Neighborhood Report
Grade B
Rancho Cucamonga, CA Neighborhood Water Quality — Grade B
5 ZIP codes · 15 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Rancho Cucamonga, CA. We analyzed 5 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade B (80/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 5 | 100% |
| C | 0 | 0% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Rancho Cucamonga ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 91729 | 82 | B | 3 | 0.0020 mg/L |
| 2 | 91737 | 82 | B | 3 | 0.0020 mg/L |
| 3 | 91739 | 82 | B | 3 | 0.0020 mg/L |
| 4 | 91701 | 77 | B | 3 | 0.0020 mg/L |
| 5 | 91730 | 77 | B | 3 | 0.0020 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 5 neighborhoods score better than county average
- 0 neighborhoods score worse than county average
EPA Violations
- 15 total violations across Rancho Cucamonga
- 0 health-based violations
- 5 of 5 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Lead | 5 | 5 |
| Stage 1 DBP Rule | 5 | 5 |
| Consumer Confidence Report Rule | 5 | 5 |
Frequently Asked Questions
What is the safest neighborhood in Rancho Cucamonga?
ZIP code 91729 has the highest safety score in Rancho Cucamonga at 82/100 (grade B). Check the full report for details.
Is Rancho Cucamonga water safe to drink?
Rancho Cucamonga has an average water safety score of 80/100 (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.