Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in La Paz County, Arizona
EPA puts La Paz County in Zone 2, its middle radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
17.4%
Maricopa County
- Maricopa
- 17.4%
- Riverside
- 1.3%
5 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
17.4%
Maricopa County, 90 miles
- Maricopa
- 17.4%
- Arizona
- 16.8%
Share at 4+ pCi/L, 2,393 tests, 2008 to 2017
Ground above low
None
57.2 pts below Arizona
- La Paz
- 0.0%
- Arizona
- 57.2%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
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 La Paz 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
La Paz County, At a glance
La Paz County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
La Paz County is a
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
No CDC test figures here
CDC has published no radon test figures for La Paz County. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Maricopa County reported the largest share at or above 4 pCi/L, 17.4%, and Riverside County, CA the smallest, 1.3%, with Yavapai County at 16.2%, San Bernardino County, CA at 4.5% and Mohave County at 4.1% between.
La Paz County, Compared
La Paz County radon figures, compared
Calculated by Radon411La Paz County has no radon test figure of its own from CDC, whose counts over the 2008 to 2017 laboratory totals name 13 other Arizona counties and leave it out. Pooled across 13 Arizona counties, 16.8% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Maricopa County reported the largest share at or above 4 pCi/L, 17.4%, and Riverside County, CA the smallest, 1.3%, with Yavapai County at 16.2%, San Bernardino County, CA at 4.5% and Mohave County at 4.1% between. Farther out, Pinal County (163 miles away) at 8.9%, Pima County (170 miles away) at 6.8% and Coconino County (192 miles away) at 30.0% have figures too. Statewide for the same period, Coconino County reported the highest share (30.0%) and Mohave County the lowest (4.1%).
EPA's 1993 map puts La Paz 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 low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
La Paz County, Geology
The ground under La Paz County
PredictedUSGS's geologic map puts all of La Paz County's mapped land in one class: low radon potential. All of it lies in the area the map calls Basin and Range/Sonoran Desert, 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 |
|---|---|---|---|---|
| Basin and Range/Sonoran Desert | Quaternary to Tertiary sediments, with uranium-bearing Tertiary volcanic rocks, highly variable volcanic, metamorphic, and sedimentary rocks, and eolian deposits | Low | 8 | 99.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
La Paz County beside the ground around it
Across Arizona 0.1% of the land is rated high; none of La Paz County's is. Of the 7 counties that border it, 5 have more moderate-potential ground, Yavapai County the most at 90.4%.
The map rates the ground, not the air in any home.
Local help
La Paz County, Local resources
Radon testing and mitigation in La Paz County
- Arizona's radon programArizona Department of Health ServicesArizona's radon program answers questions about testing, mitigation and the rules in Arizona.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 Arizona directoryNo professionals are listed in Arizona yet. The state program can point you to registered testers and mitigators.
What it means
La Paz County, Questions
Questions about radon in La Paz County
Are radon levels high in La Paz County?
No CDC testing statistics are published here for La Paz County, Arizona yet. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Maricopa County reported the largest share at or above 4 pCi/L, 17.4%, and Riverside County, CA the smallest, 1.3%, with Yavapai County at 16.2%, San Bernardino County, CA at 4.5% and Mohave County at 4.1% between.
Which counties border La Paz County?
La Paz County borders 7 counties: Yuma County, AZ, Maricopa County, AZ, Imperial County, CA, Yavapai County, AZ, Riverside County, CA, Mohave County, AZ and San Bernardino County, CA.
Products
La Paz County, Products
Testing a home in La Paz County
No CDC figure names La Paz County; the nearest county with one, Maricopa County (90 miles away), reported 17.4% 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. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in La Paz 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
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
La Paz County, Bordering counties
Counties bordering La Paz County
Calculated by Radon411- Radon levels in Maricopa County, AZEPA zone 2
17.4%at or above 4 pCi/L
Median 1.6 pCi/L · 2,393 tests
- Radon levels in Yavapai County, AZEPA zone 2
16.2%at or above 4 pCi/L
Median 1.6 pCi/L · 265 tests
4.5%at or above 4 pCi/L
Median 0.7 pCi/L · 178 tests
- Radon levels in Mohave County, AZEPA zone 2
4.1%at or above 4 pCi/L
Median 0.2 pCi/L · 49 tests
- Radon levels in Riverside County, CAEPA zone 2
1.3%at or above 4 pCi/L
Median 0.6 pCi/L · 226 tests
- Radon levels in Yuma County, AZEPA zone 2
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 18 tests
- Radon levels in Imperial County, CAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 11 tests
La Paz County, Cities and towns
Cities and towns in La Paz County
The Census Bureau estimates 16,711 residents in La Paz County for July 1, 2025, 149 more than in 2020 (+0.9%). Spread over its land, that is 3.7 people to the square mile. Its largest town, Parker, has 3,394 residents, 20.3% of the total. Together its 2 incorporated places hold 34.6% of those residents; the other 65.4% live outside any of them. CDC publishes no radon test count for La Paz County; across Arizona its counts for 2008 to 2017 come to 0.5 tests for every 1,000 residents (2025 estimate).
From Parker to Quartzsite, CDC publishes no figure by town: each reads La Paz County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Parker | 3,394 | −0.8% | 20.3% |
| Quartzsite | 2,388 | −1.0% | 14.3% |
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).
La Paz County, Homes
Homes in La Paz County
Mobile homes are 59% of La Paz County's 13,653 homes and detached houses 36%, against 64% across Arizona. Half of its homes were built before 1986, close to Arizona's 1992: 5% date from before 1960 and 25% from 2000 or later. 70% of occupied homes are lived in by their owner (Arizona: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | La Paz County | Arizona |
|---|---|---|
| Housing units | 13,653 | 3,142,443 |
| Detached houses | 36% | 64% |
| In buildings of 5 or more | 1% | 16% |
| Mobile homes | 59% | 10% |
| Built before 1960 | 5% | 8% |
| Built since 2000 | 25% | 35% |
| Middle year built | 1986 | 1992 |
| Owner-occupied | 70% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.