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Radon Mitigation and Testing in Sherwood Park
Across Edmonton and the communities around it, Strathcona County included, about one home in six tested at or over Health Canada's radon guideline in the 2024 Cross-Canada Survey of Radon. Our crews test and fix radon all over Sherwood Park, in Ardrossan and on acreages throughout the County. Questions about a test or a result? Call us.
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Borrowed a radon detector from Strathcona County Library? Call us with the reading and we'll tell you what it means for your house.
On this page: Our Results · Radon Levels · Testing · Building Code · FAQ · Free Quote
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Our Radon Mitigation Work in Sherwood Park
Just a Few of Our Results From the Area
We fix radon in Sherwood Park's older crescents and its newest streets, in Ardrossan and on acreages around the County. Of the Sherwood Park-area homes we've fixed that had a lab test afterward, about 4 in 5 read under 30 Bq/m³ and not one read 100 or more (from our job records).
Each system is designed for the house it goes in. Canada's national standard for radon mitigation (CAN/CGSB-149.12-2024, section 1) says a system that is properly designed and installed by certified professionals can lower radon by about 90% or more. How well a system works comes down to who designs and installs it. We've lowered the radon in every home and commercial building we've ever worked on. Every system we install comes with guaranteed results.
Tricky homes are the ones our technicians enjoy most. Even after more than 3,000 homes, we still run into something new now and then, and when we do, the whole team works on it together, so every job has the experience of all our crews across Alberta and BC behind it.
The Five Homes Below
Before Mitigation
195 to 380Bq/m³
After
<15 to 28Bq/m³
380→19Bq/m³
Acreage east of Sherwood Park, Strathcona County
1980s · wood basement walls on a concrete slab · no sump pit
With no sump to draw from, we checked where the floor drain led before planning the system. The winter lab test after came back at 19 Bq/m³.
300→<15Bq/m³
Two-storey, Ardrossan
2020s · builder's radon rough-in · unfinished basement
Built with the capped pipe the code asks for, and it still read 300 Bq/m³ over four months on the owner's monitor. We sealed the sump and added a fan.
224→<20Bq/m³
Two-storey, Emerald Hills area, Sherwood Park
2010s · finished basement · sump under the stairs
A 90-day test read 224 Bq/m³. The sump was tucked under the stairs, and the winter lab test after came back below 20 Bq/m³.
284→28Bq/m³
One side of a duplex, north Sherwood Park
2010s · bungalow duplex · sump pit and HRV
The mechanical room sits on an outside wall, so the pipe run stayed short. The lab test after: 28 Bq/m³.
195→21Bq/m³
Three-level split, Clarkdale Meadows area, Sherwood Park
1990s · basement and a five-foot crawlspace · sump pit
The owners' own monitor read about 195 Bq/m³ in winter. The winter lab test after: 21 Bq/m³.
Readings in Bq/m³, before and after, from long-term tests, owners' digital monitors and lab tests. A “<” means the lab's reading fell below the lowest level its detector reads. We keep each home's details approximate, so no owner can be picked out. The Clarkdale Meadows home read just under 200 on its owners' monitor in winter and higher at times in summer, so they had it fixed. Photos are from other installs of ours around Sherwood Park.
Have a result over 200 Bq/m³, or not sure what yours means? Call us and we'll talk it through.
Radon Levels in Sherwood Park
What Tests Around Sherwood Park Have Found
Sherwood Park has no radon figure of its own. The nearest one counts Strathcona County in with Edmonton, and about one home in six there tested at or over Health Canada's guideline of 200 Bq/m³.
That's census division 11 in the 2024 Cross-Canada Survey of Radon, run by Evict Radon at the University of Calgary: close to 4,400 homes, averaging 108.3 Bq/m³, the highest at 1,493. Roughly 4 in 10 read under 100 and another 4 in 10 from 100 to 199.
We haven't found a public study that reports Sherwood Park, Ardrossan or the County's acreages on their own. And even a street-by-street figure couldn't tell you what's in your basement; only a long-term test in your home can. See how other parts of Alberta compare.
