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How A 22-Year Iowa Inspector Showed Me The EPA Map The Real Estate Industry Has Been Hiding For Thirty Years — And Why I'm Publishing It Despite Their Warnings
"The map's been online for thirty years. Almost nobody in the highest-risk zones has ever looked. That's not an accident."
— Tom B., 22-year environmental inspector, Iowa
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The Phone Call That Started Everything
Why I'm Writing This
I was warned by three people in real estate not to publish this article.
One of them is a friend.
She told me it would "tank home values in red zones."
I asked her how many of her clients in red counties she had ever shown the EPA Radon Zone Map to in twenty years of selling houses.
She didn't answer.
That answered the question.
I'm publishing this anyway.
What you are about to see is a piece of public information that has been online since 1993 and that no realtor, no inspector, no insurance company, no bank, and no doctor has ever sent to you, mentioned to you, or even hinted exists.
It is a map.
It color-codes every county in the United States by predicted indoor radon level.
If your county is colored red, the EPA officially predicts your area's average indoor radon is above the action level — meaning the math says somewhere between 30% and 70% of homes in your county should be tested and likely mitigated.
The map is at https://www.epa.gov/radon/find-information-about-local-radon-zones-and-state-contact-information
Pull it up while you read this.
I'll tell you what every red-zone homeowner needs to know.
The Numbers Behind The Color
Iowa: 8.8 pCi/L state average. More than double the EPA action level.
Pennsylvania: 7.9. Nearly double.
Colorado: 6.3.
Ohio: 5.8.
Minnesota: 5.2.
National average: 1.3 pCi/L.
Homes in these states are breathing air with two to three times the radon of the national average.
Some individual homes in these states read 10, 15, 20, or higher.
The state averages mask the extremes.
The extremes are where the cancer happens.
Sentence One On Tom's Napkin
Last month I had coffee with Tom — twenty-two years inspecting houses in Iowa.
I asked him: "If the data is so clear, why doesn't anyone in red zones know?"
He pulled out a napkin and wrote down two sentences.
The first one read: "The data is public. The map is public. The risk is documented. Nobody delivers it to anyone."
He explained.
The EPA Radon Zone Map has been online since 1993.
Every state health department has it.
Every county knows their classification.
Every realtor in a red zone knows it exists.
But nobody is required to show you.
Your doctor doesn't mention it.
Your realtor didn't bring it up at closing.
Your home inspector may or may not have suggested testing depending on the state.
Your builder labeled the home "radon-resistant" and moved on.
Your county doesn't send mailers.
Your school district doesn't notify parents.
Your insurance company doesn't ask.
The information is available.
It's just not delivered to anyone.
Sentence Two On Tom's Napkin
Tom underlined the second sentence twice.
It read: "In a red zone, your house has a statistical probability of being above the action level. The only way to know is to measure."
Then he told me the part that made me actually pull up the map myself.
The 1-in-15 statistic the EPA publishes is a national average.
In a red zone, the math is much worse.
In Iowa, where the state average is 8.8 pCi/L, somewhere around 70% of homes are above the EPA action level.
In Pennsylvania, it's roughly 40%.
In Ohio, around 30%.
In Minnesota, around 40%.
If you live in any of those states, your house has odds against it.
Not 1-in-15.
Closer to 1-in-3.
Or 1-in-2.
Your specific house might be the exception.
You don't know.
You can't know.
Because nobody ever measured.
The "Low Risk Area" Lie
The most common Reddit comment I see from skeptics is this:
"I didn't think radon was going to be an issue because we're in a low radon area."
"I live in FL and looking at the EPA site, it looks like FL has a much lower likelihood of Radon being an issue."
"Maybe it's not a thing in IN or Ky or Tn."
Here's the problem with the "low risk area" assumption.
EPA Zone Maps describe predicted average indoor radon for the county. They do not describe your specific house.
A house in a Zone 2 (yellow) county can absolutely have a long-term average above 4 pCi/L. The Reddit threads are full of homeowners in "safe" states who tested and discovered 8, 11, 14 pCi/L.
The map is a starting point. It tells you the probability your house has a problem.
If you are in Zone 1 (red), the probability is high enough that not testing is reckless.
If you are in Zone 2 (yellow), the probability is moderate enough that you should still test once.
If you are in Zone 3 (green), the probability is low — but not zero. The EPA still recommends testing.
The "low risk area" reassurance from your realtor or your neighbor is not based on your specific house. It is based on a county-level average that does not predict any individual home
The only way to know your house is to measure your house.
