Mold Disclosure When Selling a House: State-by-State Guide

Most states require home sellers to disclose known mold and known water damage on the residential property disclosure form. There is no federal mold disclosure law, but the duty to disclose "material defects" — which includes visible mold, prior mold remediation, and prior test results — applies in almost every state. The word that controls everything is known. Sellers don't have to disclose mold they don't know about. They do have to disclose mold they've seen, mold they've paid to clean, mold a contractor mentioned, or water damage that anyone reasonable would expect to grow mold. "As-is" sales do not waive that duty in most states.

This guide covers the federal baseline, the six biggest state markets (California, Texas, Florida, New York, Washington, Georgia), what "known" actually means, and when a pre-listing mold inspection is worth the cost — written by the Fast Mold Testing editorial team in collaboration with the certified inspectors on our partner network. We test. We don't remediate. That means the report is yours, the recommendation isn't a sales pitch, and the answer to "is there mold here?" is the same whether you sell next week or next year.

Do You Have to Disclose Mold When Selling a House?

Yes, almost always. Most U.S. states require sellers to disclose known material defects to buyers, though a handful of "caveat emptor" states (including Alabama and Arkansas) leave the burden largely on the buyer. A meaningful mold or water-damage problem is a material defect under every disclosure regime. Federal law adds one related disclosure — lead-based paint for pre-1978 homes — but mold itself is regulated state by state.

The disclosure obligation comes from two places. First, most states have a statutory residential property disclosure form the seller fills out before closing — California's Transfer Disclosure Statement, Texas's TREC Seller's Disclosure Notice, New York's Property Condition Disclosure Statement, and so on. These forms ask specific questions about water damage, leaks, and mold. Lying on them is fraud.

Second, even in the small number of states without a mandatory statutory form, common-law duty-to-disclose rules still apply when a seller knows about a defect a buyer couldn't reasonably discover on a walk-through. Florida's Johnson v. Davis line of cases is the canonical example: the seller knew, the buyer couldn't have known, the seller stayed quiet, the buyer won.

What federal disclosure rules require for residential property:

• Lead-based paint in homes built before 1978 (the only federally mandated property condition disclosure)
• Flood-hazard zone disclosures when the property is in a FEMA-designated zone (varies by state and lender)
• Lead, radon, and other environmental hazards as folded into state forms
• Property condition items the state form specifies

Mold sits inside category four. The federal government publishes mold guidance through the EPA, but the disclosure requirement itself is a state law question.

State-by-State Mold Disclosure Requirements

Disclosure rules vary by state, sometimes by a lot. The table below shows the disclosure form name and what each state's form requires sellers to say about mold, for the six states where most of FMT's pre-listing inspection bookings come from. Each state's full requirements live in the H3 sections that follow.

Washington and Georgia round out the six. Washington uses Form 17 with explicit water/mold questions; Georgia has no state-mandated form but follows a common-law duty similar to Florida's, with a heavily used Georgia Association of Realtors disclosure form most agents use anyway. Both are covered in their own H3 below.

California — Transfer Disclosure Statement (Civil Code §1102)

California requires sellers to complete the Transfer Disclosure Statement under Civil Code §1102. The TDS asks about water damage, drainage problems, and "any other material defect or condition" — which case law has consistently held includes known mold and known mold remediation. SB 655 (2015) classified visible mold as a substandard housing condition under the underlying habitability code (Health & Safety Code §§17920, 17920.3), effective 2016; while that statute is written for landlords, California listing agents treat it as the standard of care for sellers as well.

Practical guidance: if you've had mold remediated, list the date, the company, and any post-remediation clearance report. If you've seen mold and not remediated, disclose that too. The TDS allows attached documents — attach the inspection report rather than summarizing.

Texas — TREC Seller's Disclosure Notice (OP-H)

Texas requires sellers of residential property comprising not more than one dwelling unit to complete the TREC Seller's Disclosure Notice (Form OP-H) under Property Code §5.008. The form asks directly about active mold and previous mold remediation under its "Defects/Malfunctions" section, plus separate items for water penetration, plumbing leaks, and roof leaks.

