Can you sell a house with mold in Illinois?

People search for "Illinois mold disclosure law" and find a lot of confident pages. Here is what the statutes actually contain. The Residential Real Property Disclosure Act, which governs what a seller of a one-to-four-unit home tells a buyer, does not use the word mold anywhere in its disclosure report. The Illinois statute written about mold, the Mold Remediation Registration Act, is a law about the people who perform mold remediation; it puts no duty on a homeowner selling a house.

So no Illinois statute requires a seller to have a house tested for mold, to hire anyone to remove it, or to answer a yes-or-no question about it. What the Disclosure Act does require is honesty about water and about material defects you actually know of, which is where mold usually lives. Local codes are separate: if your city has sent a notice about the house, the form has an item for that. The next section walks through the form item by item.

If you're a seller the Act covers, you complete every item in the state's disclosure report and deliver it to the buyer before the contract is signed. The form is a list of statements you mark yes, no, or not applicable. The ones that touch mold's causes are these:

• I am aware of flooding or recurring leakage problems in the crawl space or basement.
• I am aware that the property is located in a floodplain.
• I am aware of material defects in the basement or foundation (including cracks and bulges).
• I am aware of leaks or material defects in the roof, ceilings, or chimney.
• I am aware of material defects in the walls, windows, doors, or floors.
• I am aware of material defects in the plumbing system (the form lists the water heater, sump pump, water treatment system, sprinkler system, and swimming pool among the things it includes).
• I am aware of material defects in the heating, air conditioning, or ventilating systems.
• I have received notice of violation of local, state or federal laws or regulations relating to this property, which violation has not been corrected.

Two definitions on the form decide how you answer. "Aware" means to have actual notice or actual knowledge without any specific investigation or inquiry. "Material defect" means a condition that would have a substantial adverse effect on the value of the residential real property or that would significantly impair the health or safety of future occupants, unless the seller reasonably believes the condition has been corrected.

The Act then says it plainly: the seller shall disclose material defects of which the seller has actual knowledge, and the seller is not obligated by the Act to make any specific investigation or inquiry to complete the report. A seller isn't liable for an error or omission the seller had no knowledge of, or that rested on a reasonable belief that a defect had been corrected, or that came from a public agency or a licensed professional's information the seller had no reason to doubt.

Put together, that means: the leak you know about goes on the form, in the item for the roof, basement, or plumbing it came from, and the form says that for any statement answered yes or not applicable, the seller provides an explanation in its additional information area. Whether a particular patch of mold is itself a material defect under that definition is a question for your attorney, not for a buyer, and not for this page. Our guide on what to disclose when selling a house in Illinois covers the rest of the report.

Some sellers are exempt from the Act altogether, including a fiduciary administering a decedent's estate, guardianship, conservatorship, or trust, and a seller in a transfer ordered by a court. The exemption covers the form, not the conversation; tell any buyer what you know.

No Illinois statute requires a seller to test. The Illinois Department of Public Health's mold page says that no standards or guidelines exist to judge acceptable mold levels, that IDPH does not license individuals to perform mold assessments or testing, and that generally IDPH does not recommend mold testing. The EPA's guide says that in most cases, if visible mold growth is present, sampling is unnecessary.

A buyer who wants a test can order one. If you've already had the house tested, the results are now something you know; ask your attorney how the Act's knowledge rule applies to a report you hold.

No Illinois statute makes a seller remove mold before a sale. A seller who lists may choose to, because a financed buyer's lender, appraiser, or insurer may raise it, and because a listed house competes with dry ones. That is a market choice, not a legal duty.

If you do hire a remediator, the Mold Remediation Registration Act is the statute that applies to them. It defines mold as any form of multicellular fungi found in water-damaged indoor environments or water-damaged building materials, and mold remediation as the removal, cleaning, sanitizing, demolition, or other treatment of mold in buildings, including preventive activities. It directs the Department of Public Health to adopt rules for a program under which parties that provide mold remediation services register with the State and provide evidence of an active third-party certification and of financial responsibility. The Act names the Institute of Inspection Cleaning and Restoration Certification and the National Organization of Remediators and Microbial Inspectors as third-party certifiers, along with other national nonprofits the Department approves. Home builders and remodelers working on a house of four or fewer units under its written warranty are exempt.

As of this writing, IDPH's own page says the new requirements for mold remediation registration will not be in effect until the adoption of pending rulemaking, that its proposed rules were published in the Illinois Register on October 17, 2025, and that until adoption of rules, mold remediation professionals are not required to register with IDPH. IDPH also says it cannot recommend the services of any contractor. So the practical question to ask any remediator today is what third-party certification they hold, and to keep their report and invoice: once the work is done, those documents are part of what you know about the house.

This is guidance, not law, and it's the EPA's, not ours. The EPA says the key to mold control is moisture control, and that it is impossible to get rid of all mold and mold spores indoors; the point is to stop the water. It says to fix plumbing leaks and other water problems as soon as possible and to dry everything completely.

On the size of the job, the EPA says that if the moldy area is less than about 10 square feet, homeowners can usually handle the cleanup themselves, and that larger areas or heavy water damage call for its guide for professionals; IDPH's page says a professional mold remediator should clean up areas of mold growth larger than 10 square feet. On materials, the EPA says absorbent or porous materials, such as ceiling tiles and carpet, may have to be thrown away if they become moldy. On what you can't see, it says mold may be hidden in places such as the back side of drywall, wallpaper, or paneling, and that if you believe you may have a hidden mold problem, consider hiring an experienced professional.

For a seller, the useful part is the first sentence. A buyer looking at a house with mold is really looking at a water problem: a roof, a grade, a sump pump, a pipe, a bathroom fan. Knowing where the water came from, and whether it's still coming, is worth more to the conversation than any test.

We buy houses as they stand, mold included, and no testing, remediation, or cleanup is required to get a written offer. That's the whole arrangement on our page about selling a house that needs repairs: tell us what you know, we look at what can be safely seen, and the offer reflects the work ahead. If the mold came from a burst pipe, a flooded basement, or firefighting water, our fire and water damage page covers the insurance questions that come first.

What we'll ask: where the water came from, whether it's stopped, how long it ran, what's been done since, and whether anyone has tested or written anything up. What we won't do: tell you the mold is harmless, tell you it's dangerous, or tell you what remediation would cost. We're a buyer, not an inspector, a remediator, or a doctor.

The trade-off is the same as any as-is sale. A cash offer on a house with an active water problem is below what the same house would list for once it's dried out and repaired, and it's one written number you can weigh against the cost, time, and uncertainty of fixing it yourself. If the water is still coming in, say so first; a house that's drying is a different conversation from one that's still wet.