Shonto Preparatory Boarding School BIA
PWS ID: NN0433016 · Shonto, Navajo Nation 86054
Population Served
664
Total Violations
106
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 166
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 82
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| 2,3,7,8-TCDD | MR | 5 | 2008 |
| Coliform (TCR) | MR | 5 | 2014 |
| Revised Total Coliform Rule | RPT | 4 | 2024 |
| Consumer Confidence Rule | Other | 4 | 2006 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| Revised Total Coliform Rule | Other | 3 | 2016 |
| E. COLI | MR | 2 | 2018 |
| Arsenic | MR | 1 | 2008 |
| Barium | MR | 1 | 2008 |
| Cadmium | MR | 1 | 2008 |
| Fluoride | MR | 1 | 2008 |
| Selenium | MR | 1 | 2008 |
| Thallium, Total | MR | 1 | 2008 |
| Endrin | MR | 1 | 2004 |
| Methoxychlor | MR | 1 | 2004 |
| Toxaphene | MR | 1 | 2004 |
| Diquat | 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 |
| Hexachlorocyclopentadiene | MR | 1 | 2004 |
| Aldicarb sulfoxide | MR | 1 | 2004 |
| Aldicarb sulfone | MR | 1 | 2004 |
| Aldicarb | MR | 1 | 2004 |
| Heptachlor | MR | 1 | 2004 |
| 2,4-D | MR | 1 | 2004 |
| 2,4,5-TP | MR | 1 | 2004 |
| Benzo(a)pyrene | MR | 1 | 2004 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.