Whitehorse Lake NTUA
PWS ID: NN3500239 · Ft Defiance, Navajo Nation 86504
Population Served
277
Total Violations
60
Health-Based Violations
4
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 81
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 45
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrite | MR | 4 | 2013 |
| Antimony, Total | MCL | 4 | 2010 |
| Mercury | MR | 3 | 2008 |
| Thallium, Total | MR | 3 | 2008 |
| Endothall | MR | 3 | 2014 |
| Glyphosate | MR | 3 | 2014 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 2008 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 2008 |
| Nitrate | MR | 3 | 2013 |
| Coliform (TCR) | MR | 3 | 2012 |
| 2,3,7,8-TCDD | MR | 3 | 2014 |
| Fluoride | MR | 3 | 2008 |
| ETHYLENE DIBROMIDE | MR | 3 | 2008 |
| Diquat | MR | 3 | 2014 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 2 | 2013 |
| Combined Uranium | MR | 1 | 2005 |
| Combined Radium (-226 and -228) | MR | 1 | 2005 |
| Revised Total Coliform Rule | Other | 1 | 2016 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2005 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.