Gap-Cedar Ridge NTUA
PWS ID: NN0403009 · Fort Defiance, Navajo Nation 86504-0170
Population Served
1,125
Total Violations
88
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 329
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 86
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 4 | 2011 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 2014 |
| ETHYLENE DIBROMIDE | MR | 3 | 2014 |
| Nitrate | MR | 2 | 2015 |
| Endrin | MR | 2 | 2014 |
| BHC-GAMMA | MR | 2 | 2014 |
| Methoxychlor | MR | 2 | 2014 |
| Toxaphene | MR | 2 | 2014 |
| Diquat | MR | 2 | 2014 |
| Endothall | MR | 2 | 2014 |
| Glyphosate | MR | 2 | 2014 |
| Simazine | MR | 2 | 2014 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2014 |
| Atrazine | MR | 2 | 2014 |
| LASSO | MR | 2 | 2014 |
| 2,3,7,8-TCDD | MR | 2 | 2014 |
| Heptachlor | MR | 2 | 2014 |
| Heptachlor epoxide | MR | 2 | 2014 |
| Benzo(a)pyrene | MR | 2 | 2014 |
| Total Polychlorinated Biphenyls (PCB) | MR | 2 | 2014 |
| Chlordane | MR | 2 | 2014 |
| TTHM | MR | 2 | 2020 |
| HEXACHLOROBENZENE | MR | 2 | 2014 |
| Hexachlorocyclopentadiene | MR | 2 | 2014 |
| Di(2-ethylhexyl) adipate | MR | 2 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2020 |
| CYANIDE | MR | 1 | 2001 |
| Dalapon | MR | 1 | 2014 |
| OXAMYL | MR | 1 | 2014 |
| Picloram | MR | 1 | 2014 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.