Community Water System · PWS NN3500250
Pinehill Community and School
Operator location Tonalea, Navajo Nation - upper-third violation load (> 74 violations) with 726 EPA violations; groundwater source; 1,007 served (PWS-level, not municipal population).
- 1,007
- People served (this PWS)
- 726
- EPA violations (this PWS)
- 20
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Pinehill Community and School standing, high SDWIS violation third
726 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 3% is middle-third health share (≤ 23%). Population rank #19,348 of 29,740 among systems serving 500+.
The verdict
Pinehill Community and School sits in the upper third of the sitemap cohort by violation count (726), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,007 (mid served population (≤ 3,309)). Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #19,348 of 29,740
- Population · /systems
- #46 of 82
- Population · NN
- 726
- Total EPA violations on record
- 3%
- 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
- 267
- School/Daycare
- Yes
- MCL Violations
- 20
- Monitoring Violations
- 608
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 139 | 2012 |
| Nitrate | MR | 34 | 2024 |
| Revised Total Coliform Rule | MON | 25 | 2025 |
| Consumer Confidence Rule | Other | 21 | 2024 |
| Revised Total Coliform Rule | RPT | 17 | 2025 |
| Nitrite | MR | 14 | 2024 |
| Public Notice | Other | 13 | 2025 |
| Di(2-ethylhexyl) phthalate | MCL | 12 | 2014 |
| Barium | MR | 9 | 2011 |
| Selenium | MR | 9 | 2011 |
| Antimony, Total | MR | 9 | 2011 |
| Beryllium, Total | MR | 9 | 2011 |
| Thallium, Total | MR | 9 | 2011 |
| 2,3,7,8-TCDD | MR | 9 | 2008 |
| Fluoride | MR | 8 | 2011 |
| Total Polychlorinated Biphenyls (PCB) | MR | 7 | 2011 |
| Aldicarb sulfoxide | MR | 6 | 2005 |
| Aldicarb sulfone | MR | 6 | 2005 |
| Aldicarb | MR | 6 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 6 | 2005 |
| cis-1,2-Dichloroethylene | MR | 6 | 2005 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 6 | 2005 |
| ETHYLENE DIBROMIDE | MR | 6 | 2005 |
| Chlordane | MR | 6 | 2005 |
| DICHLOROMETHANE | MR | 6 | 2005 |
| o-Dichlorobenzene | MR | 6 | 2005 |
| p-Dichlorobenzene | MR | 6 | 2005 |
| 1,1-Dichloroethylene | MR | 6 | 2005 |
| trans-1,2-Dichloroethylene | MR | 6 | 2005 |
| 1,2-Dichloroethane | MR | 6 | 2005 |
Violation Count vs. the National Corpus
Pinehill Community and School has 726 recorded EPA violations, 98% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 2% carry more. 3% of this system's own violations are health-based (20 of 726), and it ranks #19,348 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)
726 Higher than most more violations than 98% 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 Pinehill Community and School
726 violations on record for NN3500250; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
726 violations · 1,007 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 Pinehill Community and School
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.