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A Family Of Four Died At 6:02 AM Last Tuesday. Their CO Alarm Worked Perfectly. Here's The Detector They Were Missing.
I've investigated 430 gas explosions in 24 years. Every family had half the protection. Almost none of them knew the other half existed.
Fri, June 7
by Sarah M.
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The Phone Call That Started Everything
The Call I Wasn't Prepared For
I was eating cold pizza out of the fridge when dispatch called.
6:47 AM on a Tuesday in June.
I'd been up since 4 working a warehouse fire report that was two weeks
overdue. Dispatcher didn't say much.
"Single family. Arliss Drive. Structural collapse. Natural gas. Two confirmed, three transported."
I didn't finish the pizza.
I was there in 32 minutes.
The house was gone.
Not damaged.
Not burned.
Gone.
The south wall of the house next door was scorched and bowed outward.
A station wagon in the driveway across the street had its windshield blown in from pressure alone.
The neighbor who called 911 was standing on her front lawn at 7:15 AM in a bathrobe holding a coffee cup she'd filled an hour earlier.
She couldn't put it down.
She kept saying the same thing.
"The floor shook. The floor just shook."
I've been doing this 24 years.
Here's what I've learned that nobody understands about natural gas.
When it accumulates to between 5 and 15 percent of the air in a closed space,
it becomes an explosive mixture.
At that point, the smallest ignition source — a refrigerator compressor kicking on,
a light switch flipping, a thermostat clicking over,
static from a sock on carpet — releases enough energy to disassemble a single-family home in less than one second.
The father in that house had walked into his basement at 6:02 AM to check his water heater because the hot water seemed weak.
He flipped the light on his way back up.
He was dead before the echo reached the top of the stairs.
His wife and two children — ages 9 and 6 — died in their beds.
That is what was in the debris field when I got there.
What Was On The Wall, And What Wasn't
I dug with the ATF team for three hours that morning.
We found their CO detector in the rubble of what used to be the upstairs hallway. Kidde combination unit. Plugged into the wall.
I took it back to my lab the next day.
Hooked it up. Ran the sensor against calibrated gas. It worked.
Not damaged. Not degraded. Not faulty.
Perfectly functional.
It had been perfectly functional the entire time that family was dying.
The problem wasn't the detector.
The problem was that nobody had ever told that family they needed a second one.
Here's what almost no homeowner knows.
The CO detector on your wall is doing exactly one thing.
It watches for carbon monoxide. That's it. That's the whole job.
Natural gas is not carbon monoxide.
Natural gas is methane.
Completely different molecule.
Completely different sensor.
Completely different category of device.
If you bought a CO detector the day you moved in — which almost every responsible homeowner does — you did the right thing.
You just did half of it.
Nobody told you the other half existed.
That's not your fault. I've been an explosion investigator for 24 years and even I didn't have a combustible gas detector in my own house until last October.
I'll tell you why I do now.
What The NTSB Has Been Saying Since 2016
Let me walk you through something the gas industry doesn't want on your radar. August
10, 2016. Flower Branch Apartments. 8701 Arliss Street, Silver Spring, Maryland.
Four-story apartment building. Low-income families.
Mostly immigrants. Kids everywhere.
11:51 PM. Building collapses.
Seven dead. Two of them children. Sixty-five hospitalized.
The National Transportation Safety Board investigated for almost three years.
The cause was a single piece of equipment — a mercury service regulator in the basement meter room with an unconnected vent line.
Gas had been leaking into that room for at least three hours before ignition.
Residents had been smelling gas for weeks. Multiple complaints to management.
A plumber got sent in and couldn't find it. The complaints were logged, dismissed, forgotten.
The gas accumulated. The ignition source was inevitable. The timing was random.
When the NTSB closed that investigation, they issued a formal safety recommendation to all 50 U.S. states.
Every residential building with natural gas service should be required to have a methane detection system installed.
Not a CO detector. A methane detector.
Or a unit that detects both in one
device. That was 2016.
As of today, only Maine and New York City have acted on it.
That means approximately 74 million American households that use natural gas, and another 48 million that use propane, do not have the type of detector the federal safety board formally recommended after counting bodies in Maryland and East Harlem and Merrimack Valley.
2023 was the deadliest year for residential gas explosions in the United States in two decades.
2024 was worse.
There have been more than 400 documented residential gas explosions in the U.S. since 2020.
