South Carolina — 1st District
119th Congress · 53 ZIP codes · Avg score 82/100 · Grade B · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
53 ZIP codes tracked in South Carolina's 1st District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 29409 | Charleston | 99 | A | 0 |
| 2 | 29413 | Charleston | 99 | A | 0 |
| 3 | 29416 | Charleston | 99 | A | 0 |
| 4 | 29423 | Charleston | 99 | A | 0 |
| 5 | 29424 | Charleston | 99 | A | 0 |
| 6 | 29903 | Beaufort | 98 | A | 2 |
| 7 | 29904 | Beaufort | 98 | A | 2 |
| 8 | 29457 | Johns Island | 96 | A | 6 |
| 9 | 29417 | Charleston | 95 | A | 0 |
| 10 | 29422 | Charleston | 95 | A | 0 |
| 11 | 29425 | Charleston | 95 | A | 0 |
| 12 | 29931 | Lobeco | 95 | A | 0 |
| 13 | 29465 | Mount Pleasant | 94 | A | 8 (1 health) |
| 14 | 29901 | Beaufort | 94 | A | 2 |
| 15 | 29905 | Beaufort | 94 | A | 2 |
| 16 | 29402 | Charleston | 90 | A | 0 |
| 17 | 29426 | Adams Run | 90 | A | 0 |
| 18 | 29492 | Charleston | 90 | A | 0 |
| 19 | 29925 | Hilton Head Island | 90 | A | 0 |
| 20 | 29938 | Hilton Head Island | 90 | A | 0 |
| 21 | 29915 | Daufuskie Island | 89 | A | 2 (1 health) |
| 22 | 29470 | Ravenel | 88 | A | 7 (2 health) |
| 23 | 29406 | Charleston | 85 | A | 0 |
| 24 | 29429 | Awendaw | 84 | B | 3 (1 health) |
| 25 | 29906 | Beaufort | 84 | B | 2 |
| 26 | 29940 | Seabrook | 82 | B | 6 |
| 27 | 29403 | Charleston | 80 | B | 0 |
| 28 | 29482 | Sullivans Island | 80 | B | 0 |
| 29 | 29466 | Mount Pleasant | 79 | B | 8 (1 health) |
| 30 | 29902 | Beaufort | 79 | B | 2 |
| 31 | 29909 | Okatie | 78 | B | 4 (4 health) |
| 32 | 29401 | Charleston | 75 | B | 0 |
| 33 | 29407 | Charleston | 75 | B | 0 |
| 34 | 29412 | Charleston | 75 | B | 0 |
| 35 | 29414 | Charleston | 75 | B | 0 |
| 36 | 29439 | Folly Beach | 75 | B | 0 |
| 37 | 29451 | Isle Of Palms | 75 | B | 0 |
| 38 | 29926 | Hilton Head Island | 75 | B | 0 |
| 39 | 29928 | Hilton Head Island | 75 | B | 0 |
| 40 | 29464 | Mount Pleasant | 74 | B | 8 (1 health) |
| 41 | 29446 | Green Pond | 73 | B | 0 |
| 42 | 29452 | Jacksonboro | 73 | B | 0 |
| 43 | 29914 | Dale | 73 | B | 0 |
| 44 | 29935 | Port Royal | 73 | B | 0 |
| 45 | 29455 | Johns Island | 72 | B | 6 |
| 46 | 29910 | Bluffton | 68 | C | 4 |
| 47 | 29450 | Huger | 65 | C | 0 |
| 48 | 29487 | Wadmalaw Island | 65 | C | 0 |
| 49 | 29941 | Sheldon | 65 | C | 0 |
| 50 | 29449 | Hollywood | 60 | C | 0 |
Overview
South Carolina's 1st District serving an estimated 6,612,489 residents encompasses 53 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (82/100).
74 EPA violations have been recorded across this district's water systems. 11 are health-based violations. About 32% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Surface Water Treatment Rule — 25 violations
- Stage 2 DBP Rule — 14 violations
- Stage 1 DBP Rule — 13 violations
- Consumer Confidence Report Rule — 6 violations
- Revised Total Coliform Rule — 6 violations
Housing Context
Homes in this district were built on average around 1985 (~41 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 53 ZIP codes in South Carolina's 1st District.