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

907 homes across New Brunswick 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

907 measurements shown, and 17 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

25%

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

median reading, Bq/m³

5,590

highest single reading, in E8R

New Brunswick sits 3rd of the 33 places mapped with a hundred or more tested homes, at 24.8% 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 907 homes:

25%

at or above Canada's 200

34%

at or above the US EPA's 148

47%

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
E8N	78	10	311	753	6
E3Y	1,163	13	201	1346	7
E2A	1,937	20	177	1944	10
E8J	174	10	167	354	3
E5K	600	13	163	443	4
E1V	916	56	151	1458	22
E8K	327	11	145	1096	4
E9G	462	28	138	713	10
E8C	17	12	135	386	4
E1N	981	45	122	720	15
E3N	1,441	45	118	1312	12
E9B	568	12	112	994	4
E1X	451	21	98	751	5
E2S	312	10	98	429	3
E1G	448	27	93	1147	6
E8G	1,352	11	93	555	3
E5L	1,553	10	84	161	0
E2K	32	16	80	337	3
E7C	1,066	14	79	985	5
E1H	272	14	73	385	3
E9E	6,211	18	71	381	2
E2E	26	13	69	201	1
E1J	169	15	61	430	2
E2M	120	29	61	814	4
E1B	34	20	60	122	0
E1A	99	21	59	162	0
E8E	1,228	28	56	1330	6
E3V	87	14	53	374	1
E2J	31	20	52	363	1
E1E	34	16	41	108	0
E1C	12	18	37	227	1
E3B	521	17	27	300	1
E2V	282	12	26	76	0

33 districts have ten or more tested homes, which is where these figures start to mean something. The table shows those; 53 districts with thinner samples are on the map but not listed here. The districts with no measurement at all are E4G, E4J, E4K, E4L, E4M, E4N, E4V, E5C, E5E, E5G, E5P, E5R, E5V, E6A, E6B, E6C, E6E, E6G, E6H, E6J, E7N, E8L, E8M, E9C.

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 5,590 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 (Saint John and Moncton CMAs) 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.