Neighborhood Report
Grade C
Great Falls, MT Neighborhood Water Quality — Grade C
5 ZIP codes · 65 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Great Falls, MT. We analyzed 5 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade C (56/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 0 | 0% |
| C | 3 | 60% |
| D | 2 | 40% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Great Falls ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 59406 | 61 | C | 13 | 0.0080 mg/L |
| 2 | 59401 | 56 | C | 13 | 0.0080 mg/L |
| 3 | 59405 | 56 | C | 13 | 0.0080 mg/L |
| 4 | 59403 | 54 | D | 13 | 0.0080 mg/L |
| 5 | 59404 | 51 | D | 13 | 0.0080 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 1 neighborhoods score better than county average
- 4 neighborhoods score worse than county average
EPA Violations
- 65 total violations across Great Falls
- 10 health-based violations
- 5 of 5 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Consumer Confidence Report Rule | 25 | 5 |
| Surface Water Treatment Rule | 20 | 5 |
| Total Trihalomethanes (TTHM) | 5 | 5 |
| Total Coliform | 5 | 5 |
| Stage 1 DBP Rule | 5 | 5 |
Frequently Asked Questions
What is the safest neighborhood in Great Falls?
ZIP code 59406 has the highest safety score in Great Falls at 61/100 (grade C). Check the full report for details.
Is Great Falls water safe to drink?
Great Falls has an average water safety score of 56/100 (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.