Locations and reports
Radon in Apex, North Carolina
EPA puts Wake County, where Apex is, in Zone 2, its middle radon zone, and most reported tests there come back low, though 2.3% of 88 (2022) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
2.3%
8.4 pts below NC
- Wake
- 2.3%
- NC
- 10.7%
Wake, 2nd of 4 in NC, 2022
Median result
0.1pCi/L
Below action level
- Wake
- 0.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Wake's tests, 2022
Nearest county
1.5%
Wayne, 55 miles
- Wayne
- 1.5%
- Wake
- 2.3%
67 tests, 2022
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
Wake, where Apex is
Tests reported
88
In Wake
- Wake
- 88
- Wayne
- 67
Reported to CDC before any fix, 2022
Read a result for Apex
Starts at Wake County's median, 0.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.2 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. 0.1 pCi/L above Wake County's median of 0.1 pCi/L.
The data
Apex, What is published
What is published for Apex
Every figure for Apex is a county's
Radon data is published by county, not by city, so for Apex it is Wake County's: its EPA zone (Zone 2) and the 88 tests reported to CDC for 2022. Only a test tells you about one home.
Apex covers 22 square miles of land, all of it in Wake County. About 80,419 people live there, 3,658 to the square mile.
Apex, Counties
The county Apex lies in
MeasuredWake County's EPA zone and the figures CDC publishes for it, 2022.
Wake CountyZone 2Moderate predicted potential
- 2.3%
- Reported tests at or above 4 pCi/L
- 0.1 pCi/L
- Median reported result
- 88 tests
- Tests reported to CDC
- 4
- Annual years on file
Wake County ranks 2nd of 4 North Carolina counties with 30 or more tests for that period, 8.4 points below the 10.7% pooled across North Carolina's counties, 21.6 points below the national pool of 23.9%.
The counties nearest Apex with a CDC figure for 2022, measured from the middle of the city: Wayne County (55 miles, 1.5% of 67 tests), Pitt County (85 miles, 0.9% of 116 tests) and Buncombe County (206 miles, 38.0% of 50 tests). Their shares run from 0.9% to 38.0%.
No business in the directory gives Apex as its address; the North Carolina list covers it. North Carolina's other cities with a page of their own: Raleigh, Asheville, Charlotte and Boone.
The counties around Apex
By distance from the middle of Apex; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2022.
Apex, Geology
The ground under Apex
PredictedUSGS's geologic map splits Apex: 69.6% of its land is low radon potential and 30.4% moderate. The map puts 69.6% of Apex in the area it calls Sanford-Durham Sub-Basins and 30.4% in Raleigh Belt. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Sanford-Durham Sub-Basins | Arkosic sandstone, siltstone and conglomerate. | Low | 8 | 69.6% |
| Raleigh Belt | Proterozoic through Cambrian biotite gneiss and mica schist. | Moderate | 11 | 30.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Apex beside its county and North Carolina
Wake County as a whole has more moderate-potential ground than Apex: 79.4% of the county against 30.4% of the city. Across North Carolina 1.3% of the land is rated high; none of Apex's is.
The map rates the ground, not the air in any home.
Apex, Homes
Homes in Apex
Of Apex's 25,148 homes, 68% are detached houses, against 59% across Wake County; 14% are in buildings of five or more homes. Much of Apex is recent building: 67% of its homes have gone up since 2000 and the middle year built is 2007, against 1999 for Wake County. Owners live in 75% of the occupied homes (Wake County: 64%), so for most households a test and a fix are their own to order.
| Homes | Apex | Wake County | North Carolina |
|---|---|---|---|
| Housing units | 25,148 | 481,999 | 4,815,195 |
| Detached houses | 68% | 59% | 65% |
| In buildings of 5 or more | 14% | 24% | 14% |
| Mobile homes | 1% | 3% | 11% |
| Built before 1960 | 2% | 6% | 14% |
| Built since 2000 | 67% | 48% | 33% |
| Middle year built | 2007 | 1999 | 1990 |
| Owner-occupied | 75% | 64% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Apex, Local resources
Local resources for Apex
Who to ask in North Carolina: its radon program, test kits and professionals.
- North Carolina Radon ProgramRun by NCDHHS.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in North CarolinaRadon testers and mitigators in North Carolina, each with how its listing was checked.
The program's own words on licensing are on the North Carolina page.
What it means
Apex, Questions
Questions about radon in Apex
What radon zone is Apex in?
EPA's map puts Wake County, and with it Apex, in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.
What are radon levels in Apex?
Only 2.3% of 88 tests from Wake County for 2022 reached 4 pCi/L, so reported levels around Apex run low. The median reported result was 0.1 pCi/L. Low is not none.
Should I test my home in Apex?
Yes, even here. 2 of 88 tests reported from Wake County were at or above 4 pCi/L. That is below North Carolina's pooled 10.7%, and still not a reason to skip it. Those homes were found by testing, not by the county's low share. How to test a home.
What ground is Apex built on, as far as radon goes?
69.6% of Apex sits on what USGS's map calls "Sanford-Durham Sub-Basins", rated low for radon potential, radon index 8; another 30.4% is "Raleigh Belt", rated moderate for radon potential, radon index 11. So the ground changes within Apex itself.
Is radon higher in the counties around Apex?
Some are and some are not. Against Wake County's 2.3%, 1 of the 3 nearest counties with a figure report more and 2 less, from Pitt County (0.9%, 85 miles off) to Buncombe County (38.0%, 206 miles off).
The answers use the published figures of Wake County, the county Apex lies in.
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