Bon Homme County, SD Radon Levels (74% Above 4 pCi/L)

74%tests ≥ 4 pCi/L

62tests on record

7.2median pCi/L

Zone 1EPA zone (1993 prediction)

Test results in Bon Homme County

Result	Share	EPA guidance
Below 2 pCi/L	11%	Below EPA's levels
2 to 4 pCi/L	15%	Consider fixing
4 pCi/L or more	74%	EPA recommends fixing

What the data shows

Where Bon Homme County sits among South Dakota's 62 counties with dataEach dot is a county's share of tests at or above 4 pCi/L · Radon test results from laboratories, 2008–2017

Higher share of high results than 46 of 62 South Dakota counties.
1.3× the South Dakota rate of 58%.
Highest of 4 neighbouring counties.
89% of results at or above 2 pCi/L.
21.8 tests per 1,000 homes (South Dakota: 15.6).
Median result 7.2 pCi/L: at or above the 4 pCi/L action level.

How Bon Homme County compares

Bon Homme County has the highest share of high results among its neighboursShare of tests at or above 4 pCi/L · Radon test results from laboratories, 2008–2017 · whisker: 95% range

Data table

Area	Tests ≥ 4 pCi/L	Tests
Bon Homme County	74%	62
Yankton County	73%	118
Knox County, Nebraska	69%	401
Hutchinson County	67%	39
Charles Mix County	61%	28
South Dakota (62 counties)	58%	6,275

Same source as Bon Homme County.

What it means for your home

More than half of all results in Bon Homme County were at or above 4 pCi/L, where the EPA recommends a fix. Only a test shows your own home's level.

2 EPA: consider fixing4 EPA: fixMedian here 7.2

Levels in pCi/L from the EPA. The WHO reference level is 100 Bq/m³, about 2.7 pCi/L.

Test your home

Start with a short-term test (2–90 days) and confirm a result of 4 pCi/L or more with a second test. EPA guide

Sponsored: we earn a commission on purchases through these links. We haven't tested Airthings monitors yet.

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Fixing high radon

No local job records yet. National range: $800–$2,500, average $1,200 (EPA, 2003). Cost guide →

About this data

Source: Radon test results from laboratories (CDC Environmental Public Health Tracking Network). Period: 2008–2017. Tests: 62. Read the methodology →

These are voluntary and real-estate tests, not a random sample of homes, so they describe tested homes rather than every home.

Published by Ray Roman, editor of Radon by County. Figures are loaded from the cited source and spot-checked against it. Editorial policy · About us