This study counts certified radon professionals and their active credentials in each province and territory. We take the counts from dated pulls of the C-NRPP Find a Professional directory. The 2026 edition is the baseline: it sets where the counts start.
See the counts by credential type and province
Find a certified radon business near you
A new edition comes out each year
Each edition is a dated page under this one, and this page keeps the same address. Each edition holds:
- findings
- method
- sample
- limitations
- charts and data
- downloads and citation
The baseline counts one pull and compares nothing. We do not use earlier counts as a baseline unless we could check them against a public, independent source. From 2027, each edition compares a pull about a year later with the one before.
See how the Index builds and checks its data
Every certified professional is counted, free
We count every certified professional in the directory. Payment, claiming a listing or a badge never changes a count.
The data comes from C-NRPP’s directory, so it carries no licence statement until C-NRPP clears reuse.