Can Old Plumbing Get Your California Home Insurance Non-Renewed?

Updated 2026-08-31 · Plumber Comparator editorial team

Ask around and you'll hear it as folklore: "they'll drop you if you still have galvanized." Ask an insurer to confirm it in writing and you get nothing. Both experiences are real, and the reason for the gap is a specific California statute. Here is what can actually be verified about old plumbing and homeowners insurance in this state — the law, the numbers, and the parts nobody can document.

Why you can't find the list of banned pipe materials in California

In other states, insurer underwriting guidelines are public records, and they name materials outright. Florida's Citizens Property Insurance won't write dwellings over 20 years old with polybutylene. A Texas carrier lists "risks with galvanized or Polybutylene plumbing" as ineligible. Those documents are easy to find because those states publish them.

California is different. Underwriting guidelines here are largely confidential under Insurance Code section 1861.05(b), so there is no public list to check. That absence is not evidence that California carriers don't care about plumbing — it's evidence that you can't audit the rule from outside.

One California guideline is public, though, because a news organization obtained and posted it: the homeowner underwriting guidelines for California Automobile Insurance Company (a Mercury Insurance Group company), 2018 edition. It states that electrical wiring, plumbing and heating systems "must be updated within the last 50 years," and that the agent "may not bind coverage if the home requires major repairs related to the foundation, pipe corrosion, water leakage, plumbing, electrical systems, or other serious problems." Note the shape of that rule: it's about age and condition, not a banned-materials list. That's the realistic model for how California carriers approach it.

The state's own regulator studied this once, in 2004, and found that 41% of surveyed companies placed limitations or exclusions on water damage, 36% had water-loss exclusions, and a quarter asked about water losses on the application. It's an old study — cite it as a 2004 snapshot, not current practice — but it tells you the concern is long-standing.

Why water damage is the underwriting story

Because the claims are frequent and expensive. Insurance industry data compiled by the Insurance Information Institute from ISO/Verisk figures put water damage and freezing at 27.6% of homeowners claims in 2022, with an average claim severity of $13,954 across 2018–2022 — second only to wind and hail by frequency. Old supply lines are, from an underwriter's seat, a frequency problem rather than a catastrophe problem.

And it isn't only the obviously obsolete materials. A 2009 study by Farooqi and colleagues in the Journal of Water Resources Planning and Management analyzed a US database of copper pipe failures, documented premature failures with strong regional clustering, and explicitly listed higher home insurance costs and reduced property value among the consequences to homeowners (study on Google Scholar). A 2021 review by Gibson and Karney in AWWA Water Science put the scale at roughly 750,000 pinhole leaks a year in the United States and concluded the mechanisms are still not well understood (study on Google Scholar). Insurers are increasingly modelling this at the individual building level: a 2023 study by Heinrich-Mertsching and colleagues in the Journal of the Royal Statistical Society Series C used real insurance claim data to build a building-specific water-damage risk score from building attributes plus climate and topography (study on Google Scholar).

What California law actually lets an insurer do

This is the part worth getting exactly right, because the commonly repeated numbers are out of date.

• Non-renewal: 75 days' notice. Insurance Code section 678(c)(1) requires 75 days' advance notice of non-renewal for policies expiring on or after July 1, 2020. If the insurer misses it, the existing policy stays in effect, unchanged, for 75 days from when the notice is delivered. Many articles still say "45 days" — that's the pre-2020 rule. Section 678(a) separately requires the insurer to deliver either a renewal offer or a non-renewal notice 45 days before expiration.
• Mid-term cancellation: only five grounds. After 60 days in force, section 676 permits cancellation only for nonpayment, certain convictions, fraud or material misrepresentation, grossly negligent acts, or "physical changes in the insured property which result in the property becoming uninsurable." Notice is 20 days (10 for nonpayment or fraud). Aging pipes are not a mid-term cancellation ground — the realistic insurer move is non-renewal at expiry.
• The wildfire moratorium doesn't help here. Section 675.1 bars non-renewal for a year after a declared wildfire emergency in affected ZIP codes — but only where the non-renewal is based on wildfire risk. The current example is CDI Bulletin 2026-6, issued August 14, 2026 for the Gann Fire in Calaveras County. A plumbing-based non-renewal is outside that protection entirely.
• Pending, not law: SB 1301 would extend non-renewal notice to 90 days from 2028 and give homeowners 90 days to remediate a curable underwriting problem. As of late August 2026 it is still moving through the Legislature. Don't plan around it.

