Neighborhood Report
Grade C
Columbia, MD Neighborhood Water Quality — Grade C
3 ZIP codes · 18 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Columbia, MD. We analyzed 3 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 | 3 | 100% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Columbia ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 21044 | 62 | C | 6 | 0.0030 mg/L |
| 2 | 21045 | 62 | C | 6 | 0.0030 mg/L |
| 3 | 21046 | 62 | C | 6 | 0.0030 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
EPA Violations
- 18 total violations across Columbia
- 0 health-based violations
- 3 of 3 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Stage 1 DBP Rule | 6 | 3 |
| Surface Water Treatment Rule | 6 | 3 |
| Consumer Confidence Report Rule | 6 | 3 |
Frequently Asked Questions
What is the safest neighborhood in Columbia?
ZIP code 21044 has the highest safety score in Columbia at 62/100 (grade C). Check the full report for details.
Is Columbia water safe to drink?
Columbia 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.