Inscription House-Navajo Mountain NTUA
PWS ID: NN0400283 · Ft Defiance, Navajo Nation 86504
Population Served
1,368
Total Violations
175
Health-Based Violations
2
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 400
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 8
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 5 | 2012 |
| Coliform (TCR) | MCL | 2 | 2013 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 1 | 2013 |
| Revised Total Coliform Rule | Other | 1 | 2016 |
| Nitrate | MR | 1 | 2005 |
| Nitrite | MR | 1 | 2010 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.