Community Water System · PWS AZ0409046
Holbrook SDA Indian School
Operator location Holbrook, Arizona - smaller served population (≤ 999) at 100 people served; 200 SDWIS violations on record from groundwater sources.
- 100
- People served (this PWS)
- 200
- EPA violations (this PWS)
- 2
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Holbrook SDA Indian School standing, high SDWIS violation third
100 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 1% is middle-third health share (≤ 23%).
The verdict
Holbrook SDA Indian School sits in the upper third of the sitemap cohort by violation count (200), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (100; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 1% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 200
- Total EPA violations on record
- 1%
- Health-based (MCL / treatment failure)
- 100
- 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
- Private
- Connections
- 25
- County
- Navajo
- School/Daycare
- Yes
- MCL Violations
- 2
- Monitoring Violations
- 182
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 36 | 2015 |
| Chlorine | MR | 19 | 2022 |
| Lead and Copper Rule | MR | 16 | 2023 |
| Revised Total Coliform Rule | MON | 11 | 2023 |
| TTHM | MR | 7 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 7 | 2023 |
| Nitrate | MR | 6 | 2005 |
| Revised Total Coliform Rule | RPT | 3 | 2018 |
| cis-1,2-Dichloroethylene | MR | 2 | 1998 |
| p-Dichlorobenzene | MR | 2 | 1998 |
| trans-1,2-Dichloroethylene | MR | 2 | 1998 |
| 1,2-Dichloroethane | MR | 2 | 1998 |
| 1,2-Dichloropropane | MR | 2 | 1998 |
| 1,1,2-Trichloroethane | MR | 2 | 1998 |
| Tetrachloroethylene | MR | 2 | 1998 |
| Benzene | MR | 2 | 1998 |
| Toluene | MR | 2 | 1998 |
| Ethylbenzene | MR | 2 | 1998 |
| Coliform (TCR) | MCL | 2 | 1997 |
| Barium | MR | 2 | 1989 |
| Mercury | MR | 2 | 1989 |
| Styrene | MR | 2 | 1998 |
| Cadmium | MR | 2 | 1989 |
| CHLOROBENZENE | MR | 2 | 1998 |
| Fluoride | MR | 2 | 1989 |
| DICHLOROMETHANE | MR | 2 | 1998 |
| Chromium | MR | 2 | 1989 |
| Arsenic | MR | 2 | 1989 |
| Selenium | MR | 2 | 1989 |
| o-Dichlorobenzene | MR | 2 | 1998 |
Violation Count vs. the National Corpus
Holbrook SDA Indian School has 200 recorded EPA violations, 85% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 15% carry more. 1% of this system's own violations are health-based (2 of 200), 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)
200 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
Population served record for Holbrook SDA Indian School
EPA SDWIS lists 100 people served and 25 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
200 violations · 100 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 Holbrook SDA Indian School
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Arizona compares on the same EPA violation measures. Arizona 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.