Neighborhood Report
Grade B
San Marcos, TX Neighborhood Water Quality — Grade B
2 ZIP codes · 2 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across San Marcos, TX. We analyzed 2 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade B (83/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 1 | 50% |
| B | 1 | 50% |
| C | 0 | 0% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in San Marcos ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 78667 | 85 | A | 1 | 0.0016 mg/L |
| 2 | 78666 | 80 | B | 1 | 0.0016 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
- 2 total violations across San Marcos
- 0 health-based violations
- 2 of 2 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Contaminant 1009 | 2 | 2 |
Frequently Asked Questions
What is the safest neighborhood in San Marcos?
ZIP code 78667 has the highest safety score in San Marcos at 85/100 (grade A). Check the full report for details.
Is San Marcos water safe to drink?
San Marcos has an average water safety score of 83/100 (B). 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.