Navajo National Monument
PWS ID: NN0400339 · Chinle, Navajo Nation 86503
Population Served
25
Total Violations
348
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Federal
- Connections
- 14
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 310
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | RPT | 29 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 16 | 2014 |
| TTHM | MR | 16 | 2014 |
| Nitrate | MR | 14 | 2018 |
| Nitrite | MR | 14 | 2018 |
| Coliform (TCR) | MR | 12 | 2015 |
| Revised Total Coliform Rule | MON | 8 | 2021 |
| Arsenic | MR | 6 | 2011 |
| Cadmium | MR | 6 | 2011 |
| CYANIDE | MR | 6 | 2011 |
| Mercury | MR | 6 | 2011 |
| Selenium | MR | 6 | 2011 |
| Antimony, Total | MR | 6 | 2011 |
| Thallium, Total | MR | 6 | 2011 |
| Picloram | MR | 6 | 2011 |
| Total Polychlorinated Biphenyls (PCB) | MR | 6 | 2011 |
| Chromium | MR | 6 | 2011 |
| Beryllium, Total | MR | 6 | 2011 |
| Barium | MR | 6 | 2011 |
| Lead and Copper Rule | MR | 5 | 2008 |
| Endrin | MR | 3 | 2011 |
| Methoxychlor | MR | 3 | 2011 |
| Toxaphene | MR | 3 | 2011 |
| Dalapon | MR | 3 | 2011 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2011 |
| OXAMYL | MR | 3 | 2011 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2011 |
| Hexachlorocyclopentadiene | MR | 3 | 2011 |
| Atrazine | MR | 3 | 2011 |
| LASSO | MR | 3 | 2011 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.