Dilcon Community Boarding School BIA
PWS ID: NN0436006 · Winslow, Navajo Nation 86047
Population Served
473
Total Violations
114
Health-Based Violations
30
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 60
- School/Daycare
- Yes
- MCL Violations
- 30
- Monitoring Violations
- 42
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 30 | 2024 |
| Public Notice | Other | 13 | 2025 |
| Coliform (TCR) | MR | 12 | 2012 |
| Arsenic | MR | 9 | 2025 |
| Consumer Confidence Rule | Other | 4 | 2006 |
| 2,3,7,8-TCDD | MR | 4 | 2008 |
| Fluoride | MR | 4 | 2008 |
| Revised Total Coliform Rule | MON | 3 | 2025 |
| Revised Total Coliform Rule | RPT | 3 | 2023 |
| Revised Total Coliform Rule | Other | 3 | 2016 |
| CYANIDE | MR | 3 | 2008 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| Nitrate | MR | 1 | 2024 |
| Nitrite | MR | 1 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2011 |
| Lead and Copper Rule | MR | 1 | 2004 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.