Out of 282 ZIP codes with data in South Dakota, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All South Dakota Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 282 |
| Lowest value | Zone 1 (High) |
| Median value | Zone 1 (High) |
| State | South Dakota |
100 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 57027 | Fairview | SD | Zone 1 (High) | 40/100 |
| 2 | 57041 | Lyons | SD | Zone 1 (High) | 40/100 |
| 3 | 57047 | Monroe | SD | Zone 1 (High) | 40/100 |
| 4 | 57052 | Olivet | SD | Zone 1 (High) | 40/100 |
| 5 | 57054 | Ramona | SD | Zone 1 (High) | 40/100 |
| 6 | 57055 | Renner | SD | Zone 1 (High) | 40/100 |
| 7 | 57057 | Rutland | SD | Zone 1 (High) | 40/100 |
| 8 | 57061 | Sinai | SD | Zone 1 (High) | 40/100 |
| 9 | 57067 | Utica | SD | Zone 1 (High) | 40/100 |
| 10 | 57218 | Brandt | SD | Zone 1 (High) | 40/100 |
| 11 | 57224 | Claire City | SD | Zone 1 (High) | 40/100 |
| 12 | 57233 | Erwin | SD | Zone 1 (High) | 40/100 |
| 13 | 57238 | Goodwin | SD | Zone 1 (High) | 40/100 |
| 14 | 57242 | Hazel | SD | Zone 1 (High) | 40/100 |
| 15 | 57245 | Kranzburg | SD | Zone 1 (High) | 40/100 |
| 16 | 57246 | Labolt | SD | Zone 1 (High) | 40/100 |
| 17 | 57251 | Marvin | SD | Zone 1 (High) | 40/100 |
| 18 | 57256 | Ortley | SD | Zone 1 (High) | 40/100 |
| 19 | 57257 | Peever | SD | Zone 1 (High) | 40/100 |
| 20 | 57258 | Raymond | SD | Zone 1 (High) | 40/100 |
| 21 | 57264 | Stockholm | SD | Zone 1 (High) | 40/100 |
| 22 | 57265 | Strandburg | SD | Zone 1 (High) | 40/100 |
| 23 | 57268 | Toronto | SD | Zone 1 (High) | 40/100 |
| 24 | 57269 | Twin Brooks | SD | Zone 1 (High) | 40/100 |
| 25 | 57312 | Alpena | SD | Zone 1 (High) | 40/100 |
| 26 | 57323 | Carthage | SD | Zone 1 (High) | 40/100 |
| 27 | 57329 | Dante | SD | Zone 1 (High) | 40/100 |
| 28 | 57331 | Dimock | SD | Zone 1 (High) | 40/100 |
| 29 | 57337 | Fedora | SD | Zone 1 (High) | 40/100 |
| 30 | 57339 | Fort Thompson | SD | Zone 1 (High) | 40/100 |
| 31 | 57340 | Fulton | SD | Zone 1 (High) | 40/100 |
| 32 | 57341 | Gann Valley | SD | Zone 1 (High) | 40/100 |
| 33 | 57342 | Geddes | SD | Zone 1 (High) | 40/100 |
| 34 | 57344 | Harrison | SD | Zone 1 (High) | 40/100 |
| 35 | 57346 | Stephan | SD | Zone 1 (High) | 40/100 |
| 36 | 57348 | Hitchcock | SD | Zone 1 (High) | 40/100 |
| 37 | 57354 | Kaylor | SD | Zone 1 (High) | 40/100 |
| 38 | 57358 | Lane | SD | Zone 1 (High) | 40/100 |
| 39 | 57364 | New Holland | SD | Zone 1 (High) | 40/100 |
| 40 | 57371 | Ree Heights | SD | Zone 1 (High) | 40/100 |
| 41 | 57379 | Virgil | SD | Zone 1 (High) | 40/100 |
| 42 | 57386 | Yale | SD | Zone 1 (High) | 40/100 |
| 43 | 57420 | Akaska | SD | Zone 1 (High) | 40/100 |
| 44 | 57422 | Andover | SD | Zone 1 (High) | 40/100 |
| 45 | 57426 | Barnard | SD | Zone 1 (High) | 40/100 |
| 46 | 57455 | Lebanon | SD | Zone 1 (High) | 40/100 |
| 47 | 57457 | Long Lake | SD | Zone 1 (High) | 40/100 |
| 48 | 57460 | Mansfield | SD | Zone 1 (High) | 40/100 |
| 49 | 57466 | Onaka | SD | Zone 1 (High) | 40/100 |
| 50 | 57467 | Orient | SD | Zone 1 (High) | 40/100 |
| 51 | 57470 | Rockham | SD | Zone 1 (High) | 40/100 |
| 52 | 57520 | Agar | SD | Zone 1 (High) | 40/100 |
| 53 | 57534 | Hamill | SD | Zone 1 (High) | 40/100 |
| 54 | 57536 | Harrold | SD | Zone 1 (High) | 40/100 |
| 55 | 57540 | Holabird | SD | Zone 1 (High) | 40/100 |
| 56 | 57548 | Lower Brule | SD | Zone 1 (High) | 40/100 |
