Radon testing and mitigation in Cochrane

What does the published research say about radon in Cochrane?

It says that Cochrane stood out, and it says so with limits that matter. The 2017 southern Alberta study reported Cochrane at 261 Bq/m³ and Okotoks with High River at 194 Bq/m³ as the highest average radon readings, against 115 to 122 Bq/m³ across the four quadrants of Calgarysource. Canada's guideline for indoor air is 200 Bq/m³, measured as an annual averagesource, so the Cochrane average in that paper sits above it.

Three cautions belong beside the number every time it is quoted. It is an average, the tests behind it were done from 2013 to 2016, and the paper does not publish how many Cochrane homes were measuredsource. A small group of houses can pull an average up or down. The town has also built a great deal since those tests, and no newer Cochrane-only figure has been published that we could find.

Wider surveys give the regional backdrop. The Cross-Canada Survey of Radon Exposure puts about 1 in 6 houses in the Calgary area at or above 200 Bq/m³source, and the same survey gives about 1 in 6 residential buildings at or above that mark for Alberta as a wholesource. Neither figure is specific to Cochrane. Our summary of what the regional radon studies measured and how to read them covers that research in more depth.

Does that average mean my Cochrane home is above the guideline?

No. An average above the guideline does not put every house above it, and it does not put yours there. Health Canada notes that radon differs from one house to the next, even between similar houses side by side, and that testing is the only way to be suresource. Two homes on the same Cochrane crescent, poured by the same builder, can return very different numbers.

The reverse holds too. A friend's low result across the street is not yours, and a calm reading in a previous house says nothing about this one. Health Canada's advice is that every home be tested, whatever its location or building typesource. In Cochrane the regional paper simply makes that advice harder to put off.

When a long-term result is above 200 Bq/m³, Health Canada recommends reducing it within one year, sooner at higher levels, and as low as reasonably achievablesource. The recommendation to act applies above 200 Bq/m³. Below that line the choice belongs to the owner, and no level of radon is considered risk-free.

Why does a town this new still need radon tests?

Because recent construction has not been shown to lower radon, and in the regional data it went the other way. Cochrane is a fast-growing foothills town. It counted 32,199 residents in the 2021 federal census and 37,011 in the Town's own 2024 censussource. In the 2021 census, about 45% of Cochrane's dwellings were built from 2011 to 2021, and about 66% from 2001 onwardsource. A buyer here is far more likely to walk into a young house than an old one.

Young is not the same as low. In the 2017 study, homes built in 1992 or later averaged 31.5% more radon than older ones, 142 against 108 Bq/m³source. A 2019 study of 11,727 Prairie buildings tied higher radon to more recent construction, larger floor area, fewer storeys, higher ceilings and less window openingsource. A 2021 paper found Canadian houses from the 2010s and 2020s averaging 131 Bq/m³, compared with 28 Bq/m³ for Swedish houses of the same yearssource. Those are averages across many homes, not a forecast for one Cochrane address.

The Town sorts its neighbourhoods into two groups. Its established list includes Cochrane Heights, Glenbow, East End, Bow Ridge, West Valley, Riverview and West Terrace. Its growing list includes Sunset Ridge, Heartland, Fireside, Riversong, Greystone, The Willows, Heritage Hills, Rivercrest and Southbow Landing. We attach no radon level to any of these names, because nobody has published one. Homes in both groups get the same first step.

Which Cochrane homes have a radon rough-in?

Fewer than the age of the housing suggests, because the rule depends on a permit date and not on how new a house looks. Alberta's 2014 building code added soil gas protection for new buildings and became mandatory on November 1, 2015; homes whose building permits were applied for before November 1, 2015 generally were not required to have a radon rough-insource. The rule follows the permit application date, not the completion date, so a house finished after that day may still have been built under the earlier code.

Now set that beside the census. About 25% of Cochrane's dwellings in the 2021 census were built between 2011 and 2015source. That is a large band of modern-looking houses, many of them likely permitted before the rule took hold. Owners in that band often assume a pipe is waiting under the floor, and frequently there is none.

Under the current code, the National Building Code 2023 Alberta Edition, a new home must have the rough-in for a radon extraction system: a capped, labelled pipe through the floor that opens into granular material belowsource. On its own, that stub lowers nothing in a Cochrane basement. It moves no air until a fan is connected and the pipe is carried outdoors. Two checks settle the question in an afternoon: look for a capped pipe stub in the basement floor, and ask the builder or seller when the permit was applied for. If a stub is there and a test comes back high, the next step is described under activating a builder's radon rough-in.

Without a stub, nothing is lost except a shortcut. A suction point is cored through the slab instead, which is how most systems in existing houses are built. What that choice does to a quote is laid out in our breakdown of radon mitigation costs.

What changes on a sloped lot near the escarpments?