Homes Over the Guideline
Edmonton and Area, Cross-Canada Survey
1 in 6
Edmonton and Area Average, Cross-Canada Survey
108.3Bq/m³
Highest Edmonton-Area Home, Cross-Canada Survey
1,493Bq/m³
Strathcona County, Sherwood Park included, is counted in census division 11 with Edmonton, St. Albert, Leduc and the other communities around them. The survey tested 4,397 homes there: 17.3% read 200 Bq/m³ or more, 39.5% read 100 to 199 and 43.2% read under 100. Their average (geometric mean) was 108.3 Bq/m³, and the top reading 1,493 Bq/m³ (2024 Cross-Canada Survey of Radon, p.70). The survey gives no separate figure for the County.
What Your Radon Level Means
From Fresh Air to Canada's Guideline
Radon is measured in becquerels per cubic metre (Bq/m³). Here is where a long-term result sits next to the levels that matter in Canada, drawn to scale up to 300.
radoncare.ca
5 to 30
85
100
108.3
148 US
200
300
How Homes Here Tested
Homes tested in the census division that takes in Strathcona County, by range (Bq/m³)
Edmonton and area
43.2%
39.5%
17.3%
Under 100
100 to 199
200+
About 5 to 30Bq/m³
Fresh outdoor air. Radon from the ground gets diluted in open air, and the level changes from day to day and from region to region.
85Bq/m³
The average Canadian home.
100Bq/m³
The reference level the World Health Organization suggests for countries.
108.3Bq/m³
The average for census division 11, where the 2024 survey counts Strathcona County and Sherwood Park in with Edmonton and its neighbours.
148Bq/m³
The level where the US Environmental Protection Agency says to fix a home. A US number, shown for reference: Canada uses Health Canada's guideline.
200Bq/m³ (5.4 pCi/L)
Health Canada's guideline. Above it, Health Canada recommends lowering your level within a year, and sooner the higher it is.
300Bq/m³
The upper limit the World Health Organization and European rules set for a country's reference level.
200 is not the goal. Health Canada says no level of radon is risk free, and 200 is not a recommended stopping point if your home can reasonably go lower.
Above 300: How High Radon Can Go
Not drawn to scale
800Bq/m³
Canada's guideline from 1988 to 2007, before it was lowered to 200.
1,493Bq/m³
The top reading in that same census division, Strathcona County included, in the 2024 survey.
32,321Bq/m³
The highest Canadian home tested in the 2024 survey.
All levels are long-term averages, which is how Health Canada compares a home with its guideline. Sources: Health Canada (200) and its 2012 survey report (800 until 2007), the BC Centre for Disease Control (fresh air, which it puts at about 5 to 15; outdoor levels change from day to day and region to region, so we show a wider band), the World Health Organization (100 and 300), the US EPA (148, for reference), EU Directive 2013/59/Euratom (300), and the 2024 Cross-Canada Survey of Radon (85, 108.3, 1,493 and 32,321, and how homes here tested).
Radon Testing in Sherwood Park
The Best Way to Test
Start with a long-term test from us. Our long-term test kit sits in the lowest lived-in level of your home for at least three months, the kind of test Health Canada recommends, and a Sherwood Park winter is the right time to run it. When it's done, mail it to the lab in the prepaid envelope. It ships free, and if your number comes back high, call us and we'll go through it with you.
Long-Term Radon Test Kit
Lab analysis and a prepaid return envelope included. Free shipping in Alberta and BC.
$54.99
Order a Test KitPrefer to watch your levels on a screen? We also sell digital monitors, like the Airthings Corentium Home. It is one of the home radon monitors C-NRPP has tested.
Free Ways to Test in Sherwood Park
Borrow a detector from the library. Strathcona County Library lends a digital radon detector, the Corentium Home by Airthings, as its “Radon Screening Kit”: September to April, free with a library card, for up to three weeks, through a partnership with the Alberta Lung Association that started in October 2023. Search the catalogue for the Radon Screening Kit and place a hold. Check that one is free before you count on it: on October 22, 2026, all 22 of the library's kits were out and 88 people were waiting. The library calls these an initial reading and suggests a longer-term test if your levels are high.
Know a library or community centre that could use a radon detector? RadonCare may be able to donate one for your community to borrow. Contact us to ask.
Free detectors from your library are a good first look. Be careful with a free test from a company that also sells radon systems: a test of only a few days, or a detector in the wrong spot, can show a problem a proper test would not. More on what a short test can and cannot tell you.
