Most homeowners think about the air quality they can see — dust on the ceiling fan, pet hair on the couch, the occasional musty smell in the basement. But the most dangerous air quality issue in any Fishers home is the one you can’t see, smell, or taste: radon. And if you live in Hamilton County, the odds are very much not in your favor.
The U.S. Environmental Protection Agency classifies Hamilton County as a Zone 1 radon area, the highest-risk designation on the map.
That means roughly 1 in 3 homes in our region tests above the EPA’s action level of 4 picocuries per liter (pCi/L).
According to the American Lung Association, radon is the second-leading cause of lung cancer in the United States after smoking, and the leading cause among non-smokers.
For a threat that’s this common and this serious, it’s remarkable how few homeowners have ever had their house tested.
This article walks through what radon is, why Fishers homes are so susceptible to it, how testing and mitigation actually work, and what to look for when you’re ready to hire a professional.
The goal is to give you enough information to make a smart decision about your home — because when it comes to radon, not knowing is the most expensive option.
What Radon Is and Why It Matters
Radon is a naturally occurring radioactive gas produced by the breakdown of uranium in soil, rock, and groundwater. It seeps up through the ground and enters homes through cracks in foundations, gaps around service pipes, sump pits, crawl spaces, and even well water. Because it’s colorless and odorless, the only way to know if your home has a radon problem is to test for it.
Long-term exposure to elevated radon is what causes the health risk.
The EPA estimates that radon is responsible for about 21,000 lung cancer deaths each year in the United States.
Unlike many environmental health risks, the fix is well-established, affordable compared to the alternative, and almost always effective.
Why Fishers and Hamilton County Homes Are Especially Vulnerable
Central Indiana sits on a geology of glacial till and limestone bedrock that naturally produces higher levels of uranium decay.
The Indiana State Department of Health’s radon program publishes county-by-county data showing that Hamilton County consistently lands in the upper tier of average indoor readings statewide.
Combine that with the construction style common across Fishers — finished basements, slab-on-grade construction, and tightly sealed energy-efficient homes — and you have ideal conditions for radon to accumulate indoors.
Newer construction isn’t safer. In fact, the better a home is sealed for energy efficiency, the less ventilation it has to dilute radon that enters from below.
Homes in neighborhoods across Fishers, Geist, and the broader Hamilton County area routinely test at levels well above the EPA action threshold, including homes built within the last five years.
Location within the county doesn’t reliably predict risk either.
Two houses on the same street can test at wildly different levels based on foundation cracks, soil composition directly under the slab, and how the HVAC system moves air through the home.
That’s why testing your specific home — not relying on a neighbor’s result — is the only meaningful way to know where you stand.
How Radon Testing Actually Works
There are two main categories of radon testing:
- Short-term tests run for 2 to 7 days and give you a quick snapshot. These are typically used for real estate transactions, initial screening, or when you want a fast answer.
- Long-term tests run for 90 days or more and give you a more accurate picture of your home’s average radon level across seasonal variations.
A certified professional will typically use a continuous radon monitor (CRM), which takes hourly readings and produces a detailed report showing how levels fluctuated over the test period.
This is far more reliable than a passive charcoal kit from the hardware store, which can be affected by humidity, placement, and shipping delays.
Homeowner discussions on forums like Quora often note that short-term DIY results can vary wildly between tests in the same home — which is exactly why professional-grade equipment matters.
If you’re buying or selling a home in Fishers, a professional short-term test is almost always the right call.
The results are time-sensitive, legally relevant, and need to come from a credentialed source that a lender or buyer will accept.
What Happens if Your Levels Are High
If your home tests at or above 4 pCi/L, the EPA recommends mitigation. Levels between 2 and 4 pCi/L are considered a gray zone — still carrying health risk, and many homeowners choose to mitigate at these levels as well.
Radon mitigation is not a mysterious process.
The most common and effective method for Indiana homes is sub-slab depressurization, which involves installing a sealed PVC pipe through the foundation slab and running it up through the house to a small fan that vents radon-laden air safely above the roofline.
A well-designed system typically reduces indoor radon levels by 95 to 99 percent and runs continuously for the life of the home with minimal maintenance.
For homes with crawl spaces, a variation called sub-membrane depressurization is used, which places a sealed vapor barrier over the soil and draws air from beneath it.
Homes on well water with elevated waterborne radon may also need an aeration system for the water supply, though this is less common than soil-based contamination.
A quality installation takes most professionals a single day.
The system is quiet, energy-efficient (most fans draw about as much power as a lightbulb), and should come with a post-installation test to confirm the system is actually working.
What to Look for in a Radon Professional
Radon mitigation is a specialized trade, and the gap between a good installer and a mediocre one is significant.
When evaluating contractors, the most important credential to verify is NRPP (National Radon Proficiency Program) or NRSB (National Radon Safety Board) certification.
In Indiana, radon professionals are also required to be licensed by the state health department.
Beyond credentials, here’s what separates a professional from an amateur:
- A pre-installation diagnostic test, not just a one-size-fits-all system design
- Post-mitigation testing included, so you have proof the system actually reduced your levels
- A written warranty on both the system components and the radon reduction result
- Clean, code-compliant installation with the fan mounted outside or in an unconditioned space, never in a basement or crawl space
- Transparent pricing with no vague line items or pressure tactics
You should also expect the contractor to walk you through how the system works, where it vents, and what to do if the warning indicator on the manometer (the U-shaped tube on the pipe) ever shows the fan has stopped.
A locally based company serving Fishers and the surrounding Hamilton County communities brings an advantage that’s hard to overstate: they’ve seen hundreds of homes with similar construction, similar soil, and similar HVAC layouts, and they know what actually works here.
Healthy Interior Solutions – Mold, Radon, and Restoration is one of the local providers Fishers homeowners turn to for this kind of work — you can find more information about their radon testing and mitigation services ontheir website.
The Bottom Line for Fishers Homeowners
If your home has never been tested for radon, that’s the single highest-value home maintenance task you can check off this season.
A test is inexpensive, non-invasive, and gives you a definitive answer in a matter of days.
If your levels come back low, you have peace of mind. If they come back elevated, you have a clear path to fixing the problem before it affects your family’s long-term health.
In a region where the EPA has flagged every home as being in the highest-risk zone for radon, waiting to find out isn’t a neutral choice — it’s an active one. And it’s the one decision about your home where the stakes are measured in something more important than dollars.