The method stays the same, but the route of the pipe and the wall chosen for the exhaust are decided by the ground. Town of Cochrane planning documents describe escarpments and steep slopes in several growing neighbourhoods, among them Riversong, Precedence, Rivercrest and Southbow Landingsource. Those documents describe the land. They do not describe the foundations built on it, and we make no assumption about any house until we have stood in its basement.

On a lot that falls away, the soil can meet the foundation at different heights from one side of the house to the other. That affects two decisions. The first is where the suction point goes, since the slab may not sit at a single level and one point may not reach all of it. The second is where the exhaust leaves, because a wall that is buried on the uphill side can be fully exposed on the downhill side, close to a deck, a door or a window. Each of those is checked with a pressure test and a walk around the outside before a hole is drilled.

Our standard layout keeps the fan on the pipe inside the basement, with the exhaust passing through the rim joist or, in some layouts, above the roof. Pipe is not strapped up the outside wall on our Cochrane jobs. Both exits are provided for in the Canadian mitigation standard, above the roof or through a side wall near ground level, and it says the side-wall option shall be favoured in cold weather areassource. Health Canada's reduction guide explains why: a fan and pipe outside the heated part of a house cool in the colder months, which can lead to condensation and possibly icesource. The general design steps are on our page about how a radon mitigation system is planned and installed.

How are semi-detached and row houses in Cochrane handled?

One unit at a time, with a test in each home and attention to what is shared. About 60% of Cochrane's dwellings in the 2021 census were single-detached houses, and close to 30% were semi-detached or row housessource. That attached share is too large to treat as an afterthought in this town.

A neighbour's reading through the party wall is not a substitute for your own. The slab under an attached home may or may not be joined to the one next door, and only a pressure check shows how far suction travels. The exhaust has fewer walls to choose from, and the available one often faces a shared walkway or the next unit's entrance. Where a condominium corporation looks after the exterior, ask the board early about any opening through a wall or roof. Our page on radon in townhomes and attached houses goes through those questions.

Does the Bow River or the valley explain Cochrane's radon?

Nobody has shown that it does. No published study links the Bow valley, Big Hill or the local geology to the radon measured in Cochrane, and the regional paper that reported the high average gives no cause for it. We will not guess at one. What can be said is practical: the level is set house by house, and a detector answers the question that a map cannot.

The river does matter for one common worry, which is tap water. Cochrane's municipal water is drawn from the Bow Riversource. According to Health Canada, radon leaves surface water and municipally treated water before that water enters the distribution systemsource. For a home on the Town supply, the subject is the air coming up from the soil, not the water coming out of the tap.

Properties beyond the town boundary on a private well are a separate case. A 2024 national study attributed most of the gap between rural and urban radon to proximity to drilled groundwater wells, and not to using their watersource. That finding is Canada-wide and is not a measurement of the country around Cochrane, so here too the answer is a test.

How do I test a home in Cochrane?

With a long-term detector on the lowest level people use, started once the furnace is running. Health Canada's measurement period is 3 to 12 months, and 91 days is the minimumsource. At least 91 of those days should fall in the heating season, when windows are closed and indoor radon tends to be highestsource. In a town where so many basements are finished as bedrooms, offices or suites, the lowest lived-in level is very often the basement itself.

You can run the test yourself with a laboratory kit, or have it placed for you. Professional tests in Cochrane are carried out by Plinio Neto, who holds the C-NRPP Radon Measurement Professional certification (CRT-202965). The steps, the paperwork and the wait are set out under long-term radon testing over a full heating season, and the choice between test types is explained in our guide to picking the right radon test.

Bought a house in one of the growing neighbourhoods and not sure where to begin? Begin with the test, not with the rough-in question. The result decides whether the pipe under the floor ever matters.

Who does the work, and how is the result confirmed?

The same certified person tests and installs, and the final confirmation comes from a laboratory he does not control. Installations in Cochrane are done by Plinio Neto, who holds the C-NRPP Radon Mitigation Professional certification (CRMT-202966). The certification is his personally, and you can look it up in the C-NRPP list of certified professionals. Certification under the Canadian National Radon Proficiency Program is what Health Canada tells homeowners to look for when hiringsource.

Health Canada describes sub-slab depressurization as the most common and effective methodsource, and that is what gets installed in the houses described on this page. Once the fan has been running, the installer takes a short verification reading to see the immediate change. The number that counts comes later, from a long-term kit supplied by an independent laboratory, which the homeowner places and mails. Nobody can honestly promise a final figure before that kit is read.

Health Canada recommends testing after a system goes in, again every 5 years while it is active, and after any renovation that affects the structure or ventilationsource. Developing a basement or adding a suite counts as that kind of change. Cochrane is one of the towns listed among the places where we test and mitigate, and the form on this page reaches the same person who would come to your door.