Out of 33 ZIP codes with data in Rhode Island, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Rhode Island Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 33 |
| Lowest value | Zone 1 (High) |
| Median value | Zone 1 (High) |
| State | Rhode Island |
33 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 02874 | Saunderstown | RI | Zone 1 (High) | 33/100 |
| 2 | 02879 | Wakefield | RI | Zone 1 (High) | 33/100 |
| 3 | 02881 | Kingston | RI | Zone 1 (High) | 33/100 |
| 4 | 02892 | West Kingston | RI | Zone 1 (High) | 33/100 |
| 5 | 02816 | Coventry | RI | Zone 1 (High) | 40/100 |
| 6 | 02808 | Bradford | RI | Zone 1 (High) | 41/100 |
| 7 | 02891 | Westerly | RI | Zone 1 (High) | 41/100 |
| 8 | 02882 | Narragansett | RI | Zone 1 (High) | 42/100 |
| 9 | 02818 | East Greenwich | RI | Zone 1 (High) | 48/100 |
| 10 | 02886 | Warwick | RI | Zone 1 (High) | 49/100 |
| 11 | 02817 | West Greenwich | RI | Zone 1 (High) | 50/100 |
| 12 | 02852 | North Kingstown | RI | Zone 1 (High) | 50/100 |
| 13 | 02893 | West Warwick | RI | Zone 1 (High) | 50/100 |
| 14 | 02807 | Block Island | RI | Zone 1 (High) | 63/100 |
| 15 | 02831 | Hope | RI | Zone 1 (High) | 66/100 |
| 16 | 02888 | Warwick | RI | Zone 1 (High) | 66/100 |
| 17 | 02889 | Warwick | RI | Zone 1 (High) | 66/100 |
| 18 | 02804 | Ashaway | RI | Zone 1 (High) | — |
| 19 | 02812 | Carolina | RI | Zone 1 (High) | — |
| 20 | 02813 | Charlestown | RI | Zone 1 (High) | — |
| 21 | 02822 | Exeter | RI | Zone 1 (High) | — |
| 22 | 02823 | Fiskeville | RI | Zone 1 (High) | — |
| 23 | 02832 | Hope Valley | RI | Zone 1 (High) | — |
| 24 | 02833 | Hopkinton | RI | Zone 1 (High) | — |
| 25 | 02836 | Kenyon | RI | Zone 1 (High) | — |
| 26 | 02873 | Rockville | RI | Zone 1 (High) | — |
| 27 | 02875 | Shannock | RI | Zone 1 (High) | — |
| 28 | 02877 | Slocum | RI | Zone 1 (High) | — |
| 29 | 02880 | Wakefield | RI | Zone 1 (High) | — |
| 30 | 02883 | Peace Dale | RI | Zone 1 (High) | — |
| 31 | 02887 | Warwick | RI | Zone 1 (High) | — |
| 32 | 02894 | Wood River Junction | RI | Zone 1 (High) | — |
| 33 | 02898 | Wyoming | RI | Zone 1 (High) | — |
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: 2026-08-14.
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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