Schools, Child Care and When to Test
Schools. Elk Island Public Schools, based in Sherwood Park, began testing its schools and central office for radon in 2017, with 91-day tests in the occupied classrooms and offices on the lowest floor and a follow-up wherever a result came in near or above 200 Bq/m³ (EIPS radon FAQ, January 2022). The same FAQ notes that school testing is not mandatory in Alberta.
Child care. Alberta has no radon testing rule for child care. The Radon Awareness and Testing Act, passed in 2017, would have required one, but it never came into force and was repealed at the end of 2023 (Alberta King's Printer). More on child care and schools.
Start in the fall. The library only lends its detectors from September to April, and a long-term test gives the result Health Canada asks for when it runs through the months your windows stay shut (Health Canada). Put one out by November and read it in the spring.
Why Sherwood Park Homes Have Radon
Radon is a gas given off as uranium in soil and rock breaks down, and there is some in the ground under every part of Canada. It finds its way in through basement floors and foundation walls and collects in a house that's shut tight (Health Canada).
Under Strathcona County, the ground is mostly glacial till and old glacial lake beds, with sand dunes in places, on top of shale and sandstone with seams of coal (a report for Strathcona County). No public study we know of links those layers to the radon in any one Sherwood Park house, and two homes on the same crescent can test very differently.
How a house is built matters too. In the 2024 survey, Alberta homes tested higher on average the more recently they were built, from 1971 through 2024, and the researchers found the same pattern from houses to row homes, in towns and in the country (p.51 and p.52). Much of Sherwood Park, and much of Ardrossan, is recent building.
Health Canada says radon is the number one cause of lung cancer in people who don't smoke. Radon has no symptoms, so a test is the only way to know. For questions about radon and your health, talk to your doctor or call Health Link at 811. More on radon and your health.
“In Canada, all regions have some radon-generating geologic source material.”
Alberta Homes by Year Built
Rise in the Average, 1971 to 2024
+39.2Bq/m³
Newest Homes, Average
131.6Bq/m³
2024 Cross-Canada Survey of Radon, p.51 and p.52
Sherwood Park Homes and What They Mean for Radon
Two Sherwood Parks, by Postal Code
Sherwood Park was built in two waves. In postal codes starting T8A, about half the homes went up before 1981. In postal codes starting T8H, about 7 in 10 were built in 2001 or later, and hardly any before 1981 (Statistics Canada, 2021 census). The older homes were built decades before Alberta added a radon rough-in to its code. The newer ones belong to the years the 2024 survey found testing higher. Newer doesn't mean lower: the 2010s homes above tested 224 and 284 Bq/m³.
Mostly Single Detached Houses
About 3 in 4 homes in Sherwood Park's postal areas are single detached houses, against about half in Edmonton (Statistics Canada, 2021 census; Edmonton). In a house, radon comes in through the basement floor and walls, so the test goes on the lowest level where someone spends at least four hours a day (Health Canada).
Acreages and Wells
About 1 in 4 people in Strathcona County live outside Sherwood Park (County census, 2024), and from our job records, more than 1 in 3 of the County homes we've fixed are acreages. Sherwood Park's tap water comes from EPCOR in Edmonton, but some County residents rely on truckfills and private wells (County water plan). If your acreage is on a well, a 2024 national study led by the University of Calgary found rural homes had higher radon on average than homes in cities, and linked much of the difference to drilled wells nearby. Test the house, whatever the one down the road got.
Ardrossan and the Newest Homes
Ardrossan has grown fast: more than 4 in 10 of its homes were built from 2016 to 2021 (Statistics Canada, 2021 census), most of them late enough to have the code's radon rough-in. Every one of the newest homes we've fixed around Sherwood Park had that capped pipe and still tested over 200 Bq/m³ before we put in a system, like the Ardrossan home above. A new sump isn't always sealed either: in one Ardrossan home it was covered with nothing but a plastic sheet. An open pit is an easy way in for radon, and Alberta's building code requires sump pit covers to be airtight. The lid also has to stay easy to take off, because the pump needs a check every year. Learn more about sealing a sump pit for radon.
