Gatineau Radon Map: Every Home Health Canada Tested, and What It Read

73 homes across Gatineau were long-term tested for radon in the two federal surveys. Every one is a dot on this map, coloured by what it read, with the number of tested homes printed beside every district figure.

The Map

Every dot is one tested house. Zoom in for street names. Shaded districts had no home tested in either survey. This page covers postal districts J8 and J9. The whole province is on the Quebec map.

under 100100 to 147148 to 199200 and aboveno homes tested

73 measurements shown. Dot positions inside a district are illustrative, not addresses. The survey records which district a home was in, never where it stood. Tap any dot for its reading, or any district for its count and median. Rural districts here cover thousands of square kilometres, so a dot in one says very little about any particular corner of it.

Built from Health Canada's published measurements under the Open Government Licence. We do not sell radon testing or mitigation.

What the Numbers Say

15%

of tested Gatineau homes at or above Canada's 200 Bq/m³ action level

median reading, Bq/m³

917

highest single reading, in J9E

On 73 tested homes this is too small a sample to rank. For scale, of the 33 places mapped with a hundred or more, Halifax is highest at 35.2% of tested homes at or above the action level and Toronto and the GTA lowest at 2.2%. The spread between houses on one street is bigger than the spread between any two of them.

The Number Changes Depending on Whose Limit You Use

Canada acts at 200 Bq/m³. The United States EPA acts at about 148. The World Health Organization sets a reference level of 100. Applied to the same 73 homes:

15%

at or above Canada's 200

22%

at or above the US EPA's 148

33%

at or above the WHO's 100

Same houses, same measurements. Why the three numbers differ, and which one to use.

By Postal District, with the Sample Sizes Shown

Read the count column before the median column. A district resting on four houses is a hint, not a verdict, and those rows are greyed. The land area column matters too: a district covering ten thousand square kilometres is an average across a region, not a neighbourhood.

District	Land km²	Homes tested	Median	Highest	At or over 200
J9E	570	2	769	917	2
J8Z	9	3	268	536	2
J8N	612	2	182	313	1
J8Y	8	2	166	297	1
J8V	140	6	144	407	2
J8H	194	2	139	219	1
J8M	54	4	99	177	0
J8T	18	6	94	163	0
J9B	113	3	90	711	1
J9H	16	4	90	194	0
J9Z	148	3	90	96	0
J8G	478	3	88	365	1
J9L	587	2	74	121	0
J9J	72	4	68	122	0
J9P	3,764	3	67	97	0
J8C	158	2	54	73	0
J8L	593	4	48	105	0
J8P	27	3	48	59	0
J9T	430	4	33	69	0
J9X	97	7	31	89	0
J8R	87	2	29	36	0
J9A	15	1	29	29	0
J9Y	1,324	1	16	16	0

0 districts have ten or more tested homes, which is where these figures start to mean something. The districts with no measurement at all are J8A, J8B, J8E, J8X, J9V.

What Actually Settles It

Nothing on this page describes your house. Radon varies enormously between homes on the same street, because it depends on how each building sits on and draws air from the ground beneath it. The highest reading here is 917 Bq/m³ and it sits in a district whose median is far below it. A long-term test in your own home is the only measurement that tells you anything about your home.

Also: every C-NRPP certified radon company here, the other city and province maps, and what radon actually is.

Sources and method. Radon measurements: Health Canada, Radon and Thoron Data From Canadian Homes pooled with the Cross-Canada Survey of Radon Concentrations in Homes 2009-2011, both under the Open Government Licence – Canada. Boundaries: Statistics Canada 2021 cartographic forward sortation area file, same licence. Percentages are calculated from the individual measurements shown, not quoted from a summary. Land areas are from the Statistics Canada boundary file.