Cottonwood Day School BIA
PWS ID: NN0435004 · Chinle, Navajo Nation 86503
Population Served
185
Total Violations
113
Health-Based Violations
5
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 28
- School/Daycare
- Yes
- MCL Violations
- 5
- Monitoring Violations
- 80
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 10 | 2012 |
| Consumer Confidence Rule | Other | 6 | 2006 |
| Di(2-ethylhexyl) phthalate | MCL | 5 | 2012 |
| 2,3,7,8-TCDD | MR | 5 | 2008 |
| Nitrate | MR | 3 | 2024 |
| Revised Total Coliform Rule | RPT | 3 | 2023 |
| Nitrite | MR | 3 | 2024 |
| Revised Total Coliform Rule | MON | 3 | 2025 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2012 |
| Endrin | MR | 1 | 2004 |
| BHC-GAMMA | MR | 1 | 2004 |
| Methoxychlor | MR | 1 | 2004 |
| Glyphosate | MR | 1 | 2004 |
| OXAMYL | MR | 1 | 2004 |
| Simazine | MR | 1 | 2004 |
| Picloram | MR | 1 | 2004 |
| Dinoseb | MR | 1 | 2004 |
| Hexachlorocyclopentadiene | MR | 1 | 2004 |
| Aldicarb sulfone | MR | 1 | 2004 |
| Carbofuran | MR | 1 | 2004 |
| Heptachlor epoxide | MR | 1 | 2004 |
| 2,4-D | MR | 1 | 2004 |
| 2,4,5-TP | MR | 1 | 2004 |
| HEXACHLOROBENZENE | MR | 1 | 2004 |
| cis-1,2-Dichloroethylene | MR | 1 | 2004 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2004 |
| ETHYLENE DIBROMIDE | MR | 1 | 2004 |
| DICHLOROMETHANE | MR | 1 | 2004 |
| Vinyl chloride | MR | 1 | 2004 |
| 1,1-Dichloroethylene | MR | 1 | 2004 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.