Radon in Colorado Real Estate: What Buyers, Sellers, and Renters Need to Know

When you think about buying, selling, or renting a home in Colorado, radon might not be the first thing on your mind. But this naturally occurring, invisible gas is something everyone in the real estate world should understand. The good news? Testing for and fixing radon is usually simple and affordable!

What is Radon and Why Does It Matter?

Radon is a colorless, odorless gas that comes from the natural breakdown of uranium in soil, rock, and water. It can seep into homes through cracks in foundations, crawl spaces, and basements. Colorado’s geology makes it a hotspot for radon—about half of Colorado homes have radon levels above the EPA’s recommended action level.

Radon in Real Estate Transactions

Whether you’re buying or selling, radon is part of the conversation. Colorado law encourages disclosure: sellers must provide any known radon test results and a copy of the Colorado Department of Public Health & Environment’s "Radon in Real Estate & Rentals" pamphlet. Buyers can request a radon test during inspections, and if high levels are found, mitigation can be negotiated—just like any other home repair.

Rentals and Radon

Landlords are also encouraged to share information about radon with tenants. While not all rentals are required to be tested, it’s a smart move for peace of mind. Renters can ask about radon and request testing if it hasn’t been done.

Testing and Fixing Radon: Easier Than You Think

• Testing is simple and cheap: DIY radon test kits are widely available for $15–$40. Many local health departments even offer free or discounted kits. Professional Radon Testers must be licensed to do so in the state of Colorado. Some home inspectors are licensed to perform radon tests. Be sure to ask them before you pay for a radon test. A radon professional usually charges around $200 to test for radon. 
• Mitigation is affordable: If high levels are found, professional mitigation usually costs between $800 and $3,000—often less than many common home repairs.

Addressing radon not only protects your health but can also boost your property’s value and appeal. It’s a straightforward step that shows you care about your home and the people in it.

For more information, check out the official Colorado Department of Public Health & Environment resources or ask me for a copy of the pamphlet. Don’t let radon be a dealbreaker—let it be a simple box you check on your way to a safe, happy home!