Out of 30 ZIP codes with data in South Carolina, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes in EPA Radon Zone 1 | All South Carolina Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 30 |
| Lowest value | Zone 1 (highest potential) |
| Median value | Zone 1 (highest potential) |
| State | South Carolina |
30 Lowest-Ranked ZIP Codes
| Rank | ZIP Code | City | State | Radon Zone | Safety Score |
|---|---|---|---|---|---|
| 1 | 29680 | Simpsonville | SC | Zone 1 (highest potential) | 48/100 |
| 2 | 29644 | Fountain Inn | SC | Zone 1 (highest potential) | 49/100 |
| 3 | 29681 | Simpsonville | SC | Zone 1 (highest potential) | 49/100 |
| 4 | 29601 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 5 | 29605 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 6 | 29607 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 7 | 29609 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 8 | 29611 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 9 | 29613 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 10 | 29614 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 11 | 29615 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 12 | 29617 | Greenville | SC | Zone 1 (highest potential) | 65/100 |
| 13 | 29635 | Cleveland | SC | Zone 1 (highest potential) | 65/100 |
| 14 | 29650 | Greer | SC | Zone 1 (highest potential) | 65/100 |
| 15 | 29651 | Greer | SC | Zone 1 (highest potential) | 65/100 |
| 16 | 29661 | Marietta | SC | Zone 1 (highest potential) | 65/100 |
| 17 | 29662 | Mauldin | SC | Zone 1 (highest potential) | 65/100 |
| 18 | 29687 | Taylors | SC | Zone 1 (highest potential) | 65/100 |
| 19 | 29690 | Travelers Rest | SC | Zone 1 (highest potential) | 65/100 |
| 20 | 29356 | Landrum | SC | Zone 1 (highest potential) | 66/100 |
| 21 | 29322 | Campobello | SC | Zone 1 (highest potential) | 83/100 |
| 22 | 29603 | Greenville | SC | Zone 1 (highest potential) | — |
| 23 | 29606 | Greenville | SC | Zone 1 (highest potential) | — |
| 24 | 29608 | Greenville | SC | Zone 1 (highest potential) | — |
| 25 | 29610 | Greenville | SC | Zone 1 (highest potential) | — |
| 26 | 29612 | Greenville | SC | Zone 1 (highest potential) | — |
| 27 | 29616 | Greenville | SC | Zone 1 (highest potential) | — |
| 28 | 29636 | Conestee | SC | Zone 1 (highest potential) | — |
| 29 | 29652 | Greer | SC | Zone 1 (highest potential) | — |
| 30 | 29683 | Slater | SC | 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%.
Explore More Rankings
- Worst ZIP Codes for Lead in Water in South Carolina
- ZIP Codes with Most EPA Violations in South Carolina
- Lowest Home Safety Scores in South Carolina
- Highest Home Safety Scores in South Carolina
- Historical NFIP Claim Counts in South Carolina
- ZIP Codes with Highest Energy Costs in South Carolina
- ZIP Codes with PFAS Detections in South Carolina
- Least Reliable Water Systems in South Carolina
- Environmental Justice Concern Areas in South Carolina
- Worst ZIP Codes for Homebuyers in South Carolina
- ZIP Codes with Worst CO & Gas Risk in South Carolina
- Safest ZIP Codes for Gas & CO Risk in South Carolina
- ZIP Codes with Worst Wildfire Smoke Risk in South Carolina
- Safest ZIP Codes for Wildfire Smoke in South Carolina
- All Rankings