Where the Radon Fan Is Installed
Canada's radon mitigation standard only lets a radon fan sit outdoors where winters are mild, and Sherwood Park's winters are well past that limit (CAN/CGSB-149.12-2024, section 5.8.1.1; National Building Code of Canada 2020, Appendix C, Table C-2). In the US, radon fans are often mounted outside, but that isn't allowed anywhere as cold as Sherwood Park, so here the fan is installed in a heated space, usually a basement, a utility room or a heated garage, and only the pipe goes out through the wall to the vent. We use fans designed for radon mitigation, so they're sealed properly and won't leak.
What We Find Under Sherwood Park Floors
Sand is what we find under most of the Sherwood Park-area floors we've opened, named on about 3 in 4 of our job reports, with gravel under the newest Ardrossan homes. About 4 in 5 of the homes we've fixed here had a sump pit, and most of our systems draw from the sealed sump. Where the fill is tight, we check the pressure under the floor before choosing the fan, and add a second suction point if the house needs it. Every system we've recorded here vents out through a side wall rather than the roof, like the one at the top of this page. Why it matters: how a radon system works.
Radon and the Building Code in Sherwood Park
What New Homes Need, and Since When
If the builder applied to build your Sherwood Park or Ardrossan home after November 1, 2015, it should have a radon rough-in: a capped pipe through the basement floor. That pipe has no fan, so on its own it isn't a radon system, and the house still needs a test.
Radon Rough-In Required
New Homes in Alberta, Since
2015
Fan Required by Code
No
Code Dates for Sherwood Park
- May 1, 2015: Alberta's first radon rough-in, a capped pipe through the basement floor. Builders could use either code until November 1, 2015; homes applied for after that date must have it (Government of Alberta).
- December 1, 2019: A new edition of the code, for homes the builder applied to build from this date. The rough-in stays, and the pipe must be labelled near the cap (Government of Alberta, STANDATA 19-BCB-003).
- May 1, 2024: The current code, for homes the builder applied to build from this date. Still no fan required (Government of Alberta).
How many homes here have the rough-in? About 1 in 9 homes in postal codes starting T8H, and more than 4 in 10 in Ardrossan, were built from 2016 to 2021, most of them late enough for it. In the T8A postal area it's about 1 in 100 (Statistics Canada, 2021 census; Ardrossan).
What It Means for Your Home
A rough-in is a head start, not a radon system: there is no fan, so a newer home still needs a test, and we test the pipe before using it. More on radon in the Alberta Building Code.
One County, One Set of Dates
Sherwood Park isn't a city of its own: it is the urban part of Strathcona County, and the County handles building for its neighbourhoods and the rural hamlets alike. So the same Alberta dates apply in Summerwood as in Ardrossan or Josephburg.
For homes the builder applied to build from December 2019, the pipe has to be labelled, so in a newer home, look for a labelled pipe in the basement before you test. It tells you what you have to work with if the result is high.
Radon in Alberta: The Bigger Picture
What your number means, how a system works, the price, grants and the rules for buying or selling a home are the same across Alberta, so they're on one page: What your level means · Radon and your health · How mitigation works · What changes the price · Grants and help paying · Alberta code history · Buying or selling · More radon questions
Sherwood Park Radon Questions
Is Radon a Problem in Sherwood Park?
Yes. In the 2024 Cross-Canada Survey of Radon, which counts Sherwood Park with Edmonton and the area around it, about 1 in 6 homes tested at or above Health Canada's guideline of 200 Bq/m³. The five homes shown above read 195 to 380 Bq/m³ prior to mitigation, which brought them down to 28 Bq/m³ or lower. A long-term test of your own home is how you find out where yours sits.
Which Sherwood Park Neighbourhoods Have the Most Radon?
No public study we know of reports radon by Sherwood Park neighbourhood, and levels can change a lot from one house to the next. The homes above are spread from Clarkdale Meadows and Emerald Hills to Ardrossan and the acreages east of town, older and newer, and every one needed a system. Test your own home.
My Newer Sherwood Park Home Has a Radon Pipe. Do I Still Need to Test?
Yes. In Alberta the rough-in is a capped pipe with no fan, so on its own it lowers nothing. The Ardrossan home above had one and still read 300 Bq/m³ on the owner's monitor. Test first, and if the number is high, we check the pipe has suction under the floor before we use it.