The FAIR Plan is not the backstop people assume

This is the most important correction in this article. The California FAIR Plan is the market of last resort for homeowners who can't get coverage — but it covers fire, lightning, internal explosion and smoke, with optional extended coverage for wind, hail and similar perils. It does not cover water damage, liability or theft. The Department of Insurance says so plainly.

Which means: if you are non-renewed over plumbing, the FAIR Plan does not solve your problem, because the peril you just lost coverage for is the one the FAIR Plan excludes. Restoring water coverage requires a Difference in Conditions policy alongside it, from a carrier that underwrites you independently — so the plumbing question follows you. (For context on the FAIR Plan's own condition: its exposure reached $724 billion by December 2025 across roughly 669,000 policies, and a $1 billion member assessment was approved in February 2025.)

What a homeowner can realistically do

• Pull your CLUE report. The Comprehensive Loss Underwriting Exchange, run by LexisNexis, holds seven years of claims history drawn from the large majority of homeowners insurers — date of loss, cause, amounts paid. You're entitled to a free copy once every 12 months. Two water claims you'd half-forgotten are exactly what a renewal underwriter is looking at.
• Think hard before filing a small water claim. A $3,000 claim that contributes to a non-renewal is expensive in a way the check doesn't show. Our guide to water damage insurance claims in California covers the tradeoff.
• Document a repipe properly. No insurer, and no CDI publication, documents a "send us your repipe invoice and get a discount" program — every claim to that effect traces back to repipe contractor marketing. What is documented is that at least one California guideline conditions eligibility on plumbing updated within 50 years and on the absence of pipe corrosion, and that CDI has stated the principle that there must be a provable causal connection between past claims and future risk — a full repipe logically reduces assessed risk the way a new roof does. So keep the permit, the final inspection sign-off, dated photos and the invoice, and give them to your agent at renewal. That's reasoning from documented criteria, not a promised discount.
• Look at leak detection devices — these discounts are real and documented in California. Mercury publishes savings of roughly $75 a year for a monitoring device and about $100 for a qualifying device with automatic shutoff, on HO-3 policies including in California. Nationwide's partnership with Phyn offers 15% off the hardware (a product discount, not a premium cut) and launched in California first. Our smart leak detector and automatic shutoff guide covers what the devices cost and what they actually do.
• Ignore the "California requires a 4-point inspection" claim. The four-point inspection is a Florida and Gulf Coast convention. Every assertion that California carriers require one traces back to inspection companies selling them. California's equivalent is a carrier-ordered underwriting inspection at new business or renewal — which can absolutely result in a repair condition, as the Mercury guideline shows.
• If you're non-renewed, you can file a Request for Assistance with the California Department of Insurance. It won't force a carrier to write you, but it creates a record and sometimes surfaces an error.

If you're planning around a renewal date

The sequence that works: find out what you actually have (galvanized supply lines, polybutylene, original copper, cast iron drains — our guides to polybutylene and galvanized pipe and cast iron drain replacement describe how to identify each), get a written scope and price, and time the work so the permit is finaled before the renewal, not after. Our repipe cost guide and the repiping cost page give the planning ranges; note that copper material costs moved sharply in 2026, which our guide on copper prices and repipe quotes covers.

If a carrier has raised a plumbing question, or you already know the pipes are on borrowed time, get comparable bids before the clock runs out. Describe the house and the pipe material on Plumber Comparator and request a free quote — plumbers in Long Beach, Pasadena and across California handle insurance-driven repipes regularly and know what documentation to leave you with.

Keep reading

• Can Your Water Be Shut Off in California for an Unpaid Bill?
• After You Fix a Leak, Ask for a Leak Adjustment: How California Water Bill Credits Work
• How Long Is a Plumber’s Work Guaranteed in California?