,000 endorsement cap, was reversed.^[8]
7. In Karmo (First DCA, 2026) the $335,000 replacement cost verdict was 4.2 times the only admitted estimate of $79,680.22.^[14]
8. In Gunsser (Sixth DCA, 2023) the water damage exclusion carried a $151 premium credit and the buy-back a $91 premium.^[9]
9. The Maspons drain (Miami-Dade) failed 53 years after the 1957 build; the Feltes drain (Lee County) overflowed 57 years after the 1961 build.^[3][11]
10. Florida's notice deadline for a property claim fell from 2 years (from 2021-07-01) to 1 year (from 2022-12-16); supplemental claims fell from 3 years to 18 months.^[24][21]
11. Citizens requires a 4-point inspection for Florida homes over 20 years old, down from 30, and its March 2025 form lists cast iron drains.^[33][32]
12. The US cast iron soil pipe PPI rose 94.9% from January 2020 to September 2026; plastic DWV pipe rose 47.0%.^[16][17]
13. Florida had 3.0 million housing units built from 1950 to 1979 in 2025, 27.8% of its stock, against 31.9% nationally.^[19]

Frequently asked questions

Related guides, services and research

• Small bathroom remodel cost
• Remodelers by city
• How Long Do Ovens Last? Gas, Electric and the Federal Recall Record
• How Long Do Refrigerators Last? DOE Lifespan Data and the Age of US Fridges
• How Long Do Toilets Last? Flush Rules, Breakdowns and Parts
• How Long Do Water Softeners Last? Resin, Valves and the Hardness Factor
• All kitchen and bath research

Reproduce this analysis

Every figure comes from the files below. The scripts that pulled and computed them are kept with the report and can be re-run.

Data quality and exclusions

• Official index: 30 hits read; 17 excluded as not homeowner cast iron drain insurance claims (5 criminal cases including two duplicates, 7 that only cite American Cast Iron Pipe Co. or a case against it, 2 duplicate filings of one construction case, and 3 other cases including a plumber's suit against insurers' lawyers).
• CourtListener: 46 opinions across four queries; 1 withdrawn duplicate (Banks, 2023-08-16) merged; 1 in-scope case (Vazquez) missing from the feed and taken from the official index.
• PPI: 23 months of WPU10150227 (November 2021 to September 2023) are not published by BLS and are left blank, not interpolated; the September 2026 values and the three months before carry the BLS preliminary flag.
• PPI: 7 annual-average rows (period M13) per series dropped before computing changes.
• Feltes tear-out verdict recorded as 60,000 because the opinion says only 'nearly $60,000'; Karmo insurer figures recorded as 12,000 and 7,000 from 'a little more than' and 'just over'.

Methodology

Selection: KBR queried the Florida State Courts System's public opinion search for opinions whose text contains "cast iron" across the Supreme Court and all six District Courts of Appeal on 2026-11-08 (30 hits; the hyphenated query returned the same 30). Every hit was downloaded as the official PDF and read. A parallel search of CourtListener's public feed with four queries returned 46 Florida opinions and found 12 of the 13 in-scope cases.

Inclusion: an opinion is in scope if it decides a homeowner's property insurance claim in which failure of a cast iron drain or sewer pipe is the loss. Seventeen hits were excluded: criminal cases, contract cases and citations to the company American Cast Iron Pipe. The Third District's withdrawn Banks opinion of 2023-08-16 was merged into its replacement.

Coding: each opinion was coded for appellant, disposition, primary issue (tear-out coverage; water exclusion and $10,000 cap; procedure, fees or damages), the side that prevailed on appeal, and the tear-out ruling where one was made. Partial outcomes were coded mixed. Coding is in tables/registry.csv with a link to each official PDF.

Prices: BLS PPI flat files were read for WPU10150227 (cast iron soil pipe and fittings except ductile pressure pipe), WPU101502 (all cast iron pressure and soil pipe), PCU32612232612211 (plastics drain, waste and vent pipe) and PCU3261223261221 (all plastics pipe), January 2020 to September 2026, released 2026-10-15. Indexes were rebased to January 2020 = 100. Annual averages (M13) were dropped.

Housing: ACS 2025 1-year table B25034 was read from the shared table-based summary file for Florida and the United States.

