Neighborhood Report
Grade C
Longmont, CO Neighborhood Water Quality — Grade C
4 ZIP codes · 12 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Longmont, CO. We analyzed 4 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade C (62/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 0 | 0% |
| C | 4 | 100% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Longmont ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 80502 | 65 | C | 3 | 0.0016 mg/L |
| 2 | 80504 | 64 | C | 3 | 0.0016 mg/L |
| 3 | 80501 | 59 | C | 3 | 0.0016 mg/L |
| 4 | 80503 | 59 | C | 3 | 0.0016 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 2 neighborhoods score better than county average
- 2 neighborhoods score worse than county average
EPA Violations
- 12 total violations across Longmont
- 0 health-based violations
- 4 of 4 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Total Trihalomethanes (TTHM) | 4 | 4 |
| Haloacetic Acids (HAA5) | 4 | 4 |
| Stage 2 DBP Rule | 4 | 4 |
Frequently Asked Questions
What is the safest neighborhood in Longmont?
ZIP code 80502 has the highest safety score in Longmont at 65/100 (grade C). Check the full report for details.
Is Longmont water safe to drink?
Longmont has an average water safety score of 62/100 (C). 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.