Out of 282 ZIP codes with data in South Dakota, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes in EPA Radon Zone 1 | All South Dakota Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 282 |
| Lowest value | Zone 1 (highest potential) |
| Median value | Zone 1 (highest potential) |
| State | South Dakota |
100 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 57401 | Aberdeen | SD | Zone 1 (highest potential) | 55/100 |
| 2 | 57110 | Sioux Falls | SD | Zone 1 (highest potential) | 62/100 |
| 3 | 57005 | Brandon | SD | Zone 1 (highest potential) | 65/100 |
| 4 | 57201 | Watertown | SD | Zone 1 (highest potential) | 65/100 |
| 5 | 57263 | South Shore | SD | Zone 1 (highest potential) | 65/100 |
| 6 | 57022 | Dell Rapids | SD | Zone 1 (highest potential) | 66/100 |
| 7 | 57026 | Elkton | SD | Zone 1 (highest potential) | 66/100 |
| 8 | 57068 | Valley Springs | SD | Zone 1 (highest potential) | 66/100 |
| 9 | 57106 | Sioux Falls | SD | Zone 1 (highest potential) | 66/100 |
| 10 | 57002 | Aurora | SD | Zone 1 (highest potential) | 67/100 |
| 11 | 57003 | Baltic | SD | Zone 1 (highest potential) | 67/100 |
| 12 | 57010 | Burbank | SD | Zone 1 (highest potential) | 67/100 |
| 13 | 57018 | Colton | SD | Zone 1 (highest potential) | 67/100 |
| 14 | 57020 | Crooks | SD | Zone 1 (highest potential) | 67/100 |
| 15 | 57033 | Hartford | SD | Zone 1 (highest potential) | 67/100 |
| 16 | 57035 | Humboldt | SD | Zone 1 (highest potential) | 67/100 |
| 17 | 57041 | Lyons | SD | Zone 1 (highest potential) | 67/100 |
| 18 | 57055 | Renner | SD | Zone 1 (highest potential) | 67/100 |
| 19 | 57069 | Vermillion | SD | Zone 1 (highest potential) | 67/100 |
| 20 | 57073 | Wakonda | SD | Zone 1 (highest potential) | 67/100 |
| 21 | 57104 | Sioux Falls | SD | Zone 1 (highest potential) | 67/100 |
| 22 | 57105 | Sioux Falls | SD | Zone 1 (highest potential) | 67/100 |
| 23 | 57107 | Sioux Falls | SD | Zone 1 (highest potential) | 67/100 |
| 24 | 57117 | Sioux Falls | SD | Zone 1 (highest potential) | 67/100 |
| 25 | 57220 | Bruce | SD | Zone 1 (highest potential) | 67/100 |
| 26 | 57276 | White | SD | Zone 1 (highest potential) | 67/100 |
| 27 | 57427 | Bath | SD | Zone 1 (highest potential) | 67/100 |
| 28 | 57433 | Columbia | SD | Zone 1 (highest potential) | 67/100 |
| 29 | 57434 | Conde | SD | Zone 1 (highest potential) | 67/100 |
| 30 | 57441 | Frederick | SD | Zone 1 (highest potential) | 67/100 |
| 31 | 57445 | Groton | SD | Zone 1 (highest potential) | 67/100 |
| 32 | 57446 | Hecla | SD | Zone 1 (highest potential) | 67/100 |
| 33 | 57449 | Houghton | SD | Zone 1 (highest potential) | 67/100 |
| 34 | 57460 | Mansfield | SD | Zone 1 (highest potential) | 67/100 |
| 35 | 57474 | Stratford | SD | Zone 1 (highest potential) | 67/100 |
| 36 | 57479 | Warner | SD | Zone 1 (highest potential) | 67/100 |
| 37 | 57481 | Westport | SD | Zone 1 (highest potential) | 67/100 |
| 38 | 57501 | Pierre | SD | Zone 1 (highest potential) | 67/100 |
| 39 | 57522 | Blunt | SD | Zone 1 (highest potential) | 67/100 |
| 40 | 57536 | Harrold | SD | Zone 1 (highest potential) | 67/100 |
| 41 | 57001 | Alcester | SD | Zone 1 (highest potential) | — |
| 42 | 57004 | Beresford | SD | Zone 1 (highest potential) | — |
| 43 | 57006 | Brookings | SD | Zone 1 (highest potential) | — |
| 44 | 57007 | Brookings | SD | Zone 1 (highest potential) | — |
| 45 | 57012 | Canistota | SD | Zone 1 (highest potential) | — |
| 46 | 57013 | Canton | SD | Zone 1 (highest potential) | — |
| 47 | 57014 | Centerville | SD | Zone 1 (highest potential) | — |
| 48 | 57015 | Chancellor | SD | Zone 1 (highest potential) | — |
| 49 | 57016 | Chester | SD | Zone 1 (highest potential) | — |
| 50 | 57017 | Colman | SD | Zone 1 (highest potential) | — |
| 51 | 57021 | Davis | SD | Zone 1 (highest potential) | — |
