Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Harding County, New Mexico
EPA puts Harding County in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2006 to 2015, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
44.4%
San Miguel County
- San Miguel
- 44.4%
1 of 5 neighbours have 30+ tests, 2006 to 2015
Nearest county
44.4%
San Miguel County, 62 miles
- San Miguel
- 44.4%
- New Mexico
- 30.3%
Share at 4+ pCi/L, 36 tests, 2006 to 2015
Ground above low
100.0%
7.4 pts above New Mexico
- Harding
- 100.0%
- New Mexico
- 92.6%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Harding
- 1
- Needed
- 30
2006 to 2015, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Harding 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
Harding County, At a glance
Harding County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Harding County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Harding County, 2006 to 2015, laboratory
CDC holds 1 reported test for Harding County over the 2006 to 2015 laboratory totals, a result of 3.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Harding County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Harding County over 2006 to 2015 (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: 2006 to 2015, laboratory. Measured data period: 2005 to 2015 (every CDC figure on file).
Harding County, Compared
Harding County radon figures, compared
Calculated by Radon411CDC's largest figure for Harding County rests on 1 test over the 2006 to 2015 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 3.3 pCi/L, with a middle value of 3.3 pCi/L.
San Miguel County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 44.4% of its tests at or above 4 pCi/L. Farther out, Taos County (113 miles away) at 71.9%, Santa Fe County (124 miles away) at 32.5% and Los Alamos County (140 miles away) at 38.3% have figures too. Pooled across 30 New Mexico counties, 30.3% of reported tests reached that level; across every county in the country with a figure, 36.3%.
Statewide for the same period, Taos County reported the highest share (71.9%) and Otero County the lowest (10.7%). EPA's 1993 map puts Harding County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Harding County, Geology
The ground under Harding County
PredictedUSGS's geologic map puts all of Harding County's mapped land in one class: moderate radon potential. The map puts 54.5% of Harding County in the area it calls Great Plains Pecos Valley Section and 26.7% in Southern Great Plains, with one smaller area beside them. USGS gives the first a radon index of 9 and the second 10, both in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Great Plains Pecos Valley Section | Triassic sandstone, siltstone, mudstone, Quaternary alluvial and eolian sand and silt. | Moderate | 9 | 54.5% |
| Southern Great Plains | Cretaceous sedimentary rocks including sandstone and shale. | Moderate | 10 | 26.7% |
| High Plains | Sandstone, siltstone, minor shale-Tertiary Ogallala Formation. | Moderate | 9 | 18.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Harding County beside the ground around it
Across New Mexico 19.2% of the land is rated high; none of Harding County's is. Of the 5 counties that border it, 4 have more high-potential ground, Union County the most at 33.0%.
The map rates the ground, not the air in any home.
Local help
Harding County, Local resources
Radon testing and mitigation in Harding County
- New Mexico Indoor Radon Outreach ProgramNew Mexico Indoor Radon Outreach Program, run by New Mexico Environment Department, does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in New Mexico.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The New Mexico Environment Department seasonally distributes free radon testing kits to the public on a first-come, first-served basis.
- Compare kits
- See the New Mexico directoryNo professionals are listed in New Mexico yet. The state program can point you to registered testers and mitigators.
What New Mexico's program says
- Phone
- (505) 476-8600
- radon.questions@env.nm.gov
- Licensing of radon professionals
There is not currently a certification program within the state.
What it means
Harding County, Questions
Questions about radon in Harding County
Are radon levels high in Harding County?
Over the 2006 to 2015 laboratory totals, 0.0% of the radon tests reported to CDC for Harding County, New Mexico were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. San Miguel County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 44.4% of its tests at or above 4 pCi/L.
Which counties border Harding County?
Harding County borders 5 counties: Union County, Quay County, San Miguel County, Mora County and Colfax County.
Products
Harding County, Products
Testing a home in Harding County
No CDC figure names Harding County; the nearest county with one, San Miguel County (62 miles away), reported 44.4% 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. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Harding County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
RM-63Pro rechargeable radon monitor with a touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Harding County, Bordering counties
Counties bordering Harding County
Calculated by Radon411- Radon levels in Union CountyEPA zone 2
100.0%at or above 4 pCi/L
Median 4.1 pCi/L · 1 test
- Radon levels in Quay CountyEPA zone 2
66.7%at or above 4 pCi/L
Median 5.0 pCi/L · 3 tests
- Radon levels in Colfax CountyEPA zone 1
61.1%at or above 4 pCi/L
Median 5.7 pCi/L · 18 tests
- Radon levels in San Miguel CountyEPA zone 1
44.4%at or above 4 pCi/L
Median 3.5 pCi/L · 36 tests
- Radon levels in Mora CountyEPA zone 1
42.9%at or above 4 pCi/L
Median 3.4 pCi/L · 7 tests
Harding County, Cities and towns
Cities and towns in Harding County
Harding County has been losing residents: from 652 in 2020 to 617 on July 1, 2025, a fall of 5.4% by the Census Bureau's estimates. Spread over its land, that is 0.3 people to the square mile. Its largest town, Roy, has 185 residents, 30.0% of the total. CDC's 1 reported test for 2006 to 2015 work out to 1.6 per 1,000 residents (2025 estimate), close to New Mexico's 2.0.
From Roy to Mosquero, CDC publishes no figure by town: each reads Harding County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Roy | 185 | −3.6% | 30.0% |
| Mosqueroextends beyond Harding County | 90 | −7.2% | Counted whole |
2 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 Harding County is counted whole, so it has no share.
Harding County, Homes
Homes in Harding County
Harding County is a place of houses on their own lots: 75% of its 489 homes are detached single-family houses, against 65% across New Mexico. The homes are older than New Mexico's as a whole: half were built before 1955 (1984 for New Mexico), and 54% date from before 1960. Owners live in 78% of the occupied homes (New Mexico: 69%), so for most households a test and a fix are their own to order.
| Homes | Harding County | New Mexico |
|---|---|---|
| Housing units | 489 | 949,524 |
| Detached houses | 75% | 65% |
| In buildings of 5 or more | 0% | 10% |
| Mobile homes | 23% | 16% |
| Built before 1960 | 54% | 17% |
| Built since 2000 | 8% | 24% |
| Middle year built | 1955 | 1984 |
| Owner-occupied | 78% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.