Learn about radon testing in Yukon schools

We are continuing radon testing in Yukon schools, as recommended by Health Canada. In 2026-27, we are:

• testing for radon in all schools that were not tested in 2025-26; and
• re-testing all schools where mitigation work was recently completed, to ensure the work was effective. 

Routine future testing 

All Yukon schools will be tested at least once every 5 years to ensure radon levels remain within Health Canada guidelines. 

In the winter of 2026, we tested for radon in:

• new school builds
• schools that have had recent work on the foundation; and
• schools where mitigation work was completed, to ensure the work was effective.

Already mitigated  

Schools that previously recorded radon levels slightly above Health Canada’s recommended level:

• Christ the King Elementary;
• Eliza Van Bibber school; 
• Holy Family Elementary; and
• Teen Parent Centre

Mitigation work was completed and re-testing for radon confirmed levels were reduced to acceptable ranges.  

New schools

New school facilities that were tested in 2025-26:

• Centre scolaire secondaire communautaire Paul-Émile Mercier (CSSC Mercier)
• Dámbü Tän Kets'ádań Kų̀ – Cliff Trail Elementary
• F.H. Collins Secondary School’s modular classrooms
• Hidden Valley Elementary School’s modular classroom
• Robert Service School’s modular classrooms

Schools being re-tested

Re-testing took place at:

• Jack Hulland Elementary
• Nelnah Bessie John School;
• Ross River School; and

All remaining schools

All remaining schools will be tested in the 2026–27 school year.  

Testing process and results 

Testing equipment was installed for at least 3 months in:

• every room, on the lowest level of each school, that was used for more than four hours a day; or
• in select rooms for re-testing, to ensure previous steps to reduce levels have been effective.

For each school in the table below:

• Highest refers to the highest radon level recorded in any tested room.
• Lowest refers to the lowest radon level recorded in any tested room.

Health Canada recommends mitigation when radon levels exceed 200 Bq/m3.   

*Note: Test results of any amount less than 15 Bq/m3 are reported as “< 15”.  

**Note: After these test results, contractors were dispatched to review and address the extraction systems installed to mitigate radon levels at Nelnah Bessie John school and Ross River School.  

In the spring of 2018, radon testing was conducted in Yukon schools. Testing equipment was installed:

• for at least three months; and
• in every single room, on the lowest level of each school, that was used for more than four hours a day.

For each school in the table below:

• Highest refers to the highest radon level recorded in any tested room.
• Lowest refers to the lowest radon level recorded in any tested room.

Health Canada recommends mitigation when radon levels exceed 200 Bq/m3.  

*Note: After this test result, a radon extraction system was installed at the Teen Parent Centre to mitigate radon levels.