The NTSB recommendation is still sitting on the desk of 48 state governors.
What A Gas Leak Actually Looks Like
Most people picture this wrong.
When I tell them about a fatal leak, they picture hissing pipes, panicked families, a smell so strong it wakes everyone up.
That's Hollywood. That isn't most of what I investigate.
Let me tell you about three houses I've been in.
One. Spring of 2022. Portland. Family of five.
The mom woke up at 5:50 AM to make coffee. The dad was still in bed.
The two older kids were brushing their teeth.
The 13-year-old daughter had come downstairs first because she had soccer before school and needed her uniform out of the dryer.
She opened the basement door.
The leak had been running for six days from a loose flex line behind the gas dryer.
Whole basement was at about 8% LEL by that morning.
The mercaptan odor was stripped out by dust and laundry lint in the confined space — a thing that happens more often than you'd think.
She hit the dryer start button.
The dryer motor sparked.
Her mom was the only family member who survived, because she was the farthest from the basement at the moment of ignition.
The daughter is the one who would have lived if a gas detector had caught 3% LEL at any point during those six days.
Two. Winter of 2019.
Outside Denver. Elderly couple, 72 and 74.
Underground gas service line running from the street to their basement.
Hairline crack in the pipe about 40 feet from the house, three feet underground.
Gas had been leaking into the soil for eight to ten weeks.
The mercaptan — the rotten egg odor the utility adds specifically so you can smell leaks — was stripped out by the soil on the way to the house.
By the time the gas reached their basement through cracks in the foundation, it had no smell at all.
The husband turned on the TV one Saturday morning.
That's what triggered the ignition.
Neighbors across the street felt the concussion through their kitchen windows.
Three. Last August. Atlanta suburbs. Newlyweds, wife was four months
pregnant.
They'd been smelling something off for a week. Thought it was the garbage.
Checked under the sink, the fridge, the trash can. Couldn't place it.
The smell was a slow leak at the flare fitting where the gas line connected to their new range.
The connection had been done incorrectly during a kitchen remodel the previous owner had finished before selling.
The wife was in the garden Saturday afternoon.
The husband was in the kitchen making
lunch. He turned on the burner to heat a pan.
She found out she was a widow from a fire captain standing on her driveway while her house was still smoking.
These are the three patterns I see over and over.
Leaks that run for days, weeks, or months.
Smells that get missed because they're faint, buried, or stripped away entirely. Ignition
from something completely mundane — a light switch, a dryer, a TV, a burner.
And a CO detector on the wall that was never built to catch any of it.
Because it wasn't supposed to.
The Call From October I Don't Talk About
There's one case I wish I could forget.
October of last year. Suburb outside Pittsburgh.
Single family ranch house on a cul-de-sac. Mom, dad, two boys. Eleven and eight.
The dad had done basement renovation work two years earlier.
There'd been an old gas line running to a wood-to-gas furnace conversion from the 1980s that had been removed before they bought the house.
He had a contractor cap the line as part of the remodel.
The cap was undersized. Wrong thread type.
The contractor wasn't licensed for gas work. Nobody was watching.
Hairline gap between the cap and the pipe threads. Maybe one cubic foot of gas an hour escaping.
For two years.
In winter the basement was drafty enough that the gas dispersed before it could build up.
In summer with the AC running and the basement sealed tight, it started pooling.
By early October when the weather turned cold and the furnace fired up for the first time of the season, the basement was at about 6% LEL at floor level.
I've walked that basement.
The 11-year-old's name was written in Sharpie on the side of a plastic bin of LEGO that survived the fire because it was tucked in the corner of the laundry room.
Jacob.
His school backpack was still hanging on a hook by the basement door.
Blue. Had a patch on the front from some soccer camp he'd been to the previous summer. There was a half-eaten granola bar in the front pocket.
His mother had asked him to go down and check the breaker box because a light in the kitchen had flickered.
She was upstairs making Monday morning pancakes.
Frying pan on the stove. Batter on the counter.
Jacob opened the basement door at 7:14 AM and went down the stairs.
We found him at the bottom.
The forensic team reconstructed from the burn patterns that the explosion happened before he took his third step.
What I Asked My Colleagues That Night
I drove home from that scene at 9:47 PM.
My daughter was on the phone when I walked in.
She'd just found out she was pregnant with my first grandchild.
I sat on the edge of my bed that night and I could not stop thinking about one
question. I've been investigating these for 24 years.
