What Is a Radon Gas Disclosure in Real Estate?

A radon gas disclosure is a document sellers provide to buyers informing them of any known radon testing or results on a property. Radon is a naturally occurring radioactive gas that can enter homes from the soil and pose health risks. Many states require disclosure of known radon hazards or test results during a home sale.

đź’¨ What Is Radon and Why It Matters

Radon is a colorless, odorless gas produced by the natural breakdown of uranium in soil and rock. When trapped inside homes, it can build up to unsafe levels and increase the risk of lung cancer with long-term exposure. The U.S. Environmental Protection Agency (EPA) considers radon levels above 4.0 pCi/L to be potentially hazardous.

Because radon has no smell or taste, testing is the only way to detect it. That’s why radon awareness and disclosure have become a key part of real estate transactions—especially in areas with high radon potential.

đź“ś Radon Disclosure Requirements for Sellers

Depending on the state, sellers may be legally required to provide a radon gas disclosure form as part of the standard property disclosure packet. This typically includes:

  • Whether the property has been tested for radon
  • The date and results of any radon test performed
  • Whether mitigation or remediation has been completed
  • Any radon system currently installed in the home

Even if not legally required, providing this information builds trust with buyers and helps prevent issues during the inspection period.

🤝 Buyer and Seller Responsibilities

Sellers must disclose known radon information in good faith. Buyers, on the other hand, usually have the right to request a radon inspection as part of their due diligence. If high levels are found, the parties can negotiate remediation or credits before closing.

Installing a radon mitigation system is often a simple process that significantly lowers radon levels and protects both health and property value.

🏡 FSBO Tip for Brokerless Sellers

If you’re selling your home For Sale by Owner (FSBO), you can include your radon disclosure along with your other property documents when listing on the MLS through Brokerless. This ensures compliance with local regulations and shows transparency to potential buyers.

If you’re selling your home For Sale by Owner (FSBO), you can include your radon disclosure along with your other property documents when listing on the MLS through Brokerless. This ensures compliance with local regulations and shows transparency to potential buyers. You can also review our guide on lead-based paint disclosures for a similar federal requirement.