| 57 | 57569 | Reliance | SD | Zone 1 (High) | 40/100 |
| 58 | 57576 | Vivian | SD | Zone 1 (High) | 40/100 |
| 59 | 57634 | Keldron | SD | Zone 1 (High) | 40/100 |
| 60 | 57640 | Lodgepole | SD | Zone 1 (High) | 40/100 |
| 61 | 57642 | Mc Laughlin | SD | Zone 1 (High) | 40/100 |
| 62 | 57644 | Meadow | SD | Zone 1 (High) | 40/100 |
| 63 | 57649 | Prairie City | SD | Zone 1 (High) | 40/100 |
| 64 | 57659 | Walker | SD | Zone 1 (High) | 40/100 |
| 65 | 57660 | Watauga | SD | Zone 1 (High) | 40/100 |
| 66 | 57322 | Carpenter | SD | Zone 1 (High) | 44/100 |
| 67 | 57016 | Chester | SD | Zone 1 (High) | 45/100 |
| 68 | 57021 | Davis | SD | Zone 1 (High) | 45/100 |
| 69 | 57058 | Salem | SD | Zone 1 (High) | 45/100 |
| 70 | 57075 | Wentworth | SD | Zone 1 (High) | 45/100 |
| 71 | 57220 | Bruce | SD | Zone 1 (High) | 45/100 |
| 72 | 57369 | Platte | SD | Zone 1 (High) | 45/100 |
| 73 | 57424 | Ashton | SD | Zone 1 (High) | 45/100 |
| 74 | 57522 | Blunt | SD | Zone 1 (High) | 45/100 |
| 75 | 57263 | South Shore | SD | Zone 1 (High) | 48/100 |
| 76 | 57006 | Brookings | SD | Zone 1 (High) | 49/100 |
| 77 | 57401 | Aberdeen | SD | Zone 1 (High) | 49/100 |
| 78 | 57007 | Brookings | SD | Zone 1 (High) | 52/100 |
| 79 | 57010 | Burbank | SD | Zone 1 (High) | 53/100 |
| 80 | 57050 | Nunda | SD | Zone 1 (High) | 53/100 |
| 81 | 57051 | Oldham | SD | Zone 1 (High) | 53/100 |
| 82 | 57076 | Winfred | SD | Zone 1 (High) | 53/100 |
| 83 | 57217 | Bradley | SD | Zone 1 (High) | 53/100 |
| 84 | 57247 | Lake City | SD | Zone 1 (High) | 53/100 |
| 85 | 57259 | Revillo | SD | Zone 1 (High) | 53/100 |
| 86 | 57271 | Vienna | SD | Zone 1 (High) | 53/100 |
| 87 | 57361 | Marty | SD | Zone 1 (High) | 53/100 |
| 88 | 57370 | Pukwana | SD | Zone 1 (High) | 53/100 |
| 89 | 57373 | Saint Lawrence | SD | Zone 1 (High) | 53/100 |
| 90 | 57421 | Amherst | SD | Zone 1 (High) | 53/100 |
| 91 | 57432 | Claremont | SD | Zone 1 (High) | 53/100 |
| 92 | 57433 | Columbia | SD | Zone 1 (High) | 53/100 |
| 93 | 57436 | Doland | SD | Zone 1 (High) | 53/100 |
| 94 | 57439 | Ferney | SD | Zone 1 (High) | 53/100 |
| 95 | 57449 | Houghton | SD | Zone 1 (High) | 53/100 |
| 96 | 57461 | Mellette | SD | Zone 1 (High) | 53/100 |
| 97 | 57476 | Tulare | SD | Zone 1 (High) | 53/100 |
| 98 | 57477 | Turton | SD | Zone 1 (High) | 53/100 |
| 99 | 57544 | Kennebec | SD | Zone 1 (High) | 53/100 |
| 100 | 57646 | Mound City | SD | Zone 1 (High) | 53/100 |
Methodology
Radon rankings are based on EPA county-level radon zone classifications. Zone 1 (highest risk) has predicted average indoor radon levels above 4 pCi/L — the EPA action level. Zone 2 is moderate (2-4 pCi/L) and Zone 3 is low (below 2 pCi/L). Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to prioritize areas with compounding risk factors.
Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.
Frequently Asked Questions
What is EPA Radon Zone 1?
Zone 1 is the EPA highest-risk classification, meaning the county has predicted average indoor radon levels above 4 pCi/L — the level at which the EPA recommends mitigation. Radon causes about 21,000 lung cancer deaths per year in the U.S.
Should I test for radon?
The EPA recommends testing all homes regardless of radon zone. A DIY test kit costs $15-40. Professional testing costs $150-250. If levels exceed 4 pCi/L, mitigation systems ($800-2,500) can reduce radon by up to 99%.
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