The NTSB has been recommending residential gas detectors since 2016.
Every family I've pulled out of a debris field had a CO alarm somewhere in the house.
Why do they keep dying?
I called three people the next morning.
A senior pipeline safety investigator I've worked with on four cases.
A fire marshal in Massachusetts who worked Merrimack Valley.
A gas utility safety engineer who's been doing residential diagnostics for 31
years. I asked all three the same question.
If a family wants to actually be protected — not just CO-protected,
but protected from what takes houses down — what do they need on their wall?
All three gave me the same answer.
A residential combustible gas detector.
One that shows real-time concentration in percent LEL on a screen.
Not a threshold alarm that doesn't speak until 10 or 20 percent. A continuous readout from zero.
The safety engineer told me something I haven't been able to get out of my head.
"The reason families keep dying is that the category of detector we put on their walls doesn't catch the category of threat that actually kills them.
Everybody in the industry knows this. Almost nobody in the general public is ever told."
I spent the next week researching options.
The unit I ended up with is called the Haven Steadfast 4-in-1.
It plugs into a standard outlet at eye level. Shows combustible gas on a digital screen from 0 to 15% LEL in real time.
Shows CO on the same screen. Does both jobs in one device,
which meant I could replace the CO unit I already had with one that actually covers both halves.
I bought four.
One in the basement. One in the hallway by the guest room where my grandson will sleep when he stays over.
One in the kitchen.
One in the utility closet where the water heater lives.
First three weeks, all four read 0.0% LEL the whole time. Quiet as a
rock. Week four, the basement one jumped to 0.6% on a Thursday
afternoon.
Called the utility. Crew was there in 40 minutes.
Pinhole in a fitting feeding my dryer.
Installed professionally by a licensed plumber eight years earlier.
Eight years of slow leak. Never loud enough to smell.
Never enough to trigger any alarm I'd ever owned. Absolutely enough to kill my family if a spark had landed in the wrong place on the wrong night.
Cost to fix: thirty-nine dollars.
Cost of not knowing: everything.
Two Futures
If you bought a CO detector when you moved in and haven't thought about it since
you are not protected from what actually takes houses down.
You have half the coverage.
The half that catches carbon monoxide.
Not the half that catches the methane or propane flowing into your basement,
your utility closet, your laundry room, right now.
Gas doesn't care that you did half the work.
It accumulates anyway.
It pools anyway.
It waits anyway.
For the light switch.
For the refrigerator.
For the furnace.
For the dryer.
Future One: Keep assuming the CO detector covers it. Keep trusting that gas is something other families worry about. Keep telling yourself you'd smell it if something was wrong. Wait.
Future Two: Get the second half of the coverage. Put a combustible gas detector on the wall at eye level and see exactly what the air in your house is doing. Catch the leak at 0.6% LEL, not at 5%.
You cannot undo what happened in the houses I've investigated.
You can only control what happens in yours from tonight forward.
Jacob couldn't.
You still can.
Check what's on your wall.
Know what it's actually detecting.
Don't wait.
(I linked the one I installed in my own home below.)
Get The Haven Steadfast 4-Pack
"My husband and I had lived in our house for sixteen years. CO detector on the wall the whole time. We didn't know our furnace supply line had a slow leak. Our daughter bought us a Haven for Christmas as a joke because I'm paranoid about everything. First week it was reading 1.1%
LEL in our utility room. Utility came out and said another couple of weeks and we'd have been a news story. I cry thinking about it." — Linda R., Ohio
"I'm a plumber. 19 years in the trade. I didn't have a gas detector in my own house until I watched a colleague lose his brother and sister-in-law to a slow leak in Virginia. Bought four Havens that weekend. First week mine picked up 0.4% in the basement from a pinhole in a fitting I'd installed myself four years earlier. Please get one. Please." — Marcus T., Pennsylvania
"My three year old grandson was sleeping upstairs when my Haven started reading 1.3% LEL in the basement. Called the gas company. Cracked flare fitting behind the range. Technician said if nobody had been watching a screen and we'd kept using the stove for another few days we'd have lost the house. My daughter still has her son because of that number. Get the detector. Please." — Patricia M., Georgia
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Note: Haven Steadfast is a residential combustible gas and carbon monoxide detector. If you suspect a gas leak in your home, leave the building immediately, do not operate any electrical switches, and call your utility's emergency line and 911. This article reflects the personal experience of the author.
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