| 52 | 57024 | Egan | SD | Zone 1 (highest potential) | — |
| 53 | 57025 | Elk Point | SD | Zone 1 (highest potential) | — |
| 54 | 57027 | Fairview | SD | Zone 1 (highest potential) | — |
| 55 | 57028 | Flandreau | SD | Zone 1 (highest potential) | — |
| 56 | 57029 | Freeman | SD | Zone 1 (highest potential) | — |
| 57 | 57030 | Garretson | SD | Zone 1 (highest potential) | — |
| 58 | 57031 | Gayville | SD | Zone 1 (highest potential) | — |
| 59 | 57032 | Harrisburg | SD | Zone 1 (highest potential) | — |
| 60 | 57034 | Hudson | SD | Zone 1 (highest potential) | — |
| 61 | 57036 | Hurley | SD | Zone 1 (highest potential) | — |
| 62 | 57037 | Irene | SD | Zone 1 (highest potential) | — |
| 63 | 57038 | Jefferson | SD | Zone 1 (highest potential) | — |
| 64 | 57039 | Lennox | SD | Zone 1 (highest potential) | — |
| 65 | 57040 | Lesterville | SD | Zone 1 (highest potential) | — |
| 66 | 57042 | Madison | SD | Zone 1 (highest potential) | — |
| 67 | 57043 | Marion | SD | Zone 1 (highest potential) | — |
| 68 | 57045 | Menno | SD | Zone 1 (highest potential) | — |
| 69 | 57046 | Mission Hill | SD | Zone 1 (highest potential) | — |
| 70 | 57047 | Monroe | SD | Zone 1 (highest potential) | — |
| 71 | 57048 | Montrose | SD | Zone 1 (highest potential) | — |
| 72 | 57049 | North Sioux City | SD | Zone 1 (highest potential) | — |
| 73 | 57050 | Nunda | SD | Zone 1 (highest potential) | — |
| 74 | 57051 | Oldham | SD | Zone 1 (highest potential) | — |
| 75 | 57052 | Olivet | SD | Zone 1 (highest potential) | — |
| 76 | 57053 | Parker | SD | Zone 1 (highest potential) | — |
| 77 | 57054 | Ramona | SD | Zone 1 (highest potential) | — |
| 78 | 57056 | Brandon | SD | Zone 1 (highest potential) | — |
| 79 | 57057 | Rutland | SD | Zone 1 (highest potential) | — |
| 80 | 57058 | Salem | SD | Zone 1 (highest potential) | — |
| 81 | 57059 | Scotland | SD | Zone 1 (highest potential) | — |
| 82 | 57061 | Sinai | SD | Zone 1 (highest potential) | — |
| 83 | 57062 | Springfield | SD | Zone 1 (highest potential) | — |
| 84 | 57063 | Tabor | SD | Zone 1 (highest potential) | — |
| 85 | 57064 | Tea | SD | Zone 1 (highest potential) | — |
| 86 | 57065 | Trent | SD | Zone 1 (highest potential) | — |
| 87 | 57066 | Tyndall | SD | Zone 1 (highest potential) | — |
| 88 | 57067 | Utica | SD | Zone 1 (highest potential) | — |
| 89 | 57070 | Viborg | SD | Zone 1 (highest potential) | — |
| 90 | 57071 | Volga | SD | Zone 1 (highest potential) | — |
| 91 | 57072 | Volin | SD | Zone 1 (highest potential) | — |
| 92 | 57075 | Wentworth | SD | Zone 1 (highest potential) | — |
| 93 | 57076 | Winfred | SD | Zone 1 (highest potential) | — |
| 94 | 57077 | Worthing | SD | Zone 1 (highest potential) | — |
| 95 | 57078 | Yankton | SD | Zone 1 (highest potential) | — |
| 96 | 57101 | Sioux Falls | SD | Zone 1 (highest potential) | — |
| 97 | 57103 | Sioux Falls | SD | Zone 1 (highest potential) | — |
| 98 | 57108 | Sioux Falls | SD | Zone 1 (highest potential) | — |
| 99 | 57109 | Sioux Falls | SD | Zone 1 (highest potential) | — |
| 100 | 57118 | Sioux Falls | SD | Zone 1 (highest potential) | — |
Methodology
This ranking is limited to EPA county-level radon zone classification. Zone 1 identifies the highest county-level potential category; it does not measure a home or establish whether any building is above an action level. Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to organize area context.
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: 2026-08-31.
Frequently Asked Questions
What is EPA Radon Zone 1?
Zone 1 is the EPA highest county-level radon-potential category. It is not a measurement for a home and cannot determine whether a building is above an action level. A home test is required for that decision.
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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