In Canada, two jurisdictions have moved to require radon testing in childcare facilities: the Interior Health region of British Columbia, which ordered childcare facilities to test in 2017 using the medical health officer's power to attach conditions to a licence, and Yukon, which announced in 2017 that testing and mitigation would become a phased-in licensing requirement for child care centres and family day homes. Everywhere else, testing schools and daycares is voluntary — but Health Canada's measurement guide covers them explicitly, the 200 Bq/m³ guideline applies, and staff are workers whose employer owes them a duty of care.
This guide covers what is actually required, what the protocol is, and why children's exposure is treated differently from adults'.
TL;DR: Required in BC's Interior Health region; announced as a phased-in licensing requirement in Yukon. Voluntary but recommended everywhere else. Band-operated schools and childcare are federally regulated and will be covered by the 200 Bq/m³ workplace limit from January 30, 2027. Alberta's childcare radon law was passed in 2017 but never came into force and has since lapsed — a widely repeated error worth correcting.
Where testing is required
| Jurisdiction | Status |
|---|---|
| Yukon | In 2017 the territory announced that radon testing and mitigation would become a licensing requirement for child care centres and family day homes, phased in — the first Canadian jurisdiction to move this way. Health Canada's policy survey lists Yukon among jurisdictions addressing radon in childcare. Operators should confirm current requirements with Yukon Health and Social Services, as the announcement did not carry a fixed implementation date. |
| BC — Interior Health region | Childcare facilities ordered to test in 2017, under the Community Care and Assisted Living Act power allowing a medical health officer to attach terms and conditions to a licence. Applies to the Interior Health region, not province-wide. |
| Band-operated schools and childcare | Federally regulated as workplaces under the Canada Labour Code. The 200 Bq/m³ annual-average limit applies from January 30, 2027. |
| Alberta | No requirement. The Radon Awareness and Testing Act (SA 2017, c R-2.5) would have required a radon test before a childcare licence was issued or renewed, but it was never proclaimed into force and lapsed in 2023. Pages describing it as current law are wrong. |
| All other provinces and territories | No radon-specific requirement for schools or childcare. General health, safety and licensing duties apply — in BC, for example, the Child Care Licensing Regulation requires a “healthy and safe environment” and that children not have access to hazardous substances. Staff are also workers, so provincial OHS general duty applies to the building. |
Why children are treated differently
Radon risk is cumulative: it depends on concentration multiplied by duration of exposure. Children in full-time care spend eight to ten hours a day in the same building, breathe a greater volume of air relative to their body weight than adults, and have more remaining years of life over which risk can express itself. That combination is why health and childcare organizations have pushed for childcare-specific policy, and why several jurisdictions internationally — Norway among them — apply a stricter action level to schools than to homes.
Health Canada's guideline does not set a separate number for children. The 200 Bq/m³ annual average applies, with the general principle that levels should be reduced as low as practicable, and that mitigation should be considered even where results approach but do not exceed the guideline.
The protocol for schools and daycares
Health Canada's Guide for Radon Measurements in Public Buildings covers schools and day cares explicitly. It is not the residential protocol:
- Long-term measurement — minimum three months, during the heating season. Short-term tests are not acceptable for deciding whether remediation is needed.
- Every occupied room in ground contact gets a detector — classrooms, offices, activity rooms, staff rooms. A room is a space enclosed by walls reaching the ceiling; a room occupied more than four hours a day is testable.
- One detector per 200 m² in rooms larger than 200 m² — gymnasiums, multipurpose halls.
- If the lowest level has no occupied rooms, test every occupied room on the first occupied level above.
- Quality control — duplicate detectors at 10% of locations and roughly 5% blanks. (Spikes are a laboratory-side control, not detectors placed in the building.)
- Not tested — bathrooms, kitchens, storage areas, indoor parking levels.
- Placement — 0.5–2 m from the floor, at least 30 cm from an exterior wall, away from HVAC currents and heat, positioned so detectors won't be disturbed. In a school, that usually means high shelves or ceiling suspension.
A typical elementary school with 20 ground-contact occupied rooms needs roughly 22 detectors once quality control is included. Detector-count logic by building type is in our guide to commercial radon testing.
The ventilation question — and why it matters most in schools
School and daycare ventilation typically runs on a schedule, reducing or shutting off outside operating hours. That means a long-term detector, which measures 24 hours a day for three months, may report a higher average than what children and staff actually breathe during the day — and conversely, cleaning and maintenance staff working after hours may be exposed to more.
Health Canada's guide provides a specific method for this. If the long-term result exceeds the guideline, a seven-day continuous-monitor test during the heating season (avoiding holiday periods) establishes the ratio between occupied-hours concentration and the overall average, which is then applied to the long-term result. The guide is explicit that this estimate is approximate, should only be used where the difference between occupied and unoccupied hours is significant, and must not be used if the monitor shows levels above the guideline during occupied hours. When in doubt, decisions rest on the long-term measurement.
If a result exceeds 200 Bq/m³
Health Canada recommends remediation within two years for results between 200 and 600 Bq/m³, and within one year above 600 Bq/m³, carried out by certified mitigation professionals, followed by a short-term test confirming the reduction and a long-term test during the next heating season confirming it holds. For mitigated buildings, retesting every five years thereafter. That interval comes from Health Canada's residential guidance; the public-buildings guide sets no post-mitigation retest interval, so it is applied to workplaces by extension rather than by rule. For buildings that tested below the guideline, Health Canada sets no fixed interval — the trigger is change: renovation, modified or rebalanced HVAC, altered airflow, a change in occupancy or in how rooms on the lowest occupied level are used, or anything affecting how the building meets the soil. In a school that means a classroom conversion, a portable added or removed, or a ventilation upgrade all raise the retest question.
Common questions
Do schools have to test for radon in Canada?
Public schools are provincially regulated and no province currently requires it. Band-operated schools are federally regulated workplaces and will be subject to the 200 Bq/m³ limit from January 30, 2027. Some school boards have adopted testing policies voluntarily.
Do daycares have to test for radon?
In BC's Interior Health region, yes. In Yukon, a licensing requirement was announced in 2017 to be phased in — confirm current status with Yukon Health and Social Services. Elsewhere in Canada, no radon-specific requirement is in force — though licensing rules requiring a “healthy and safe environment”, and OHS duties owed to staff, both apply to the building.
Who pays for testing and mitigation?
Responsibility for remediation and its cost rests with the building owner. For leased childcare space, that raises a landlord question best settled before testing rather than after.
Should parents ask whether a centre has been tested?
It's a reasonable question, and in most of Canada the honest answer will be that the centre has never tested. That isn't non-compliance — it reflects the absence of a requirement. A centre that has tested and can show a result is doing more than the law asks.
RadonTest.ca provides testing logistics and laboratory submission. We do not perform radon mitigation and we do not interpret health risk — Health Canada is the health authority on radon in Canada. This page describes publicly available regulatory information and is not legal advice.
Related institutional settings: hospitals, care facilities and correctional centres.
Read next
Hospitals, care and correctional · How commercial testing works · Rules by province · What a compliant record contains
Sources
Health Canada, Radon action guide for provinces and territories: Policies for specific locations; Health Canada, Guide for Radon Measurements in Public Buildings; Community Care and Assisted Living Act, S.B.C. 2002, c. 75; Child Care Licensing Regulation, B.C. Reg. 332/2007; Radon Awareness and Testing Act, SA 2017, c R-2.5 (never proclaimed, lapsed 2023); Canada Gazette, Part II, Vol. 160, No. 3 (SOR/2026-10); Health Canada, Canadian radon guideline.