Mexican Hat NTUA
PWS ID: NN4903032 · Ft Defiance, Navajo Nation 86504
Population Served
239
Total Violations
34
Health-Based Violations
2
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 70
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 20
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MR | 6 | 2020 |
| TTHM | MR | 6 | 2020 |
| Coliform (TCR) | MR | 6 | 2012 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2011 |
| Coliform (TCR) | MCL | 1 | 2011 |
| Revised Total Coliform Rule | Other | 1 | 2016 |
| 2,3,7,8-TCDD | MR | 1 | 2011 |
| Fluoride | MCL | 1 | 2010 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.