Conflicts: where lifespan figures conflict, all are shown with the source type rather than averaged. No numeric lifespan from a government table was available (see excluded.md).

Last update: 2026-11-08. The registry is re-searched monthly; prices update with each BLS release.

This report presents published data with its limitations. It is not legal, financial or investment advice.

Sources, ranked by quality

Tier 1: primary and official sources (33)

• [1] Florida State Courts System. Florida Courts opinion search, full-text query "cast iron", Supreme Court and six District Courts of Appeal. Opinions indexed through 2026-11-08. Accessed 2026-11-08.
• [3] Florida 3rd District Court of Appeal. Homeowners Choice Prop. & Cas. Ins. Co. v. Maspons, No. 14-1310 (Fla. 3rd DCA, 2017-01-18), official opinion PDF. Opinion filed 2017-01-18. Accessed 2026-11-08.
• [4] Florida 1st District Court of Appeal. State Farm Florida Ins. Co. v. Nordin, No. 20-1280 (Fla. 1st DCA, 2021-02-24), official opinion PDF. Opinion filed 2021-02-24. Accessed 2026-11-08.
• [5] Florida 4th District Court of Appeal. Dodge v. People's Trust Ins. Co., No. 20-1199 (Fla. 4th DCA, 2021-06-02), official opinion PDF. Opinion filed 2021-06-02. Accessed 2026-11-08.
• [6] Florida 5th District Court of Appeal. Security First Ins. Co. v. Vazquez, No. 20-2528 (Fla. 5th DCA, 2022-02-18), official opinion PDF. Opinion filed 2022-02-18. Accessed 2026-11-08.
• [7] Florida 5th District Court of Appeal. Rosa v. Safepoint Ins. Co., No. 21-3005 (Fla. 5th DCA, 2022-11-14), official opinion PDF. Opinion filed 2022-11-14. Accessed 2026-11-08.
• [8] Florida 3rd District Court of Appeal. People's Trust Ins. Co. v. Banks, No. 2022-1436 (Fla. 3rd DCA, 2023-09-13), official opinion PDF. Opinion filed 2023-09-13. Accessed 2026-11-08.
• [9] Florida 6th District Court of Appeal. People's Trust Ins. Co. v. Gunsser, No. 2023-0492 (Fla. 6th DCA, 2023-11-09), official opinion PDF. Opinion filed 2023-11-09. Accessed 2026-11-08.
• [10] Florida 5th District Court of Appeal. People's Trust Ins. Co. v. Diaz, No. 2022-1006 (Fla. 5th DCA, 2023-12-01), official opinion PDF. Opinion filed 2023-12-01. Accessed 2026-11-08.
• [11] Florida 6th District Court of Appeal. State Farm Florida Ins. Co. v. Feltes, No. 2023-0991 (Fla. 6th DCA, 2024-11-27), official opinion PDF. Opinion filed 2024-11-27. Accessed 2026-11-08.
• [12] Florida 3rd District Court of Appeal. Koss v. Florida Ins. Guaranty Ass'n, No. 2021-1904 (Fla. 3rd DCA, 2025-04-09), official opinion PDF. Opinion filed 2025-04-09. Accessed 2026-11-08.
• [13] Florida 2nd District Court of Appeal. Stevens v. Florida Peninsula Ins. Co., No. 2024-0253 (Fla. 2nd DCA, 2025-08-29), official opinion PDF. Opinion filed 2025-08-29. Accessed 2026-11-08.
• [14] Florida 1st District Court of Appeal. Universal Prop. & Cas. Ins. Co. v. Karmo, No. 2024-3259 (Fla. 1st DCA, 2026-07-22), official opinion PDF. Opinion filed 2026-07-22. Accessed 2026-11-08.
• [15] Florida 2nd District Court of Appeal. Stewart v. Universal Prop. & Cas. Ins. Co., No. 2025-1914 (Fla. 2nd DCA, 2026-09-25), official opinion PDF. Opinion filed 2026-09-25. Accessed 2026-11-08.
• [16] U.S. Bureau of Labor Statistics. Producer Price Index flat file wp.data.11a.Metals10-103 (series WPU10150227, WPU101502). Monthly, January 2020 to September 2026 (latest four months preliminary). Accessed 2026-11-08.