Texas takes nondisclosure seriously. Buyers can sue for actual damages, mental anguish in some cases, and rescission of the sale. The Texas form is short and specific. There's no "I didn't think it counted" defense if you check "no" next to "prior mold remediation" and the buyer later finds the receipt.

Florida — No State Form, But Johnson v. Davis Controls

Florida is one of the rare states without a mandatory statutory disclosure form, but the Florida Supreme Court's Johnson v. Davis decision (1985) imposes a strong common-law duty: a seller must disclose any known material defect that the buyer couldn't reasonably discover. Mold, mold history, and water damage all fall inside that duty.

Most Florida transactions use the Florida Realtors/Florida Bar Seller's Property Disclosure form, which mirrors what California and Texas ask. The legal exposure is the same as in a statutory-form state. The only difference is that in Florida the duty is judge-made instead of legislature-made.

New York — Property Condition Disclosure Statement

New York requires sellers of one-to-four-unit residential property to deliver a Property Condition Disclosure Statement to the buyer before contract signing, under Real Property Law §462. The form asks about water leakage, flooding, drainage, and any "material defect" — categories that include mold.

A New York wrinkle: until 2024, a seller could opt out of the disclosure form by giving the buyer a $500 credit at closing. That opt-out was repealed. The PCDS is now mandatory, and the credit option no longer exists. Older listing-agent guidance still floating around the internet may say otherwise; it's out of date.

Washington — Form 17 (RCW 64.06)

Washington uses Form 17, the Seller Disclosure Statement, under RCW 64.06. Form 17 has explicit "moisture" and "mold" questions in its Structural section and again in its Systems section. Sellers must complete the form within five business days of mutual acceptance unless waived in writing.

Washington allows the buyer to rescind within three business days of receiving the disclosure if a material defect is revealed. Sellers who knowingly omit mold information lose that protection and open themselves to fraud claims under RCW 64.06.070.

Georgia — No State Form, GAR Form Is Standard

Georgia, like Florida, has no state-mandated disclosure form. The duty to disclose known defects comes from common law (the Wilhite v. Mays line of cases). In practice, almost every Georgia residential transaction uses the Georgia Association of Realtors Seller's Property Disclosure Statement, which asks about mold, water damage, prior remediation, and roof and plumbing leaks.

OCGA §10-1-393(b)(7) prohibits sellers from intentionally misrepresenting property condition. That's the statute a Georgia buyer's lawyer will cite if a nondisclosure suit becomes necessary, even though there's no checkbox form to point to.

What "As-Is" Actually Means (and Doesn't)

"As-is" is the most misunderstood clause in residential real estate. It means the seller will not make repairs, accept repair credits, or warrant any condition of the property after closing. It does not mean the seller can hide known defects.

The duty to disclose known material defects exists separately from the warranty disclaimers in the contract. California, Texas, New York, Washington, and the common-law states all treat as-is and disclosure as two different doctrines: the contract clause governs what the seller fixes; the disclosure form governs what the seller tells. An as-is seller who knows about basement mold and stays quiet is committing fraud. The as-is clause is no defense.

What as-is actually does: it shifts the cost of discovering defects to the buyer, which is why as-is buyers usually pay for an aggressive home inspection. The seller still has to answer the disclosure form truthfully. Anything outside the form — the leak from three winters ago that nobody mentioned, the mold the contractor noted in passing during the roof repair — still has to be on the form if it's known.

What Counts as "Known" Mold?

Mold is "known" if a reasonable seller in the same situation would have known about it. State courts read that test broadly. If you've ever seen mold, paid to remove it, had a contractor mention it, gotten a letter about it, or had water damage in the same spot, the answer is yes.

