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Mold Disclosure When Selling a Home: What the Law Says

Last updated October 25, 2026

The short answer

What Mold Disclosure Means

When selling a home, you are generally required to tell buyers about known issues that affect the property's value or safety. Mold can be one of those issues. In Washington, the seller's disclosure statement asks about water damage and other conditions, but it may not specifically mention mold.

If you have seen mold or know about past water problems that led to mold, you should disclose that information. Failing to do so can lead to legal trouble after the sale. Buyers may sue for nondisclosure if they discover mold later and believe you hid it.

Washington State Rules

Washington law requires sellers to complete a disclosure statement that covers various aspects of the property. This form includes questions about water intrusion, flooding, and other damage. Mold is not always a separate question, but water damage often leads to mold, so you must be honest about any past leaks.

If you are unsure whether a past issue counts as a disclosure, err on the side of honesty. You can also check your state's real estate commission website for the latest forms. Policies vary, and your insurer decides what is covered, so review your policy if you have questions about liability.

  • Disclose any visible mold you have seen
  • Disclose past water leaks or flooding
  • Disclose any repairs you made for water damage
  • Disclose if you never fixed a leak but know it happened
  • Disclose if you treated mold yourself with bleach or other products
  • When in doubt, disclose more rather than less

How to Disclose Mold

The right way to disclose mold is in writing, using the seller's disclosure form. You can add a note in the comments section if the form does not have a specific mold question. Be specific about where the mold was, what caused it, and what you did to fix it.

If you have not fixed the mold, say so. You might also include a professional inspection report if you have one. Even if you think the mold is gone, disclosing the history is safer. Buyers appreciate honesty, and it can protect you from future claims.

What If You Don't Know?

You can only disclose what you know. If you have never seen mold or water damage, you are not expected to guess. However, if you suspect a problem, such as a musty smell or stains on the ceiling, you may want to investigate before selling.

A mold professional can test and identify mold. You can also hire a home inspector to check for hidden issues. If you find mold, you can either treat it or disclose it. If you choose to treat it, keep records of what you did.

Risks of Nondisclosure

Not disclosing known mold can lead to a lawsuit after the sale. The buyer may claim you committed fraud or misrepresentation. You could be responsible for the cost of mold removal and other damages. In some cases, the sale could even be rescinded.

To protect yourself, always be honest on the disclosure form. If you are unsure about your obligations, check your policy or talk to a real estate professional. In Sammamish, as elsewhere, it is better to disclose than to risk a legal dispute.

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Frequently asked questions

Do I need to disclose mold if I fixed it?

Yes, you should disclose past mold even if you fixed it. Buyers have a right to know about the history. If you did repairs, describe what you did and include any receipts or inspection reports.

What if I never saw mold but had a leak?

You should disclose the leak, because water damage can lead to mold. Even if you did not see mold, the leak is a material fact. Be honest about the leak and any repairs.

Can a buyer sue me after closing for mold?

Yes, if you knew about mold and did not disclose it. The buyer may claim you hid a defect. To avoid this, always disclose known issues. If you are unsure, consult a real estate attorney.

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