Community Water System · PWS NN0403006
LeChee NTUA
Operator location Ft Defiance, Navajo Nation - upper-third violation load (> 74 violations) with 108 EPA violations; surface water source; 1,115 served (PWS-level, not municipal population).
- 1,115
- People served (this PWS)
- 108
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
LeChee NTUA standing, high SDWIS violation third
108 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 8% is middle-third health share (≤ 23%). Population rank #18,470 of 29,740 among systems serving 500+.
The verdict
LeChee NTUA sits in the upper third of the sitemap cohort by violation count (108), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,115 (mid served population (≤ 3,309)). Health-based share is 8% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #18,470 of 29,740
- Population · /systems
- #38 of 82
- Population · NN
- 108
- Total EPA violations on record
- 8%
- 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
- 326
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 84
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 9 | 2010 |
| TTHM | MR | 8 | 2015 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2015 |
| Coliform (TCR) | MR | 2 | 2012 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 2 | 2013 |
| Barium | MR | 1 | 2008 |
| Cadmium | MR | 1 | 2008 |
| Chromium | MR | 1 | 2008 |
| CYANIDE | MR | 1 | 2008 |
| Nitrite | MR | 1 | 2010 |
| Thallium, Total | MR | 1 | 2008 |
| Endrin | MR | 1 | 2008 |
| Methoxychlor | MR | 1 | 2008 |
| Dalapon | MR | 1 | 2008 |
| Diquat | MR | 1 | 2008 |
| Simazine | MR | 1 | 2008 |
| Picloram | MR | 1 | 2008 |
| Dinoseb | MR | 1 | 2008 |
| LASSO | MR | 1 | 2008 |
| 2,3,7,8-TCDD | MR | 1 | 2008 |
| Heptachlor | MR | 1 | 2008 |
| Heptachlor epoxide | MR | 1 | 2008 |
| 2,4-D | MR | 1 | 2008 |
| 2,4,5-TP | MR | 1 | 2008 |
| Benzo(a)pyrene | MR | 1 | 2008 |
| Pentachlorophenol | MR | 1 | 2008 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2008 |
| ETHYLENE DIBROMIDE | MR | 1 | 2008 |
| Xylenes, Total | MR | 1 | 2008 |
| DICHLOROMETHANE | MR | 1 | 2008 |
Violation Count vs. the National Corpus
LeChee NTUA has 108 recorded EPA violations, 75% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 25% carry more. 8% of this system's own violations are health-based (9 of 108), and it ranks #18,470 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)
108 Around the middle fewer violations than 25% 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
SDWIS compliance record for LeChee NTUA
108 violations on record for NN0403006; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
108 violations · 1,115 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with LeChee 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.