Non-Transient Non-Community Water System · PWS NN0435212
Rough Rock Community High School BIA
Operator location Chinle, Navajo Nation - 24% of 134 violations are health-based (upper-third health share (> 23%)); groundwater source; 350 served per SDWIS.
- 350
- People served (this PWS)
- 134
- EPA violations (this PWS)
- 32
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Rough Rock Community High School BIA standing, high SDWIS violation third
24% of 134 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 24% is upper-third health share (> 23%).
The verdict
Rough Rock Community High School BIA sits in the upper third of the sitemap cohort by violation count (134), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (350; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 24% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 134
- Total EPA violations on record
- 24%
- Health-based (MCL / treatment failure)
- 350
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Federal
- Connections
- 27
- School/Daycare
- Yes
- MCL Violations
- 30
- Monitoring Violations
- 59
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 30 | 2023 |
| Arsenic | MR | 11 | 2025 |
| Coliform (TCR) | MR | 8 | 2012 |
| Public Notice | Other | 8 | 2023 |
| Revised Total Coliform Rule | RPT | 5 | 2025 |
| 2,3,7,8-TCDD | MR | 4 | 2008 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 4 | 2013 |
| Fluoride | MR | 4 | 2008 |
| Revised Total Coliform Rule | Other | 4 | 2016 |
| Lead and Copper Rule | MR | 2 | 2008 |
| Revised Total Coliform Rule | TT | 2 | 2016 |
| Nitrate | MR | 1 | 2024 |
| cis-1,2-Dichloroethylene | MR | 1 | 2004 |
| Xylenes, Total | MR | 1 | 2004 |
| DICHLOROMETHANE | MR | 1 | 2004 |
| o-Dichlorobenzene | MR | 1 | 2004 |
| p-Dichlorobenzene | MR | 1 | 2004 |
| 1,1,1-Trichloroethane | MR | 1 | 2004 |
| Carbon tetrachloride | MR | 1 | 2004 |
| Trichloroethylene | MR | 1 | 2004 |
| Tetrachloroethylene | MR | 1 | 2004 |
| Benzene | MR | 1 | 2004 |
| Ethylbenzene | MR | 1 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2010 |
| Revised Total Coliform Rule | MON | 1 | 2020 |
| 1,2-Dichloropropane | MR | 1 | 2004 |
| CHLOROBENZENE | MR | 1 | 2004 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2004 |
| trans-1,2-Dichloroethylene | MR | 1 | 2004 |
| Styrene | MR | 1 | 2004 |
Violation Count vs. the National Corpus
Rough Rock Community High School BIA has 134 recorded EPA violations, 79% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 21% carry more. 24% of this system's own violations are health-based (32 of 134), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
134 Higher than most more violations than 79% 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 Rough Rock Community High School BIA
32 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NN0435212.
Sources: EPA SDWIS
Nationwide peers
134 violations · 350 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.
What to do with Rough Rock Community High School BIA
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.