Fort Belknap Agency Water System
PWSID: 083090041
This system has no unresolved violations. The most recent violation on record was 2025-07-01.
This system has more violations on record than 98% of water systems in Montana.
Violation trend: 13.4 per year over the last 5 years, up from 9.6 per year in the previous 5.
System Details
| Population Served | 2,100 |
| Service Connections | 432 |
| Water Source | Surface Water |
| System Type | Community Water System |
| Owner | Native American |
| Status | Active |
| City | Harlem |
| EPA ZIP on File | 59526 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
Violation History (143 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 2950 | MCL Measured: 0.1040 MG/L (limit: 0.0800 MG/L) | 2025-07-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.6800 RATIO | 2025-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.6800 RATIO | 2025-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1010 MG/L (limit: 0.0800 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1010 MG/L (limit: 0.0800 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1090 MG/L (limit: 0.0800 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1090 MG/L (limit: 0.0800 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1090 MG/L (limit: 0.0800 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.7100 RATIO | 2025-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.7100 RATIO | 2025-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.7100 RATIO | 2025-01-01 | Yes | Acknowledged |
| 2964 | MR | 2025-01-01 | Major | Acknowledged |
| 2964 | MR | 2025-01-01 | Major | Acknowledged |
| 2964 | MR | 2025-01-01 | Major | Acknowledged |
| 2950 | MCL Measured: 0.1150 MG/L (limit: 0.0800 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1150 MG/L (limit: 0.0800 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.7200 RATIO | 2024-10-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.7200 RATIO | 2024-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1140 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1140 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1140 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8100 RATIO | 2024-07-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8100 RATIO | 2024-07-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8100 RATIO | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1070 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1070 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1070 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1070 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO (limit: 1.00 RATIO) | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO (limit: 1.00 RATIO) | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8800 RATIO | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8800 RATIO | 2024-04-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8800 RATIO | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0950 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0950 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0950 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8900 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.9100 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.9100 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.9100 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.9800 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.9800 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.9800 RATIO | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0850 MG/L (limit: 0.0800 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0850 MG/L (limit: 0.0800 MG/L) | 2023-10-01 | Yes | Acknowledged |
Showing 50 of 143 historical violations.
Understanding This Water System's Record
Fort Belknap Agency Water System is a community water system water system that draws from surface water sources and serves a population of 2,100 in Harlem, Montana. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.