South Dakota Radon Map, Levels & Testing Guide
Browse the 65 listed county pages surfaced for South Dakota. Open a listed county to compare its EPA zone, source caveats, testing meaning, and when mitigation pricing becomes worth checking.
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Official Evidence in South Dakota
65 of 65 listed counties have official evidence
Open a county page to see the official source context: measurement fields, local burden, state percentile, and the next step for no reading, 2.0-3.9, or 4.0+ pCi/L.
100%
covered
Measured
65
State source
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CDC source
65
Needs source detail
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Measured Risk Leaders in South Dakota
County rankings from actual reported radon tests
These lists rank the visible South Dakota county pages by measured radon signals, not by the EPA zone label alone. Use them to spot where the state hub has a real data story before opening individual county pages.
65
measured counties
State-level evidence read
This hub has measured high-burden counties, so the first click should be evidence-led.
The state hub is now doing a decision job: it separates first-click counties, retest counties, and lower-signal counties from 65 visible county measurement rows. 57 counties cross the high measured-burden band, so those pages should answer testing and 4.0+ action questions most directly.
First-click counties
Open Faulk County first when you need the strongest local answer. It is tagged Test-now from 100.0% 4.0+ - 32.2 pCi/L primary - 1 tests. 58 visible measured counties are elevated or high enough to review before lower-signal counties.
Buyer/seller lane
Buyer/seller lane: start with the elevated or high counties, require a fresh lowest-level test, and turn any 4.0+ property result into quote or credit math. The hub has 65 CDC-backed county rows to support that routing.
Retest lane
Retest lane: 2.0-3.9 pCi/L deserves more caution in the elevated/high county set than in lower-signal counties. The hub should send those users to county pages before product or cost paths.
Best county pages to open first
Start with these local evidence pages
Ranked by measured burden, 4.0+ share, test volume, and whether the EPA zone understates the measurement signal.
Faulk County
CDC Tracking
100.0% 4.0+ - 32.2 pCi/L primary - 1 tests
Faulk County is a first-click page: 100.0% of reported tests at or above 4.0 and 32.2 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Miner County
CDC Tracking
50.0% 4.0+ - 34.4 pCi/L primary - 4 tests
Miner County is a first-click page: 50.0% of reported tests at or above 4.0 and 34.4 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Custer County
CDC Tracking
65.7% 4.0+ - 30.1 pCi/L primary - 59 tests
Custer County is a first-click page: 65.7% of reported tests at or above 4.0 and 30.1 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Lawrence County
CDC Tracking
56.9% 4.0+ - 29.0 pCi/L primary - 119 tests
Lawrence County is a first-click page: 56.9% of reported tests at or above 4.0 and 29.0 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Highest 4.0+ share
Primary result 32.2 pCi/L - high-end 32.2 pCi/L
CDC Tracking
Primary result 5.1 pCi/L - high-end 5.1 pCi/L
CDC Tracking
Primary result 22.1 pCi/L - high-end 31.7 pCi/L
CDC Tracking
Primary result 4.1 pCi/L - high-end 4.1 pCi/L
CDC Tracking
Primary result 4.7 pCi/L - high-end 4.7 pCi/L
CDC Tracking
Highest high-end reading
4.0+ share 56.9% - primary result 29.0 pCi/L
CDC Tracking
4.0+ share 65.7% - primary result 30.1 pCi/L
CDC Tracking
4.0+ share 53.6% - primary result 10.0 pCi/L
CDC Tracking
4.0+ share 58.5% - primary result 6.5 pCi/L
CDC Tracking
4.0+ share 51.1% - primary result 6.9 pCi/L
CDC Tracking
Most reported tests
4.0+ share 58.5% - primary result 6.5 pCi/L
CDC Tracking
4.0+ share 56.5% - primary result 6.5 pCi/L
CDC Tracking
4.0+ share 53.6% - primary result 10.0 pCi/L
CDC Tracking
4.0+ share 68.5% - primary result 8.6 pCi/L
CDC Tracking
4.0+ share 51.1% - primary result 6.9 pCi/L
CDC Tracking
Measured pattern
Among 65 visible counties with measurement tables, 57 land in the high measured-burden band and 58 land in high or elevated measured-burden bands. That lets this hub rank counties by observed test distribution instead of repeating the EPA map.
Map vs measurements
14 elevated measured counties are not EPA Zone 1. Those are the pages where the actual test distribution matters more than a map-only answer.
Source strategy
The measured rows shown here use CDC Tracking. This is still official evidence, but the hub should keep source caveats visible until a stable state table is available.
Already Tested
View South Dakota Cost Estimates
If you already have a radon result, skip the directory and move straight to local price guidance.
Understand the Number
2.0 vs 4.0 vs 8.0 pCi/L
Use the parent levels guide if you need the plain-English meaning of a radon result before browsing counties.
Need a Number First
Read the Testing Guide
Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Official State Resource
South Dakota radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure rule tracked
South Dakota requires sellers to disclose known property conditions through a Property Condition Disclosure Statement.
Credential note
South Dakota does not require specific radon licensing.
Already tested? Get your itemized mitigation cost estimate.
View South Dakota Mitigation Cost Estimates ->