Radon Gas Requirements

Updated 2026-05-17

Radon is a naturally occurring radioactive gas that results from the decay of uranium in soil and rock. It is colorless, odorless, and tasteless, making it undetectable without specialized testing. Radon is the leading environmental cause of lung cancer deaths in the United States, with an estimated 21,000 fatalities annually. It can infiltrate homes through foundation cracks, pipe gaps, and porous concrete.

The Environmental Protection Agency (EPA) divides the U.S. into three radon zones based on the potential for elevated indoor radon levels. Zone 1 indicates the highest potential, but radon can be found in every state, emphasizing that testing is the only reliable method to determine its presence in a specific property.

VA Loan Requirements for Radon

For VA Loan Entitlement, Certificate of Eligibility (COE), and Loan Guaranty Certificate (LGC), specific requirements regarding radon gas are not uniform across the country. They are heavily influenced by:

• State and Local Regulations: Many states have laws concerning radon, often focusing on disclosure requirements for residential property sales, certification for service providers, and standards for measurement and mitigation.
• Lender Overlays: Individual lenders may impose additional requirements beyond federal or state minimums, often mandating radon testing even when not required by law.

Builders of new construction for VA loans may be required to certify whether a property was built using Radon-Resistant Construction techniques and if it complies with local building codes or state regulations for radon control.

State-Specific Examples

Examples of state regulations include:

• Colorado, Illinois, Iowa, Minnesota, Pennsylvania: Require radon disclosure in residential sales.
• Iowa: Strongly recommends radon testing by state law, and some lenders mandate it.
• Florida: Establishes certification requirements for radon service providers and sets limits for radon decay product concentration (e.g., annual average not to exceed 0.02 WL or 4.0 pCi/L).
• New Jersey: Requires the Department of Environmental Protection to certify that radon contamination is within acceptable limits after inspection or mitigation.

Radon Mitigation

When elevated radon levels are detected, Radon Mitigation systems are installed to reduce the concentration. These systems typically involve venting the gas from beneath the house to the outside. States may reference specific industry standards for mitigation and construction, such as ANSI/AARST Multi-family Measurement and Mitigation Standards, ASTM E2121-12, and CCAH-2013.

Impact on Appraisals and Disclosures

Significant environmental issues like high radon levels can impact property value and condition, which may be considered during The Appraisal Foundation. Undisclosed severe radon issues could potentially relate to Mortgage Loan Fraud and Misrepresentation if there is misrepresentation. While this document focuses on VA loans, radon requirements for Federal Housing Administration (FHA) loans may have similar considerations.

References

1. 2026 VA Radon Testing: Required? Mitigation Costs Explained — valoannetwork.com
2. [PDF] State Multi-Family Radon Requirements State Certification — sosradon.org
3. [PDF] Radon Gas Certification for VA Builder Property - Windsor Mortgage — windsormortgage.com
4. [PDF] 2022 IAQ Database - Radon - Environmental Law Institute — eli.org