• [17] U.S. Bureau of Labor Statistics. Producer Price Index flat file pc.data.15.PlasticsRubberProducts (series PCU32612232612211, PCU3261223261221). Monthly, January 2020 to September 2026 (latest four months preliminary). Accessed 2026-11-08.
• [18] U.S. Bureau of Labor Statistics. Schedule of Releases for the Producer Price Index. 2026 to 2027 schedule. Accessed 2026-11-08.
• [19] U.S. Census Bureau. American Community Survey 2025 1-year, table B25034 Year Structure Built (table-based summary file). 2025. Accessed 2026-11-08.
• [20] U.S. Census Bureau. 2025 ACS Data Release Schedule (updated October 29, 2026). 2025 releases. Accessed 2026-11-08.
• [21] The Florida Legislature (Online Sunshine). Florida Statutes s. 627.70132, Notice of property insurance claim. 2026 Florida Statutes. Accessed 2026-11-08.
• [22] The Florida Legislature (Online Sunshine). Florida Statutes s. 627.7152, Assignment agreements. 2026 Florida Statutes. Accessed 2026-11-08.
• [23] The Florida Legislature (Online Sunshine). Florida Statutes s. 627.70152, Suits arising under a property insurance policy. 2026 Florida Statutes. Accessed 2026-11-08.
• [24] Florida Department of State. Laws of Florida ch. 2021-77 (CS/CS/CS/SB 76, Insurance). Approved 2021-06-14, effective 2021-07-01. Accessed 2026-11-08.
• [25] Florida Department of State. Laws of Florida ch. 2022-268 (CS/SB 2-D, Property Insurance). Effective 2022-05-26 except as provided. Accessed 2026-11-08.
• [26] Florida Department of State. Laws of Florida ch. 2022-271 (SB 2-A, Property Insurance). Effective 2022-12-16 except as provided. Accessed 2026-11-08.
• [27] Florida Department of State. Laws of Florida ch. 2023-15 (CS/CS/HB 837, Civil Remedies). Effective 2023-03-24. Accessed 2026-11-08.
• [28] The Florida Senate. CS/CS/CS/SB 76 (2021) bill history. 2021 Regular Session. Accessed 2026-11-08.
• [29] The Florida Senate. CS/SB 2-D (2022 Special Session D) bill history. 2022 Special Session D. Accessed 2026-11-08.
• [30] The Florida Senate. SB 2-A (2022 Special Session A) bill history. 2022 Special Session A. Accessed 2026-11-08.
• [31] The Florida Senate. CS/CS/HB 837 (2023) bill history. 2023 Regular Session. Accessed 2026-11-08.
• [32] Citizens Property Insurance Corporation. 4-Point Inspection Form, Insp4pt 03 25. Form version March 2025. Accessed 2026-11-08.
• [33] Citizens Property Insurance Corporation. 2022 Rates and Rules Changes Including 4-Point Required for 20+ Year Buildings (agent bulletin). Bulletin dated 2021-12-03. Accessed 2026-11-08.
• [34] National Bureau of Standards (now NIST). Underground Corrosion, NBS Circular 579 (Romanoff). Field burial tests 1922 to 1950s, issued April 1957. Accessed 2026-11-08.

Tier 2: trade bodies, market research, company data (3)

• [2] Free Law Project. CourtListener opinion search feed, Florida Supreme Court and District Courts of Appeal. Opinions indexed through 2026-11-08. Accessed 2026-11-08.
• [35] Cast Iron Soil Pipe Institute (manufacturers' association). Cast Iron Soil Pipe and Fittings Handbook (twelfth printing 2006), trade body handbook. 2006 printing, posted 2026. Accessed 2026-11-08.
• [36] Cast Iron Soil Pipe Institute (manufacturers' association). Circularity (cast iron soil pipe recycled content). Undated web page. Accessed 2026-11-08.

Tier 3: journalism and expert commentary (2)

• [37] Florin Roebig (law firm). Cast Iron Pipe Insurance Claims (law firm practice page). Undated web page. Accessed 2026-11-08.
• [38] Repipe Specialists (plumbing contractor). How Long Do Cast Iron Sewer Pipes Last? (contractor article). Published 2025-01-31. Accessed 2026-11-08.