What is Radon? A Quick Guide for Home Buyers in New Hampshire & Maine
If you're buying a home in New Hampshire or Maine, you’ve probably heard the term radon tossed around during the inspection process. It’s something that comes up often in our area—and for good reason.
Let’s break down what radon is, why it matters, and how you can handle it if you find high levels in a home you love.
So, What is Radon?
Radon is a naturally occurring radioactive gas that forms when uranium in soil, rock, and water breaks down. It’s colorless, odorless, and tasteless—so you won’t know it's there unless you test for it.
The big concern? Long-term exposure to high levels of radon is the second leading cause of lung cancer in the U.S., right behind smoking. That’s why it’s a serious topic when buying a home.
Why is Radon a Big Deal Around Here?
Radon is common across the country, but parts of New Hampshire and Maine—especially areas with a lot of granite in the ground—tend to have higher levels. I see elevated radon readings come up frequently during home inspections, and it doesn’t mean the house is flawed—it just means it needs a fix.
How Do You Test for Radon?
Testing is simple and affordable. You can go with either:
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Short-Term Test: Usually takes 2–4 days. This is the most common test during a real estate transaction. It's often done with a charcoal canister or a continuous monitor set up by a home inspector.
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Long-Term Test: These take 90 days or longer and give a better average over time. These are great for after you move in if you want a fuller picture.
The results are measured in picocuries per liter of air (pCi/L). The EPA recommends fixing radon issues if levels are 4.0 pCi/L or higher.
What Happens if the Radon Levels Are Elevated?
Good news—radon is very fixable.
The most common solution is a radon mitigation system. This usually involves:
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A PVC pipe system installed in the basement or crawl space.
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A fan that draws the radon gas from beneath the foundation and vents it safely outside, usually above the roofline.
These systems are typically $1,000–$1,500 and can often be installed in a day. Once installed, they can reduce radon levels by up to 99%.
Should You Walk Away From a Home With Radon?
Not at all. Radon is extremely common, and mitigation systems are straightforward and effective. If you find a home you love, and the radon test comes back high, it’s totally reasonable to ask the seller to install a mitigation system—or to negotiate that into the deal.
Final Thoughts
If you’re house hunting in NH or ME, make sure radon testing is part of your inspection process. It’s one of those behind-the-scenes health and safety items that’s easy to overlook but very important in the long run.
Have questions about radon, home inspections, or anything else as you navigate the buying process? I’m always happy to help.
– Dave from North Conway Realty