Where Can I Get a Radon Test in Sherwood Park?
Our long-term test kit ships free to Sherwood Park with the lab fee included; order it online. Strathcona County Library also lends radon detectors from September to April, free with a card, but expect a wait. See Radon Testing in Sherwood Park.
Does an Acreage Need a Different Radon System?
Not always, but older acreage and lake homes are where we find the unusual basements. Out at South Cooking Lake, more than half the homes were built before 1981 (Statistics Canada, 2021 census). We've sealed cinder-block walls where they meet the floor, worked around a wood foundation with no sump, and fixed an acreage with two sump pits. We check the pressure under the floor first, then design for what's there: the acreage east of Sherwood Park above went from 380 to 19 Bq/m³ with no sump to draw from. If your acreage is on a well, that's one more reason to test the house.
Can One Side of a Duplex Be Fixed on Its Own?
Often, yes. The north Sherwood Park duplex above went from 284 to 28 Bq/m³ with a system on its own side. Semi-detached homes are common in the newer neighbourhoods: more than 1 in 8 homes in postal codes starting T8H (Statistics Canada, 2021 census). Radon can be very different from one side of a duplex to the other, so a neighbour's result doesn't tell you yours. Both sides should test.
Do You Work in Ardrossan and the Rest of Strathcona County?
Yes. We work across Sherwood Park, from Glen Allan and Mills Haven to Summerwood and Cambrian Crossing, in the hamlets of Ardrossan, Josephburg, South Cooking Lake, Collingwood Cove, Antler Lake, Half Moon Lake and Hastings Lake, and on acreages throughout the County. Fort Saskatchewan too. Edmonton, St. Albert and Leduc each have their own page.
How Much Does Radon Mitigation Cost in Sherwood Park?
A radon system costs a fraction of the price of air conditioning. What moves the price here is mostly the basement. Most Sherwood Park homes have a sump pit, which we seal airtight and usually draw from; an acreage without one, or on a wood foundation, takes more planning. Tell us about your house on the phone and we can usually give you a price before you hang up. See what changes the price.
Why Doesn't RadonCare Offer Free Radon Tests?
Because we want your test done right, and we only recommend a system after a proper one: at least three months in the lowest lived-in level of your home. If you can get one of Strathcona County Library's detectors, it's a good free first look, though there is often a waiting list. Then follow it with a long-term test.
Is There a Grant for Radon Mitigation in Sherwood Park?
At the time of writing (October 2026), there is no Alberta, regional or city grant for radon mitigation. Anything we missed? Let us know. Two charities can help: the Canadian Lung Association's Lungs Matter program, if you have been diagnosed with lung cancer, or your household has a low to moderate income, and Alberta Lung, in radon season, if you have been affected by lung cancer. See grants and help paying.
Areas We Serve Around Sherwood Park
We work in every part of Sherwood Park, older neighbourhoods like Glen Allan and Mills Haven and newer ones like Summerwood and Cambrian Crossing, and across rural Strathcona County: Ardrossan, Josephburg, South Cooking Lake, Collingwood Cove, Antler Lake, Half Moon Lake, Hastings Lake and the acreages in between. Fort Saskatchewan too: call us.
Nearby Areas We Serve
Past the County Line? We Also Work Across Alberta and the BC Interior.
An acreage just past the edge of this map is still ours to test and fix. Our crews also work in Calgary and Red Deer and across the BC Interior. Not sure we come out your way? Call 1‑844‑723‑6622.
Get a Free Quote or Ask a Question
Fill out the form and a radon expert will get in touch to answer your questions. Prefer to talk? Call 1‑844‑723‑6622.
About RadonCare
We've lowered the radon in every building we've ever worked on: more than 3,000 homes across Alberta and British Columbia, plus schools, apartment buildings and government buildings. We started out in heating and ventilation, so our team of C-NRPP certified professionals designs every system from how air actually moves through your house, and we aim for the lowest level your home can reasonably reach, not just under the guideline. From your first test to a system built for your home, the results are guaranteed. RadonCare is a five-time Consumer Choice Award winner, and we're involved in Canada's radon industry, with seats on the CARST board of directors and the C-NRPP advisory board.
Updated October 2026