Community Water System · PWS NN0436019
Seba Dalkai Boarding School BIA
Operator location Winslow, Navajo Nation - 51% of 191 violations are health-based (upper-third health share (> 23%)); groundwater source; 250 served per SDWIS.
- 250
- People served (this PWS)
- 191
- EPA violations (this PWS)
- 97
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Seba Dalkai Boarding School BIA standing, high SDWIS violation third
51% of 191 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 51% is upper-third health share (> 23%).
The verdict
Seba Dalkai Boarding School BIA sits in the upper third of the sitemap cohort by violation count (191), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (250; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 51% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 191
- Total EPA violations on record
- 51%
- Health-based (MCL / treatment failure)
- 250
- 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
- Community
- Owner Type
- Federal
- Connections
- 20
- School/Daycare
- Yes
- MCL Violations
- 97
- Monitoring Violations
- 58
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 80 | 2021 |
| Coliform (TCR) | MR | 25 | 2012 |
| Coliform (TCR) | MCL | 17 | 2012 |
| TTHM | MR | 12 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2022 |
| Public Notice | Other | 9 | 2021 |
| Revised Total Coliform Rule | RPT | 4 | 2025 |
| Lead and Copper Rule | MR | 4 | 2008 |
| Revised Total Coliform Rule | Other | 3 | 2016 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| Revised Total Coliform Rule | MON | 2 | 2025 |
Violation Count vs. the National Corpus
Seba Dalkai Boarding School BIA has 191 recorded EPA violations, 85% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 15% carry more. 51% of this system's own violations are health-based (97 of 191), 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)
191 Higher than most more violations than 85% 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 Seba Dalkai Boarding School BIA
97 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NN0436019.
Sources: EPA SDWIS
Nationwide peers
191 violations · 250 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 Seba Dalkai Boarding 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.