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 Rich County, Utah
EPA puts Rich County in Zone 2, its middle radon zone, and only 13 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
59.4%
Morgan County
- Morgan
- 59.4%
- Weber
- 28.6%
4 of 8 neighbours have 30+ tests, 2023
Nearest county
53.8%
Cache County, 27 miles
- Cache
- 53.8%
- Utah
- 36.1%
Share at 4+ pCi/L, 994 tests, 2023
Ground above low
100.0%
Level with Utah
- Rich
- 100.0%
- Utah
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
21
Too few for a share
- Rich
- 21
- Needed
- 30
2022
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 Rich 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
Rich County, At a glance
Rich County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Rich County is a
USGS geologic potential: High across 67% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Rich County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 25.0% |
| 2015 | 33.3% |
| 2016 | 33.3% |
| 2017 | 33.3% |
| 2018 | 33.3% |
| 2020 | 60.0% |
| 2021 | 100.0% |
| 2022 | 28.6% |
| 2023 | 53.8% |
2023: 53.8%. Across these years the share ran from 25.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 13 tests were reported to CDC for Rich County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Rich County, Compared
Rich County radon figures, compared
Calculated by Radon411CDC's largest figure for Rich County rests on 21 tests in 2022, 6 of them at or above 4 pCi/L, so each test moves its share by 4.8 points and no rank or comparison is drawn from it. Results reached as high as 6.4 pCi/L, with a middle value of 1.5 pCi/L.
Of the counties bordering it, 4 have a figure in 2023: Morgan County reported the largest share at or above 4 pCi/L, 59.4%, and Weber County the smallest, 28.6%, with Cache County at 53.8% and Summit County at 32.6% between. Farther out, Davis County (63 miles away) at 28.4%, Salt Lake County (75 miles away) at 33.1% and Wasatch County (90 miles away) at 51.9% have figures too. Pooled across 29 Utah counties, 36.1% of reported tests reached that level; across every county in the country with a figure, 33.4%.
Statewide for the same period, Beaver County reported the highest share (66.7%) and Washington County the lowest (9.9%). EPA's 1993 map puts Rich County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 67% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Rich County, Geology
The ground under Rich County
PredictedUSGS's geologic map splits Rich County: 66.7% of its land is high radon potential and 33.3% moderate. The map puts 66.7% of Rich County in the area it calls Northern Rocky Mountains and 22.2% in Basin and Range, with 2 smaller areas beside them. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northern Rocky Mountains | Tertiary sandstone, mudstone, limestone. | High | 13 | 66.7% |
| Basin and Range | Cenozoic to Paleozoic sedimentary rocks. | Moderate | 11 | 22.2% |
| Middle Rocky Mountain province | Complexly folded, faulted, and metamorphosed rocks of volcanic origin. | Moderate | 11 | 6.3% |
| Overthrust Belt | Late Paleozoic sedimentary or Precambrian igneous rocks. | Moderate | 11 | 4.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Rich County beside the ground around it
Rich County has more high-potential ground than Utah as a whole: 66.7% of its land against 32.8%. Of the 8 counties that border it, 2 have more high-potential ground, Morgan County the most at 99.7%.
The map rates the ground, not the air in any home.
Local help
Rich County, Local resources
Radon testing and mitigation in Rich County
- Indoor Radon ProgramIndoor Radon Program, run by Utah Department of Environmental Quality, states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Utah.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 Utah directoryNo professionals are listed in Utah yet. The state program can point you to registered testers and mitigators.
What Utah's program says
- Phone
- (801) 536-0091
- Disclosure when a home is sold or rented
Utah requires that sellers disclose "Hazardous Conditions: Are there any hazardous conditions on the Property such as Radon gas in house or well?"
What it means
Rich County, Questions
Questions about radon in Rich County
Are radon levels high in Rich County?
In 2023, 53.8% of the radon tests reported to CDC for Rich County, Utah were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.8 pCi/L. Of the counties bordering it, 4 have a figure in 2023: Morgan County reported the largest share at or above 4 pCi/L, 59.4%, and Weber County the smallest, 28.6%, with Cache County at 53.8% and Summit County at 32.6% between.
Which counties border Rich County?
Rich County borders 8 counties: Cache County, UT, Uinta County, WY, Weber County, UT, Morgan County, UT, Bear Lake County, ID, Franklin County, ID, Summit County, UT and Lincoln County, WY.
Products
Rich County, Products
Testing a home in Rich County
No CDC figure names Rich County; the nearest county with one, Cache County (27 miles away), reported 53.8% of its tests at or above 4 pCi/L in 2023, 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 Rich 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
MonitorAEGTEST
HOUND-1011S rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Rich County, Bordering counties
Counties bordering Rich County
Calculated by Radon411- Radon levels in Morgan County, UTEPA zone 2
59.4%at or above 4 pCi/L
Median 5.0 pCi/L · 207 tests
- Radon levels in Cache County, UTEPA zone 2
53.8%at or above 4 pCi/L
Median 4.4 pCi/L · 994 tests
- Radon levels in Summit County, UTEPA zone 2
32.6%at or above 4 pCi/L
Median 2.4 pCi/L · 417 tests
- Radon levels in Weber County, UTEPA zone 2
28.6%at or above 4 pCi/L
Median 2.1 pCi/L · 1,669 tests
- Radon levels in Uinta County, WYEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Bear Lake County, IDEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Franklin County, IDEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Lincoln County, WYEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
Rich County, Cities and towns
Cities and towns in Rich County
Rich County is growing: the Census Bureau puts it at 2,687 residents on July 1, 2025, up 7.4% from 2,503 in 2020. Spread over its land, that is 2.6 people to the square mile. Its largest town, Garden City, has 876 residents, 32.6% of the total. Together its 4 incorporated places hold 65.8% of those residents; the other 34.2% live outside any of them. CDC's 21 reported tests for 2022 work out to 7.8 per 1,000 residents (2025 estimate), close to Utah's 11.6.
From Garden City to Woodruff, CDC publishes no figure by town: each reads Rich County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Garden City | 876 | +41.7% | 32.6% |
| Randolph | 444 | −4.7% | 16.5% |
| Laketown | 287 | −4.3% | 10.7% |
| Woodruff | 160 | −4.2% | 6.0% |
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).
Rich County, Homes
Homes in Rich County
Of Rich County's 3,217 homes, 72% are detached houses, against 67% across Utah; 20% are mobile homes. Half of its homes were built before 1989, close to Utah's 1991: 13% date from before 1960 and 37% from 2000 or later. Owners live in 80% of the occupied homes (Utah: 71%), so for most households a test and a fix are their own to order.
| Homes | Rich County | Utah |
|---|---|---|
| Housing units | 3,217 | 1,193,082 |
| Detached houses | 72% | 67% |
| In buildings of 5 or more | 4% | 16% |
| Mobile homes | 20% | 3% |
| Built before 1960 | 13% | 16% |
| Built since 2000 | 37% | 37% |
| Middle year built | 1989 | 1991 |
| Owner-occupied | 80% | 71% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.