Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Kings County, California
EPA puts Kings County in Zone 3, its lowest radon zone, and only 2 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
Highest bordering
23.8%
Tulare County
- Tulare
- 23.8%
- Fresno
- 11.0%
5 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
11.0%
Fresno County, 48 miles
- Fresno
- 11.0%
- California
- 10.3%
Share at 4+ pCi/L, 100 tests, 2008 to 2017
Ground above low
25.2%
17.5 pts below California
- Kings
- 25.2%
- California
- 42.7%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Kings
- 2
- 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 Kings 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
Kings County, At a glance
Kings County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 75% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Kings County, 2008 to 2017, laboratory
CDC holds 2 reported tests for Kings County over the 2008 to 2017 laboratory totals, with a median of 1.7 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Kings County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Kings 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).
Kings County, Compared
Kings County radon figures, compared
Calculated by Radon411CDC's largest figure for Kings County rests on 2 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 2.2 pCi/L, with a middle value of 1.7 pCi/L.
Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Tulare County reported the largest share at or above 4 pCi/L, 23.8%, and Fresno County the smallest, 11.0%, with Monterey County at 14.9%, San Luis Obispo County at 12.5% and Kern County at 11.6% between. Farther out, Madera County (79 miles away) at 14.7%, Santa Barbara County (97 miles away) at 17.6% and Ventura County (119 miles away) at 11.9% have figures too. Pooled across 56 California counties, 10.3% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, El Dorado County reported the highest share (30.3%) and Sonoma County the lowest (0.8%). EPA's 1993 map puts Kings County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 75% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Kings County, Geology
The ground under Kings County
PredictedUSGS's geologic map splits Kings County: 74.8% of its land is low radon potential and 25.2% moderate. The map puts 74.8% of Kings County in the area it calls Great Valley and 25.2% in Southern Coast Ranges. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Great Valley | Quaternary alluvial gravel, sand, silt, clay. | Low | 8 | 74.8% |
| Southern Coast Ranges | Metamorphosed marine sedimentary rocks, ultramafic rocks, Triasic metamorphic rocks, Mesozoic granitic rocks, and a series of fault-bounded linear basins in which Teriary marine and continental sedimentary rocks were deposited. | Moderate | 9 | 25.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Kings County beside the ground around it
Across California 0.1% of the land is rated high; none of Kings County's is. Every one of the 5 counties that border it has more moderate-potential ground, Monterey County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Kings County, Local resources
Radon testing and mitigation in Kings County
- California Indoor Radon ProgramCalifornia Indoor Radon Program, run by California Department of Public Health, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in California.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Discounted test kits can be purchased through our partner laboratory, Alpha Energy, for $14.95.
- Compare kits
- Professionals in California4 professionals are listed in California.
What California's program says
- Phone
- 1-800-745-7236
- Radonprogram@cdph.ca.gov
- Licensing of radon professionals
The Radon Program certifies all radon service providers operating in California.
What it means
Kings County, Questions
Questions about radon in Kings County
Are radon levels high in Kings County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Kings County, California were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Tulare County reported the largest share at or above 4 pCi/L, 23.8%, and Fresno County the smallest, 11.0%, with Monterey County at 14.9%, San Luis Obispo County at 12.5% and Kern County at 11.6% between.
Which counties border Kings County?
Kings County borders 5 counties: Fresno County, Tulare County, San Luis Obispo County, Kern County and Monterey County.
Products
Kings County, Products
Testing a home in Kings County
No CDC figure names Kings County; the nearest county with one, Fresno County (48 miles away), reported 11.0% of its tests at or above 4 pCi/L over the 2008 to 2017 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 Kings 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
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Kings County, Bordering counties
Counties bordering Kings County
Calculated by Radon411- Radon levels in Tulare CountyEPA zone 2
23.8%at or above 4 pCi/L
Median 1.7 pCi/L · 80 tests
- Radon levels in Monterey CountyEPA zone 2
14.9%at or above 4 pCi/L
Median 0.8 pCi/L · 87 tests
- Radon levels in San Luis Obispo CountyEPA zone 2
12.5%at or above 4 pCi/L
Median 1.0 pCi/L · 80 tests
- Radon levels in Kern CountyEPA zone 2
11.6%at or above 4 pCi/L
Median 1.8 pCi/L · 121 tests
- Radon levels in Fresno CountyEPA zone 2
11.0%at or above 4 pCi/L
Median 1.5 pCi/L · 100 tests
Kings County, Cities and towns
Cities and towns in Kings County
The Census Bureau estimates 154,327 residents in Kings County for July 1, 2025, 1,514 more than in 2020 (+1.0%). That works out to 111 people per square mile of land. Its largest town, Hanford, has 62,229 residents, 40.3% of the total. Together its 4 incorporated places hold 81.2% of those residents; the other 18.8% live outside any of them. Reported testing is thin here: 2 tests over 2008 to 2017, or under 0.1 for every 1,000 residents (2025 estimate), where California as a whole comes to 0.2.
From Hanford to Avenal, CDC publishes no figure by town: each reads Kings County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hanford | 62,229 | +4.5% | 40.3% |
| Lemoore | 27,291 | +0.6% | 17.7% |
| Corcoran | 22,358 | −1.6% | 14.5% |
| Avenal | 13,479 | +0.1% | 8.7% |
4 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).
Kings County, Homes
Homes in Kings County
Of Kings County's 46,695 homes, 71% are detached houses, against 57% across California; 11% are in buildings of five or more homes. Much of Kings County is recent building: 27% of its homes have gone up since 2000 and the middle year built is 1986, against 1976 for California. 55% of occupied homes are lived in by their owner (California: 56%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Kings County | California |
|---|---|---|
| Housing units | 46,695 | 14,532,683 |
| Detached houses | 71% | 57% |
| In buildings of 5 or more | 11% | 24% |
| Mobile homes | 5% | 4% |
| Built before 1960 | 17% | 27% |
| Built since 2000 | 27% | 18% |
| Middle year built | 1986 | 1976 |
| Owner-occupied | 55% | 56% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.