What is Radon? And Why It Matters When Buying A Home

When you’re buying a home, it’s easy to focus on what you can see—layout, finishes, neighborhood, and curb appeal. But one of the most important factors affecting a home’s safety is something you can’t see, smell, or taste: radon gas.

Understanding radon and testing for it before you buy can help protect your health and give you peace of mind in your new home.

What Is Radon?

Radon is a naturally occurring radioactive gas that comes from the breakdown of uranium in soil and rock. It rises from the ground and can enter homes through small cracks in the foundation, gaps around pipes, crawl spaces, sump pumps, and even through well water.

Because radon is invisible and odorless, the only way to know if a home has elevated radon levels is to test for it.

Why Is Radon a Health Concern?

According to the U.S. Environmental Protection Agency (EPA), radon is the second leading cause of lung cancer and the leading cause among non-smokers. Long-term exposure to high radon levels increases cancer risk over time.

The EPA recommends taking action if a home’s radon level is 4.0 picocuries per liter (pCi/L) or higher.

Can Any Home Have Radon?

Yes. Any home can have radon, regardless of:

• Age or style
• Whether it has a basement, crawl space, or slab foundation
• How well it is maintained
• Whether nearby homes have tested low

Even newly built or energy-efficient homes can have elevated radon levels. Two houses next door to each other can have very different readings.

Why Test for Radon When Buying a Home?

Radon testing is one of the simplest and most affordable steps you can take during the home-buying process.

Testing allows you to:

• Understand potential health risks before you move in
• Make informed decisions during inspections
• Avoid surprises after closing
• Negotiate mitigation or credits if needed

Most radon tests take 2–4 days and are non-invasive.

What Happens If Radon Levels Are High?

A high radon result does not mean you should walk away from a home.

Radon is highly fixable. A radon mitigation system:

• Vents radon safely out of the home
• Typically reduces levels by up to 99%
• Often costs between $800 and $2,500
• Is usually installed in one day

Many homeowners live safely and comfortably in homes with mitigation systems already in place.

Should You Be Worried?

Concern is understandable, but radon should be viewed as a manageable issue, not a deal-breaker. Knowing a home’s radon level gives you control and clarity.

In fact, discovering radon before you buy is a positive—it means you can address it properly rather than unknowingly living with elevated levels.

How to Protect Yourself as a Buyer

If you’re purchasing a home, consider these steps:

• Request a radon test during the inspection period
• Review the results with your inspector or real estate professional
• Ask about prior radon tests or mitigation systemsIf levels are high, discuss mitigation options or negotiation strategies

Your real estate agent can help guide you through this process and connect you with qualified professionals if needed.

The Bottom Line

Radon is a common, invisible gas that can pose serious health risks—but it’s also one of the easiest environmental issues to identify and fix in a home.

By testing for radon before you buy, you’re taking an important step toward protecting your health, your investment, and your peace of mind.