Neighborhood Report
Grade B
Walnut, CA Neighborhood Water Quality — Clean Compliance
3 ZIP codes · 0 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-03
Water quality varies significantly across Walnut, CA. We analyzed 3 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade B (83/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 3 | 100% |
| C | 0 | 0% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Walnut ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 91788 | 83 | B | 0 | 0.0027 mg/L |
| 2 | 91789 | 83 | B | 0 | 0.0027 mg/L |
| 3 | 91795 | 83 | B | 0 | 0.0027 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 3 neighborhoods score better than county average
- 0 neighborhoods score worse than county average
Frequently Asked Questions
What is the safest neighborhood in Walnut?
ZIP code 91788 has the highest safety score in Walnut at 83/100 (grade B). Check the full report for details.
Is Walnut water safe to drink?
Walnut 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.