The disclosure triggers most courts have recognized:

• Visible mold anywhere in the home — basement walls, attic sheathing, bathroom ceilings, behind appliances, in HVAC vents
• Prior mold remediation, whether by a professional or by the seller, and even if "clearance testing" showed the area was clean after remediation
• Prior mold test results, including DIY kit results and any inspector's report
• Water-damage history — pipe leaks, roof leaks, basement flooding, hurricane damage, ice dams, slab leaks — that wasn't fully dried and tested
• Notices from an HOA, condo board, insurance carrier, or municipal inspector about moisture or mold
• Comments from a contractor, plumber, roofer, or general inspector that named mold or "potential mold"

The harder case: did the seller smell something musty in the laundry room and shrug? Some state courts read that as "should have known," especially when the buyer's later inspection finds active mold in that exact room. The conservative posture is the same one a real estate attorney will tell you — when in doubt, disclose.

Should You Test for Mold Before Listing?

A pre-listing mold inspection turns unknown-unknowns into priced-in knowns. That is the most reliable way to keep a deal from dying at the buyer's inspection contingency. Sellers who skip pre-listing testing find out about mold the same way the buyer does: from the buyer's inspector, a week before closing, with the negotiation leverage now on the buyer's side.

Three situations where a pre-listing test pays for itself:

• The home is over 30 years old and has had any water-related repair (roof, plumbing, basement waterproofing)
• A general home inspector or contractor has mentioned "musty smell" or "possible moisture" in any prior visit
• The local market favors buyers — buyers in a slow market shop hard for reasons to renegotiate, and an unexpected mold finding at the inspection stage is the most common one

A pre-listing mold inspection gives you three things the buyer's inspector won't give you. You get the report first, so you choose what to fix and what to disclose at your own pace. You get an independent lab result instead of a buyer's-inspector visual estimate. And the report is yours to attach to the disclosure form, which often defuses the buyer's inspection contingency before it becomes a negotiation.

We test. We don't remediate. That matters here because most companies that test for mold also sell the cleanup, meaning the same business that decides whether you have a mold problem also decides how big the cleanup project is. FMT's inspections start at our transparent rate, with lab results in 1-2 business days via our AI-assisted lab analysis, AIHA-LAP (EMLAP) accredited. The report goes to you; what you do with it is your choice. See what a mold inspection actually costs before you decide.

What Happens If You Don't Disclose Known Mold?

Buyers who discover undisclosed mold after closing have real remedies, and they use them. The most common are rescission of the sale, monetary damages for the cost of remediation and any related repairs, and attorneys' fees. A handful of states allow treble damages (three times actual damages) when nondisclosure is intentional fraud rather than honest oversight.

Statutes of limitations vary. California gives a buyer three years from discovery of the fraud, Texas gives four years, New York gives six years for fraud claims, Florida gives four years, Washington gives three years for fraud and six for written contracts, and Georgia gives four years for fraud. "Discovery" is often years after closing; mold behind drywall can stay hidden until a renovation pulls the wall open.

Real-world outcomes track a pattern. Buyers who can show the seller knew (an old remediation invoice, an HOA letter, a contractor's text message) win the easy cases. Sellers who can show they truthfully answered the form and disclosed what they actually knew win even when the buyer later finds something. The form is the document the case turns on; a complete, honest disclosure form is the cheapest insurance policy a seller can buy.

The Plain Summary

When in doubt, disclose. The disclosure form is the document every nondisclosure lawsuit turns on, and an honest, complete form is the cheapest protection a seller has. When you don't know what's actually in the property — past water damage, an old leak, that musty smell in the laundry room — the simplest fix is a pre-listing test so you can disclose facts instead of guesses.

Fast Mold Testing inspections are conflict-free: we test, we don't remediate, and the report is yours. Inspector visits are typically same-day or next business day across our 50+ service areas; lab results come back in 1-2 business days via our AI-assisted lab analysis, AIHA-LAP (EMLAP) accredited. The report goes on your seller's disclosure form before the buyer's inspector ever opens the basement door.