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What A 22-Year Iowa Inspector Confessed Over Coffee Last Month About The County-Level Radon Map No Realtor Will Ever Show You
"I have walked away from listings where the seller refused to test. I am the only inspector in the county who does that."
— Tom B., 22-year environmental inspector, Iowa
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The Phone Call That Started Everything
The booth at the diner was in the back corner where Tom sat down at 9:14 AM on a Tuesday.
He had ordered black coffee and refused breakfast. He told me he had to be on a job site by 10:30 in a county forty-five minutes away.
He had been doing residential environmental inspections in Iowa for twenty-two years.
He had agreed to talk to me on background because he had decided, at age 58, that he was tired of watching the same families walk into the same problems with the same lack of warning.
He told me three things in the next forty minutes.
The first was that the EPA Radon Zone Map has been online since 1993 and the vast majority of his clients in his entire career had never seen it.
The second was that the Iowa state radon average is 8.8 pCi/L — more than double the EPA action level — and that approximately 70% of homes in Iowa test above 4 if anybody actually tests them with a real continuous monitor.
The third was that he had walked away from inspections in the past five years where the seller refused to allow a radon test and the buyer was happy to skip it because the realtor had told them it would slow down the deal.
He told me he was the only inspector in his county who would walk away from a paying client over radon.
He told me he had stopped going to the county Realtor Association events because of the things they said about radon at the bar afterward.
He told me he was going to retire in three years and he had decided to spend the remaining three years saying out loud the things he had been thinking quietly for two decades.
I asked him what he wanted me to write.
He said: "Write that the map exists. Write that the average is 8.8. Write that 70% of these houses are above the action level. Write that nobody is required to tell anybody. Write it so somebody buys a monitor before another family gets the diagnosis we all know is coming."
I'm writing that.
If you live in Iowa, Pennsylvania, Ohio, Colorado, Minnesota, Illinois, Indiana, Nebraska, Kentucky, Tennessee, the Dakotas, or any state on the EPA red zone — please read every word.
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.
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
Tom pulled out a napkin and wrote two sentences.
The first 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."
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."
"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 after coffee with Tom.
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.
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.
While your kids sleep. While you sleep. 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. 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.
Tom's clients couldn't.
You still can.
(I linked the monitor I use below)
SEE WHAT TOM HAS BEEN HIDING →
"Iowa, dark red county on the EPA map. My inspector mentioned radon as 'optional' during my pre-purchase inspection. I bought Clarity the day after closing. Long-term average over four months: 16.4 pCi/L. Got mitigation installed before any furniture went in. Get the monitor before the realtor closes the deal." — Tarah J., Iowa
"Pennsylvania red zone. Lived here 31 years. Husband died of lung cancer at 68 — never smoked. Tested the house with a Clarity after the funeral. Long-term average over three months in the master bedroom: 19 pCi/L. The system has been killing him for thirty years and nobody ever told us. Get the monitor." — Mavis E., Pennsylvania
"Iowa state radon average is 8.8 — I read it in this kind of article. Bought a Clarity that night. Long-term average over four months in our farmhouse basement: 23 pCi/L. Mitigation installed within a month. New average: 0.9. Get the monitor for the rural homes that nobody ever inspects." — Tucker H., Iowa
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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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