Radon Testing in Indiana: What Every Homeowner Needs to Know

If you own a home in Indiana, radon is a risk you can't afford to ignore. Indiana consistently ranks among the highest-risk states in the country for elevated indoor radon levels — and the only way to know if your home is safe is to test.

This guide covers everything Indiana homeowners need to know about radon: what it is, why it's dangerous, how testing works, and what to do if your levels are high.

What Is Radon?

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. It's colorless, odorless, and tasteless — completely undetectable without specialized equipment.

Radon seeps up through the ground and enters homes through:

• Cracks in foundation walls and floors
• Construction joints
• Gaps around service pipes
• Sump pits and floor drains
• Crawl spaces

Once inside, radon can accumulate to dangerous levels — especially in basements and lower floors where ventilation is limited.

Why Indiana Homeowners Face Elevated Risk

Indiana's geology puts it squarely in the EPA's Zone 1 — the highest radon potential category. The glacial soils that cover much of Central Indiana are particularly effective at allowing radon to migrate from the ground into homes.

Hamilton County, Marion County, Boone County, and surrounding areas all have documented histories of elevated radon levels. Studies have found that roughly 1 in 3 Indiana homes tests above the EPA's action level of 4 pCi/L.

That's not a small risk. It's a significant one that affects homes of all ages, types, and construction styles.

The Health Risk: Radon and Lung Cancer

Radon is the #1 cause of lung cancer in non-smokers in the United States, responsible for approximately 21,000 deaths every year according to the EPA.

When you breathe in radon gas, radioactive particles can get trapped in your lungs. Over time, these particles release small bursts of energy that can damage lung tissue and lead to cancer. The risk increases with both the concentration of radon and the length of exposure.

The good news: radon-related lung cancer is largely preventable. Testing your home and taking action if levels are high can dramatically reduce your risk.

What Is the EPA Action Level?

The EPA recommends taking action to reduce radon if your home tests at 4 pCi/L (picocuries per liter) or higher. At this level, the lifetime risk of lung cancer from radon exposure is comparable to the risk from smoking half a pack of cigarettes per day.

The EPA also recommends considering mitigation for levels between 2 and 4 pCi/L, since there is no completely safe level of radon exposure.

For context, the average indoor radon level in the U.S. is about 1.3 pCi/L. Outdoor air typically contains about 0.4 pCi/L.

How Radon Testing Works

Radon testing is straightforward and non-invasive. There are two main approaches:

Short-Term Testing (2–7 Days)

Short-term tests are the most common method for initial screening. A certified technician places a monitor in the lowest livable area of your home — typically the basement or first floor — for a period of 2 to 7 days.

At BAQS AIR, we use professional-grade continuous radon monitors that provide accurate, tamper-resistant results. These devices record radon levels hourly throughout the test period, giving us a detailed picture of your home's radon profile.

Long-Term Testing (90+ Days)

Long-term tests provide a more accurate picture of your home's average radon level over time, since radon levels can fluctuate with weather, seasons, and other factors. These are often used for follow-up testing after mitigation.

When Should You Test?

The short answer: now. There's no wrong time to test for radon, but certain situations make testing especially important:

• Before buying or selling a home — radon testing is increasingly standard in real estate transactions
• If you've never tested — especially if you've lived in your home for years
• After any major renovation — changes to your foundation or HVAC system can affect radon levels
• If you spend significant time in the basement — home offices, playrooms, and finished basements increase exposure

What Happens If My Levels Are High?

If your test results come back above 4 pCi/L, don't panic — but do take action. Radon mitigation is a well-established process that can reduce indoor radon levels by up to 99%.

The most common mitigation method is sub-slab depressurization: a pipe is installed through the foundation and connected to a fan that draws radon from beneath the slab and vents it safely outside before it can enter your home.

Mitigation systems are typically installed in a single day and are highly effective. After installation, a follow-up test confirms that levels have been reduced to a safe range.

Why Choose a Certified Radon Professional?

While DIY radon test kits are available at hardware stores, professional testing offers significant advantages:

• Accuracy: Professional monitors are more precise and provide continuous readings rather than a single average
• Tamper resistance: Professional tests meet EPA and state requirements for real estate transactions
• Expertise: A certified technician can identify potential entry points and advise on mitigation options
• Certification: NRPP/NRSB-certified professionals have demonstrated competency in radon measurement and mitigation

At BAQS AIR, all of our technicians are NRPP/NRSB certified and use state-of-the-art equipment to deliver results you can trust.

Protect Your Family — Schedule a Test Today

Radon is a serious but manageable risk. Testing is fast, affordable, and the only way to know if your home is safe. If you're in the Indianapolis metro area — including Carmel, Fishers, Westfield, Noblesville, Zionsville, or surrounding communities — BAQS AIR is ready to help.

Call us at (317) 523-0789 or use the contact form on our website to schedule your certified radon test. Same-day and next-day appointments are available.

Your family's health is worth it.