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

567 homes across Newfoundland and Labrador 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.

under 100100 to 147148 to 199200 and aboveno homes tested

567 measurements shown, and 1 more with no district recorded that cannot be placed. 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 Newfoundland and Labrador homes at or above Canada's 200 Bq/m³ action level
42
median reading, Bq/m³
1,548
highest single reading, in A0G

Newfoundland and Labrador sits 22nd of the 33 places mapped with a hundred or more tested homes, at 8.5% 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 567 homes:

8%
at or above Canada's 200
14%
at or above the US EPA's 148
27%
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
A2N50251155248
A1H154111022101
A1S1583991560
A1N1621962521
A8A4,646168913865
A0L1,49116876284
A1L304791080
A0N12,01228743973
A1A4223742011
A1B5216743301
A1Y1314743231
A0B4,1532691220
A5A8564681280
A1E1425672513
A1W23255780
A1G1113531960
A0C2,7334481400
A1K86245690
A1C4842780
A0K58,46677384015
A2H1,49534383591
A0J1,8239372711
A0H20,86828368315
A0A4,13711314441
A0G15,500473115482
A2B285311110
A0E6,36611301810
A1X363304471
A0M3,4935281680
A2V3438282021
A1V10521262701
A2A2717242371
A0R64,9651022430
A0P154,11024206341

21 districts have ten or more tested homes, which is where these figures start to mean something. The districts with no measurement at all are A1M.

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 1,548 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 (St John's CMA) 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.