Vancouver and the Lower Mainland Radon Map: Every Home Health Canada Tested, and What It Read

147 homes across Vancouver and the Lower Mainland 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 V3 to V7. The whole province is on the British Columbia map.

under 100100 to 147148 to 199200 and aboveno homes tested

147 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

8%
of tested Vancouver and the Lower Mainland homes at or above Canada's 200 Bq/m³ action level
27
median reading, Bq/m³
1,174
highest single reading, in V4T

Vancouver and the Lower Mainland sits 23rd of the 33 places mapped with a hundred or more tested homes, at 8.2% at or above the action level, between Halifax at 35.2% and Toronto and the GTA at 2.2%. All on the same two surveys and the same method. The spread between places is real, and the spread between houses on one street is bigger still.

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 147 homes:

8%
at or above Canada's 200
12%
at or above the US EPA's 148
15%
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.
DistrictLand km²Homes testedMedianHighestAt or over 200
V4V12423294562
V4T671916611747
V7L7194940
V7V7258770
V5J14253670
V3G19727494651
V4X1318473971
V3J14235440
V4R173135350
V6J4135350
V7N19233430
V6X13132320
V6N73302681
V5B9427480
V3N11126260
V4A18326410
V4E7126260
V4M14226280
V6Y10126260
V3W24225270
V7J29125250
V3A25424790
V3S52624940
V5N5122220
V3L7321490
V5V4221220
V3K15220210
V4S170320320
V5A22320250
V6K3120200
V3E81219230
V3R19219220
V4B5119190
V4W94419240
V5C7119190
V7R25119190
V3Y87118180
V5G12318180
V5H7118180
V5M5118180
V7E20417240
V3C22416200
V4C13416200
V4K135216170
V5X6216170
V6R5216180
V6S4116160

2 districts have ten or more tested homes, which is where these figures start to mean something. 47 districts have no measurement at all and are shaded on the map.

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 1,174 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.