Tsa Yah Toh NTUA
PWS ID: NN3500278 · Ft Defiance, Navajo Nation 86504
Population Served
865
Total Violations
77
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 253
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 71
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 3 | 2012 |
| TTHM | MR | 3 | 2020 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2020 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 2005 |
| Nitrite | MR | 1 | 2010 |
| Endrin | MR | 1 | 2004 |
| BHC-GAMMA | MR | 1 | 2004 |
| Methoxychlor | MR | 1 | 2004 |
| Toxaphene | MR | 1 | 2004 |
| Dalapon | MR | 1 | 2004 |
| Endothall | MR | 1 | 2004 |
| Glyphosate | MR | 1 | 2004 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2004 |
| OXAMYL | MR | 1 | 2004 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2004 |
| Picloram | MR | 1 | 2004 |
| Dinoseb | MR | 1 | 2004 |
| Hexachlorocyclopentadiene | MR | 1 | 2004 |
| Aldicarb sulfoxide | MR | 1 | 2004 |
| Aldicarb | MR | 1 | 2004 |
| Heptachlor epoxide | MR | 1 | 2004 |
| 2,4,5-TP | MR | 1 | 2004 |
| HEXACHLOROBENZENE | MR | 1 | 2004 |
| Benzo(a)pyrene | MR | 1 | 2004 |
| cis-1,2-Dichloroethylene | MR | 1 | 2005 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2004 |
| Chlordane | MR | 1 | 2004 |
| Vinyl chloride | MR | 1 | 2005 |
| 1,1-Dichloroethylene | MR | 1 | 2005 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.