Houck-Querino Canyon NTUA
PWS ID: NN0400280 · Ft Defiance, Navajo Nation 86504
Population Served
1,023
Total Violations
46
Health-Based Violations
8
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 299
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 24
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 6 | 2015 |
| Coliform (TCR) | MR | 3 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2020 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| TTHM | MR | 3 | 2020 |
| Diquat | MR | 2 | 2008 |
| Endothall | MR | 2 | 2008 |
| Glyphosate | MR | 2 | 2008 |
| 2,3,7,8-TCDD | MR | 2 | 2008 |
| ETHYLENE DIBROMIDE | MR | 2 | 2008 |
| Revised Total Coliform Rule | TT | 2 | 2016 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 2 | 2008 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.