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

254 homes across Victoria 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 V8 and V9. The whole province is on the British Columbia map.

under 100100 to 147148 to 199200 and aboveno homes tested

254 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

4%
of tested Victoria homes at or above Canada's 200 Bq/m³ action level
31
median reading, Bq/m³
886
highest single reading, in V8G

Victoria sits 31st of the 33 places mapped with a hundred or more tested homes, at 3.9% 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 254 homes:

4%
at or above Canada's 200
7%
at or above the US EPA's 148
14%
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
V9R6311201200
V8G9,72256848869
V9P1195551570
V9A13645690
V8Y11341530
V9B711241780
V9E179841560
V8T5636740
V8Z1912361190
V8L45335770
V8N151235610
V9L6277352421
V9J188134340
V9X1,384333820
V8P94321260
V8S7732410
V8A8089301430
V8B3,135330360
V9G1247291400
V8X13928650
V9Y1,726828610
V9C1018261740
V9K395226300
V8M45124240
V9N831523340
V8C2391422910
V8V5621260
V9Z149421830
V8R8920450
V9T27420220
V9V6319200
V8K183418390
V9W89518240
V8J3,028217190
V9M29417260
V9H2,881116160

5 districts have ten or more tested homes, which is where these figures start to mean something. The districts with no measurement at all are V8E, V8W, V9S.

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 886 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.