Community Water System · PWS NN0403058
Red Valley North NTUA
Operator location Ft Defiance, Navajo Nation - 0% of 44 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 756 served per SDWIS.
- 756
- People served (this PWS)
- 44
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Red Valley North NTUA standing, mid SDWIS violation third
0% of 44 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). Population rank #23,241 of 29,740 among systems serving 500+.
The verdict
Red Valley North NTUA lands in the middle third by violation volume (44), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (756; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is only 0% - almost all of this trail is monitoring or reporting. No UCMR5 PFAS test appears for this system in this extract.
- #23,241 of 29,740
- Population · /systems
- #64 of 82
- Population · NN
- 44
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 221
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 37
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 5 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2020 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| TTHM | MR | 3 | 2020 |
| Nitrate | MR | 1 | 2010 |
| cis-1,2-Dichloroethylene | MR | 1 | 2005 |
| Xylenes, Total | MR | 1 | 2005 |
| DICHLOROMETHANE | MR | 1 | 2005 |
| o-Dichlorobenzene | MR | 1 | 2005 |
| Vinyl chloride | MR | 1 | 2005 |
| 1,1-Dichloroethylene | MR | 1 | 2005 |
| trans-1,2-Dichloroethylene | MR | 1 | 2005 |
| 1,2-Dichloroethane | MR | 1 | 2005 |
| 1,1,1-Trichloroethane | MR | 1 | 2005 |
| Carbon tetrachloride | MR | 1 | 2005 |
| 1,2-Dichloropropane | MR | 1 | 2005 |
| Trichloroethylene | MR | 1 | 2005 |
| 1,1,2-Trichloroethane | MR | 1 | 2005 |
| CHLOROBENZENE | MR | 1 | 2005 |
| Benzene | MR | 1 | 2005 |
| Toluene | MR | 1 | 2005 |
| Ethylbenzene | MR | 1 | 2005 |
| Styrene | MR | 1 | 2005 |
| Tetrachloroethylene | MR | 1 | 2005 |
| p-Dichlorobenzene | MR | 1 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2005 |
| Nitrite | MR | 1 | 2010 |
Violation Count vs. the National Corpus
Red Valley North NTUA has 44 recorded EPA violations, 53% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 46% carry more. 0% of this system's own violations are health-based (0 of 44), and it ranks #23,241 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
44 Around the middle fewer violations than 46% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Red Valley North NTUA
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NN0403058.
Sources: EPA SDWIS
Nationwide peers
44 violations · 756 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Red Valley North NTUA
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Navajo Nation compares on the same EPA violation measures. Navajo Nation systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.