Neighborhood Report
Grade A
Johns Island, SC Neighborhood Water Quality — Grade A
2 ZIP codes · 6 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Johns Island, SC. We analyzed 2 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade A (86/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 1 | 50% |
| B | 1 | 50% |
| C | 0 | 0% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Johns Island ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 29457 | 98 | A | 3 | 0.0020 mg/L |
| 2 | 29455 | 74 | B | 3 | 0.0020 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 1 neighborhoods score better than county average
- 1 neighborhoods score worse than county average
EPA Violations
- 6 total violations across Johns Island
- 0 health-based violations
- 2 of 2 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Consumer Confidence Report Rule | 2 | 2 |
| Revised Total Coliform Rule | 2 | 2 |
| E. coli | 2 | 2 |
Frequently Asked Questions
What is the safest neighborhood in Johns Island?
ZIP code 29457 has the highest safety score in Johns Island at 98/100 (grade A). Check the full report for details.
Is Johns Island water safe to drink?
Johns Island has an average water safety score of 86/100 (A). Water quality varies by neighborhood — no ZIP codes currently exceed EPA lead limits. Always check your specific ZIP code.
Related Pages
Data Sources
- EPA SDWIS
- U.S. Census Bureau
Updated daily.