Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Northampton County, Virginia
EPA puts Northampton County in Zone 3, its lowest radon zone, and only 8 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
5.3%
Norfolk city, 37 miles
- Norfolk city
- 5.3%
- Virginia
- 30.7%
Share at 4+ pCi/L, 57 tests, 2006 to 2015
Ground above low
None
77.9 pts below Virginia
- Northampton
- 0.0%
- Virginia
- 77.9%
Share of land USGS rates moderate or high potential
Tests reported
8
Too few for a share
- Northampton
- 8
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Northampton County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Northampton County, At a glance
Northampton County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 46% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Northampton County, 2008 to 2017, laboratory
CDC holds 8 reported tests for Northampton County over the 2008 to 2017 laboratory totals, with a median of 1.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Northampton County beside the counties around it is how this page reads it.
What these figures count
Only 8 tests were reported to CDC for Northampton County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Northampton County, Compared
Northampton County radon figures, compared
Calculated by Radon411CDC's largest figure for Northampton County rests on 8 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 1.7 pCi/L, with a middle value of 1.0 pCi/L.
The nearest counties with a figure are Norfolk city (37 miles away) at 5.3%, Newport News city (39 miles away) at 5.9% and Virginia Beach city (43 miles away) at 7.4%. Pooled across 132 Virginia counties, 30.7% of reported tests reached that level; across every county in the country with a figure, 36.3%.
Statewide for the same period, Russell County reported the highest share (68.5%) and Norfolk city the lowest (5.3%). EPA's 1993 map puts Northampton County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 46% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Northampton County, Geology
The ground under Northampton County
PredictedUSGS's geologic map puts all of Northampton County's mapped land in one class: low radon potential. 46.2% of it lies in the area the map calls Quaternary Coastal Plain Sediments, to which USGS gives a radon index of 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Quaternary Coastal Plain Sediments | Quaternary coastal sand and silt containing monazite. | Low | 6 | 46.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Northampton County beside the ground around it
Across Virginia 47.9% of the land is rated high; none of Northampton County's is. None of the one county that borders it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Northampton County, Local resources
Radon testing and mitigation in Northampton County
- 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
Northampton County, Questions
Questions about radon in Northampton County
Are radon levels high in Northampton County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Northampton County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of the 8 nearest counties with a figure, within 89 miles, the share of tests at or above 4 pCi/L runs from 5.3% to 38.4%.
Which counties border Northampton County?
Northampton County borders 1 county: Accomack County.
Products
Northampton County, Products
Testing a home in Northampton County
No CDC figure names Northampton County; the nearest county with one, Norfolk city (37 miles away), reported 5.3% of its tests at or above 4 pCi/L over the 2006 to 2015 laboratory totals, the only reading nearby until a test of this home. 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 Northampton County.
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
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Northampton County, Bordering counties
Counties bordering Northampton County
Calculated by Radon411- Radon levels in Accomack CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 11 tests
Northampton County, Cities and towns
Cities and towns in Northampton County
About 11,879 people live in Northampton County by the Census Bureau's estimate for July 1, 2025, 338 fewer than in 2020 (−2.8%). That works out to 56 people per square mile of land. No town dominates: Exmore, the largest, has 1,396 residents, 11.8% of the total. Reported testing is thin here: 8 tests over 2008 to 2017, or 0.7 for every 1,000 residents (2025 estimate), where Virginia as a whole comes to 6.0.
From Exmore to Eastville, CDC publishes no figure by town: each reads Northampton County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Exmore | 1,396 | −4.5% | 11.8% |
| Cape Charles | 1,314 | +11.4% | 11.1% |
| Belle Havenextends beyond Northampton County | 544 | +0.2% | Counted whole |
| Nassawadox | 512 | −3.6% | 4.3% |
| Cheriton | 446 | −8.0% | 3.8% |
| Eastville | 286 | −4.7% | 2.4% |
6 incorporated places, 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). A place that extends beyond Northampton County is counted whole, so it has no share.
Northampton County, Homes
Homes in Northampton County
Northampton County is a place of houses on their own lots: 76% of its 7,456 homes are detached single-family houses, against 61% across Virginia. Half of its homes were built before 1978, close to Virginia's 1984: 35% date from before 1960 and 29% from 2000 or later. 65% of occupied homes are lived in by their owner (Virginia: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Northampton County | Virginia |
|---|---|---|
| Housing units | 7,456 | 3,654,784 |
| Detached houses | 76% | 61% |
| In buildings of 5 or more | 6% | 19% |
| Mobile homes | 12% | 4% |
| Built before 1960 | 35% | 19% |
| Built since 2000 | 29% | 25% |
| Middle year built | 1978 | 1984 |
| Owner-occupied | 65% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.