The Kitchen Table
I went home that night.
11 PM.
I looked up my county on the EPA Radon Zone Map.
Red.
I'd lived in this house for six years.
I'd never tested.
The previous owners hadn't either.
My realtor had never mentioned it.
My inspector had checked a box that said "radon testing — additional fee" and I had skipped it because I was already over budget on the inspection.
Six years.
In a red county.
In a house above a slab.
With a daughter sleeping in the bedroom directly above the basement since she was four.
I sat at that table for two hours.
The next morning I ordered Clarity Steadfast — a continuous radon monitor.
Not a charcoal kit. A charcoal kit gives you a 48-hour snapshot from one weekend during one season. Same lie, just shorter.
A continuous monitor plugs into the wall, updates the pCi/L reading every hour, tracks the long-term average automatically.
It arrived Tuesday afternoon. I plugged it in at 4 PM in the basement.
By 9 PM the basement read 7.8.
By morning it was 9.1.
In my daughter's bedroom — directly above — 6.4.
After three months the basement long-term average came in at 8.6. Her bedroom: 5.9.
Six years.
I am not telling you the worst-case story.
There are families with readings of 18, 30, 60.
There are families who lost a parent before they ever heard the word "radon."
I am telling you a normal red-zone story. A normal red-zone house. A buyer who never measured because nobody ever showed him the map.
What's Actually Happening In Your Lungs
Radon is a radioactive gas.
It seeps from the soil under your foundation.
You can't see it. You can't smell it. You can't feel it.
It enters through cracks in the slab. Through gaps around pipes. Through the sump pit.
Once inside, it gets inhaled.
The radioactive particles deposit in the lining of your lungs.
They sit there. They decay. They release alpha radiation directly into your tissue.
At 4.0 pCi/L — the EPA action level — six hundred thousand radioactive disintegrations are happening in your lungs every hour.
Six hundred thousand.
Per hour.
Most homes that have a problem in red zones aren't at 4. They're at 8, 11, 14, sometimes 30.
There are no symptoms.
There's no warning.
By the time there's a symptom, it's almost always advanced-stage lung cancer.
Latency: 5 to 25 years.
The lung cancer cases being diagnosed in 2026 in red zones were caused by exposure that started in 2001 to 2021.
The cases being caused right now in red-zone houses show up in 2040.
In houses where families looked at no map, never tested, and trusted that someone would have said something if there was a problem.
The Offer
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Every order includes:
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Two Futures
If you live in a red zone and you've never tested — you are not protected.
You don't have a piece of paper.
You don't have a number.
You have a county classification that says your area's predicted average is above the action level.
And you have hope that your specific house is the exception.
Radon doesn't care about hope.
It fluctuates with every season. Every storm. Every pressure change. Every winter when your house seals up tight.
While your kids sleep.
While you sleep.
CO has no smell. No color. No warning. No symptoms for years. Sometimes decades.
Future One: Don't pull up the map. Don't measure. Keep telling yourself your house is probably the exception. Keep believing someone would have warned you. Wait. Twelve years from now you find out the way most families find out — through a diagnosis, a news story, a Reddit thread at 2 AM.
Future Two: Pull up the map. See your county color. Plug a Clarity into your wall and find out what your specific house has been doing all along. By morning the screen shows the first real number that house has ever produced. After three months you have a long-term average that tells you the truth.
The map says otherwise about most red-zone homes.
You cannot undo the years that have already passed.
You can only control every year from this one forward.
The 21,000 families who died last year couldn't.
You still can.
(I linked the monitor I use below)
SEE WHAT YOUR COUNTY HIDES →
"Pulled up the EPA map after this kind of article. Iowa, dark red county. Bought a Clarity that night. Long-term average: 12.4 pCi/L. Mitigation system installed within three weeks. Get the monitor." — Greg N., Iowa
"Pennsylvania red zone. Lived in the same house 22 years. Never tested. Bought Clarity for my parents after my dad's lung cancer diagnosis. Long-term average in their basement office: 18 pCi/L. Get the monitor for the parents you cannot afford to lose." — Lori H., Pennsylvania
"Bought Clarity after my realtor refused to discuss radon during my pre-listing inspection. Colorado red zone. Long-term average over four months: 9.6. Realtor wanted me to skip the radon disclosure. I got mitigation done first. Sold the house with documented mitigation. Get the monitor." — Phillip A., Colorado
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Note: Steadfast Clarity is a residential continuous radon monitor. If you suspect elevated radon, contact a certified radon mitigation professional and consult your state's department of public health.
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