Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Garfield County, Oklahoma
EPA puts Garfield County in Zone 3, its lowest radon zone, and only 5 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
8.9%
Oklahoma County, 61 miles
- Oklahoma
- 8.9%
- Oklahoma
- 12.6%
Share at 4+ pCi/L, 135 tests, 2006 to 2015
Ground above low
None
15.2 pts below Oklahoma
- Garfield
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
8
Too few for a share
- Garfield
- 8
- Needed
- 30
2007 to 2016, 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 Garfield 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
Garfield County, At a glance
Garfield County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Garfield County, 2008 to 2017, laboratory
CDC holds 5 reported tests for Garfield County over the 2008 to 2017 laboratory totals, with a median of 2.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Garfield County beside the counties around it is how this page reads it.
What these figures count
Only 5 tests were reported to CDC for Garfield 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).
Garfield County, Compared
Garfield County radon figures, compared
Calculated by Radon411CDC's largest figure for Garfield County rests on 8 tests over the 2007 to 2016 laboratory totals, 2 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 6.4 pCi/L, with a middle value of 2.3 pCi/L.
The nearest counties with a figure are Oklahoma County (61 miles away) at 8.9%, Tulsa County (104 miles away) at 6.0% and Washington County (107 miles away) at 11.3%. Pooled across 53 Oklahoma counties, 12.6% of reported tests reached that level; across every county in the country with a figure, 36.3%.
Statewide for the same period, Delaware County reported the highest share (44.7%) and Tulsa County the lowest (6.0%). EPA's 1993 map puts Garfield County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Garfield County, Geology
The ground under Garfield County
PredictedUSGS's geologic map puts all of Garfield County's mapped land in one class: low radon potential. All of it lies in the area the map calls Central Oklahoma Plains and Hills, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Oklahoma Plains and Hills | Nonmarine Permian and Tertiary rocks, including shale, sandstone, and conglomerate in the western part, and Mississippian and Pennsylvanian rocks in the eastern part. | Low | 7 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Garfield County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Garfield County's is. None of the 7 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Garfield County, Local resources
Radon testing and mitigation in Garfield County
- Oklahoma's radon programDepartment of Environmental QualityOklahoma's radon program answers questions about testing, mitigation and the rules in Oklahoma.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
- See the Oklahoma directoryNo professionals are listed in Oklahoma yet. The state program can point you to registered testers and mitigators.
What it means
Garfield County, Questions
Questions about radon in Garfield County
Are radon levels high in Garfield County?
Over the 2008 to 2017 laboratory totals, 40.0% of the radon tests reported to CDC for Garfield County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of the 5 nearest counties with a figure, within 166 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Garfield County?
Garfield County borders 7 counties: Kingfisher County, Noble County, Logan County, Grant County, Major County, Alfalfa County and Kay County.
Products
Garfield County, Products
Testing a home in Garfield County
No CDC figure names Garfield County; the nearest county with one, Oklahoma County (61 miles away), reported 8.9% 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 Garfield County.
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
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Garfield County, Bordering counties
Counties bordering Garfield County
Calculated by Radon411- Radon levels in Alfalfa CountyEPA zone 3
100.0%at or above 4 pCi/L
Median 29.3 pCi/L · 1 test
- Radon levels in Grant CountyEPA zone 3
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 6 tests
- Radon levels in Kay CountyEPA zone 3
27.6%at or above 4 pCi/L
Median 2.5 pCi/L · 29 tests
- Radon levels in Kingfisher CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 1 test
- Radon levels in Noble CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 1 test
- Radon levels in Logan CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 6 tests
- Radon levels in Major CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 2.7 pCi/L · 2 tests
Garfield County, Cities and towns
Cities and towns in Garfield County
About 61,779 people live in Garfield County by the Census Bureau's estimate for July 1, 2025, 920 fewer than in 2020 (−1.5%). That works out to 58 people per square mile of land. Enid alone is home to 50,297 of them, 81.4% of the total. Together its 14 incorporated places hold 90.2% of those residents; the other 9.8% live outside any of them. Reported testing is thin here: 8 tests over 2007 to 2016, or 0.1 for every 1,000 residents (2025 estimate), where Oklahoma as a whole comes to 0.2.
From Enid to Douglas, CDC publishes no figure by town: each reads Garfield County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Enid | 50,297 | −1.6% | 81.4% |
| Waukomis | 1,324 | −1.6% | 2.1% |
| North Enid | 999 | −1.4% | 1.6% |
| Garber | 732 | −2.3% | 1.2% |
| Lahoma | 527 | −2.2% | 0.9% |
| Covington | 466 | −1.1% | 0.8% |
| Drummond | 457 | +0.7% | 0.7% |
| Kremlin | 248 | +0.4% | 0.4% |
| Breckenridge | 212 | −0.9% | 0.3% |
| Hunter | 143 | −1.4% | 0.2% |
| Fairmont | 129 | −1.5% | 0.2% |
| Carrier | 91 | −2.2% | 0.1% |
- Hillsdale
- Douglas
14 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).
Garfield County, Homes
Homes in Garfield County
Garfield County is a place of houses on their own lots: 79% of its 27,782 homes are detached single-family houses, against 73% across Oklahoma. The homes are older than Oklahoma's as a whole: half were built before 1971 (1980 for Oklahoma), and 35% date from before 1960. 65% of occupied homes are lived in by their owner (Oklahoma: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Garfield County | Oklahoma |
|---|---|---|
| Housing units | 27,782 | 1,763,036 |
| Detached houses | 79% | 73% |
| In buildings of 5 or more | 8% | 12% |
| Mobile homes | 5% | 9% |
| Built before 1960 | 35% | 21% |
| Built since 2000 | 12% | 25% |
| Middle year built | 1971 | 1980 |
| Owner-occupied | 65% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.