Chevron Coal Company - North Mine
PWS ID: NN3500332 · Questa, Navajo Nation 87556
Population Served
26
Total Violations
141
Health-Based Violations
6
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 3
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 121
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 11 | 2017 |
| Coliform (TCR) | MR | 11 | 2013 |
| Nitrite | MR | 9 | 2017 |
| Revised Total Coliform Rule | MON | 9 | 2023 |
| Coliform (TCR) | MCL | 6 | 2009 |
| Glyphosate | MR | 5 | 2008 |
| 2,3,7,8-TCDD | MR | 5 | 2008 |
| CYANIDE | MR | 4 | 2008 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 4 | 2013 |
| Revised Total Coliform Rule | RPT | 3 | 2023 |
| Revised Total Coliform Rule | Other | 3 | 2016 |
| Arsenic | MR | 1 | 2004 |
| Cadmium | MR | 1 | 2004 |
| Mercury | MR | 1 | 2004 |
| Nitrate-Nitrite | MR | 1 | 2004 |
| Endrin | MR | 1 | 2004 |
| Methoxychlor | MR | 1 | 2004 |
| Toxaphene | MR | 1 | 2004 |
| Endothall | MR | 1 | 2004 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2004 |
| OXAMYL | MR | 1 | 2004 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2004 |
| Dinoseb | MR | 1 | 2004 |
| Hexachlorocyclopentadiene | MR | 1 | 2004 |
| Aldicarb sulfoxide | MR | 1 | 2004 |
| Aldicarb | MR | 1 | 2004 |
| Atrazine | MR | 1 | 2004 |
| LASSO | MR | 1 | 2004 |
| 2,4-D | MR | 1 | 2004 |
| HEXACHLOROBENZENE | MR | 1 | 2004 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.