Clay Soil, Radon, and What Utah Sellers Are Required to Disclose

Utah has a few environmental realities that come up regularly in real estate, expansive clay soil, elevated radon levels in parts of the state, and increasing conversations around wildfire and insurance. Here is what you are actually required to disclose about each one, and what remains genuinely optional.

Do I Have to Disclose Radon If I Have Not Tested

No, Utah does not require you to test for radon before selling. There is no mandatory testing law. What is required is that if you have tested, or if you already know about elevated radon levels for any other reason, that information must be disclosed. You cannot test, get a bad result, and then simply not mention it. If you have never tested, you generally have nothing specific to disclose on that point, though buyers frequently choose to test during their own inspection period regardless.

What Radon Level Actually Matters

The EPA's action level is 4.0 picocuries per liter. Results below that are generally considered acceptable, and the standard recommendation is to retest every two years. Results at or above that level typically lead to a conversation about mitigation, which is a system installed to vent radon safely out of the home, generally costing a modest amount depending on the home's foundation and size. If a buyer tests during their inspection period and results come back elevated, this becomes part of negotiation rather than something that kills the deal outright.

Is Expansive Clay Soil Something I Have to Disclose

Utah does not have a distinct legal category specifically for soil disclosure the way it does for radon. What matters is whether you have actual knowledge of a problem caused by soil movement, such as foundation cracking, settling, or drainage issues tied to expansive clay. If you know your home has experienced this kind of issue, it falls under the same general material defect disclosure obligation that covers any known problem affecting the property's value or safety. If you are not aware of any such issue, there is nothing specific to disclose on this point beyond normal honesty about what you know.

What About Wildfire Risk and Insurance

Utah does not currently have a dedicated wildfire zone disclosure law the way some other states do. That said, wildfire smoke and insurance availability have become a more practical concern in parts of the state in recent years, and if you are aware of specific issues, such as a prior insurance claim, a lapse in coverage, or difficulty obtaining insurance tied to the property's location, that kind of known material information generally falls under the same broad disclosure duty as any other known issue affecting the property.

What Is the General Rule I Should Follow

If you know something specific and real about your property that could reasonably affect its value or safety, disclose it, regardless of which category it technically falls into. Utah's disclosure standard is built around actual knowledge, not an obligation to investigate things you do not already know. The risk is never in disclosing too much, it is in staying quiet about something you genuinely know and having it surface later.

I tell every seller the same thing on this topic, when in doubt, write it down. A disclosed issue becomes part of a normal negotiation. An undisclosed issue that surfaces after closing becomes a legal problem, and that is a much worse outcome than a slightly harder conversation now.

Frequently Asked Questions

Do I have to test my home for radon before selling in Utah

No, radon testing is not mandatory in Utah. You only have to disclose results if you have already tested or otherwise know about an issue.

What radon level is considered a problem

The EPA action level is 4.0 picocuries per liter. Results at or above that level typically lead to a conversation about mitigation.

Do I have to disclose clay soil issues even without a formal law requiring it

If you have actual knowledge of a soil-related problem like foundation cracking or settling, it falls under Utah's general material defect disclosure requirement.

Is there a specific wildfire disclosure law in Utah

Not a dedicated one like some other states have, but known issues tied to wildfire risk, such as insurance claims or coverage problems, generally still fall under general disclosure duties.

What is the safest approach for a seller unsure about disclosure

If you know something specific and real about the property, disclose it. The obligation is based on actual knowledge, not a duty to investigate unknown issues.

If you have questions about disclosure on your specific home before listing, you can get an idea of your home value at danarealtorutah.com/evaluation. To talk through your situation directly, call or text me at 801-636-3609.