Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Alexandria city, Virginia
EPA puts Alexandria city in Zone 3, its lowest radon zone, and most reported tests there come back low, though 7.3% of 410 (2008 to 2017, laboratory totals) 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
7.3%
23.1 pts below VA
- Alexandria city
- 7.3%
- Virginia
- 30.4%
410 tests, 2008 to 2017
Median result
1.0pCi/L
Below action level
- Alexandria city
- 1.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
410
29th of 84 by tests
- Alexandria city
- 410
- Fairfax
- 8,657
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Virginia
80 of 84
Lowest quarter
- Alexandria city
- 7.3%
- Russell
- 67.3%
By share, of 84 with 30+ tests
Read a result for Alexandria city
Starts at Alexandria city's median, 1.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.0 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. Alexandria city's median reported result, 2008 to 2017.
The data
Alexandria city, At a glance
Alexandria city at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 99% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Alexandria city, 2008 to 2017, laboratory
Under 2 pCi/L: 78%2 to 4 pCi/L: 15%4 pCi/L and above: 7%
Of 410 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 320 | 78.0% |
| 2 to 4 pCi/L | 60 | 14.6% |
| 4 pCi/L and above | 30 | 7.3% |
What these figures count
These are the 410 tests reported to CDC for Alexandria city over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Alexandria city, Compared
Alexandria city radon figures, compared
Calculated by Radon411Alexandria city reports fewer high tests than Virginia overall. 7.3% of its 410 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 23.1 points below the 30.4% pooled from 131 Virginia counties.
Ordered from highest share down, it comes 80th of 84 Virginia counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Alexandria city sits 28.4 points below it.
Next door, the shares run from 8.7% in District of Columbia, DC to 19.0% in Prince George's County, MD. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 7.3% share point the same way here.
Half the tests came in under 1.0 pCi/L and half over it; the single highest reached 57.4 pCi/L. The rest split 78.0% under 2 pCi/L and 14.6% from 2 to 4 (Virginia: 44.7% and 24.9%).
CDC's ten-year totals for Alexandria city went from 305 tests (2005 to 2014) to 410 (2008 to 2017), the share going from 7.5% to 7.3%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Alexandria city, Geology
The ground under Alexandria city
PredictedUSGS's geologic map puts all of Alexandria city's mapped land in one class: low radon potential. 99.5% of it lies in the area the map calls Cretaceous Coastal Plain Sediments, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Cretaceous Coastal Plain Sediments | Cretaceous Coastal Plain sand, silt, clay. | Low | 8 | 99.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Alexandria city beside the ground around it
Across Virginia 47.9% of the land is rated high; none of Alexandria city's is. Every one of the 4 counties that border it has more high-potential ground, Fairfax County the most at 61.1%.
The map rates the ground, not the air in any home.
Local help
Alexandria city, Local resources
Radon testing and mitigation in Alexandria city
- VDH Radon ProgramVDH Radon Program answers questions about testing, mitigation and the rules in Virginia.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 Virginia2 professionals are listed in Virginia.
What Virginia's program says
- Phone
- (804) 864-8161
- Radon@vdh.virginia.gov
- Licensing of radon professionals
The Code of Virginia requires that Radon testers and mitigators be currently certified by either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).
What it means
Alexandria city, Questions
Questions about radon in Alexandria city
Are radon levels high in Alexandria city?
Over the 2008 to 2017 laboratory totals, 7.3% of the radon tests reported to CDC for Alexandria city, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 79 reported a higher share; pooled, the state comes to 30.4%.
Which counties border Alexandria city?
Alexandria city borders 4 counties: Arlington County, VA, District of Columbia, DC, Prince George's County, MD and Fairfax County, VA.
Products
Alexandria city, Products
Testing a home in Alexandria city
In Alexandria city, 7.3% of 410 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.4% pooled across Virginia. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Alexandria city.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Alexandria city, Bordering counties
Counties bordering Alexandria city
Calculated by Radon41119.0%at or above 4 pCi/L
Median 1.4 pCi/L · 1,603 tests · 11.7 points above Alexandria city
- Radon levels in Fairfax County, VAEPA zone 1
18.7%at or above 4 pCi/L
Median 1.5 pCi/L · 8,657 tests · 11.4 points above Alexandria city
- Radon levels in Arlington County, VAEPA zone 2
13.7%at or above 4 pCi/L
Median 1.4 pCi/L · 1,101 tests · 6.4 points above Alexandria city
- Radon levels in District of Columbia, DCEPA zone 3
8.7%at or above 4 pCi/L
Median 1.2 pCi/L · 2,126 tests · 1.4 points above Alexandria city
Alexandria city, Cities and towns
Cities and towns in Alexandria city
The Census Bureau estimates 160,662 residents in Alexandria city for July 1, 2025, 1,515 more than in 2020 (+1.0%). Packed into its land, that is 10,757 people per square mile. Alexandria, its one incorporated place, has 160,662 residents, 100.0% of the total. Reported testing is thin here: 410 tests over 2008 to 2017, or 2.6 for every 1,000 residents (2025 estimate), where Virginia as a whole comes to 6.0.
Alexandria is the one incorporated place here; CDC publishes no figure by town, so it reads Alexandria city's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Alexandria | 160,662 | +1.0% | 100.0% |
One incorporated place, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Alexandria city, Homes
Homes in Alexandria city
Alexandria city has 80,570 homes, and many share a building: 61% are in buildings of five or more, 14% are detached houses, against 61% across Virginia. The homes are older than Virginia's as a whole: half were built before 1974 (1984 for Virginia), and 29% date from before 1960. Most occupied homes here are rented: owners live in 42% (Virginia: 67%). A tenant can run a test; a fix is the landlord's to make.
| Homes | Alexandria city | Virginia |
|---|---|---|
| Housing units | 80,570 | 3,654,784 |
| Detached houses | 14% | 61% |
| In buildings of 5 or more | 61% | 19% |
| Mobile homes | under 1% | 4% |
| Built before 1960 | 29% | 19% |
| Built since 2000 | 21% | 25% |
| Middle year built | 1974 | 1984 |
| Owner-occupied | 42% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.