Non-Transient Non-Community Water System · PWS AZ0414044
Antelope Union High School
Operator location Wellton, Arizona - smaller served population (≤ 999) at 375 people served; 476 SDWIS violations on record from surface water sources.
- 375
- People served (this PWS) Smaller third of systems
- 476
- EPA violations (this PWS) Upper third of systems
- 59
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Antelope Union High School standing, high SDWIS violation third
375 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 12% is middle-third health share (≤ 23%).
The verdict
Antelope Union High School sits in the upper third of the sitemap cohort by violation count (476), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (375; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 12% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 476
- Total EPA violations on record
- 12%
- Health-based (MCL / treatment failure)
- 375
- 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.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 17
- County
- Yuma
- School/Daycare
- Yes
- MCL Violations
- 15
- Monitoring Violations
- 375
- Treatment Tech Violations
- 44
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 40 | 2016 |
| Total Haloacetic Acids (HAA5) | MR | 38 | 2025 |
| TTHM | MR | 38 | 2025 |
| E. COLI | MR | 36 | 2018 |
| Surface Water Treatment Rule | TT | 31 | 2004 |
| Chlorine | MR | 30 | 2024 |
| Interim Enhanced Surface Water Treatment Rule | MR | 23 | 2025 |
| Revised Total Coliform Rule | RPT | 22 | 2025 |
| Lead and Copper Rule | MR | 21 | 2021 |
| Surface Water Treatment Rule | MR | 16 | 2024 |
| Nitrate | MR | 16 | 2006 |
| Revised Total Coliform Rule | MON | 10 | 2024 |
| TTHM | MCL | 10 | 2017 |
| Mercury | MR | 8 | 1999 |
| Public Notice | Other | 8 | 2025 |
| Chromium | MR | 8 | 1999 |
| Barium | MR | 8 | 1999 |
| Cadmium | MR | 8 | 1999 |
| Selenium | MR | 8 | 1999 |
| Arsenic | MR | 8 | 1999 |
| Interim Enhanced Surface Water Treatment Rule | TT | 6 | 2025 |
| Fluoride | MR | 6 | 1991 |
| Total Haloacetic Acids (HAA5) | MCL | 5 | 2017 |
| Lead and Copper Rule | TT | 4 | 2017 |
| LEAD AND COPPER RULE REVISIONS | TT | 3 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 3 | 2024 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 2 | 2017 |
| Revised Total Coliform Rule | Other | 2 | 2021 |
| Beryllium, Total | MR | 2 | 1999 |
| Thallium, Total | MR | 2 | 1999 |
Violation Count vs. the National Corpus
Antelope Union High School has 476 recorded EPA violations, 95% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 5% carry more. 12% of this system's own violations are health-based (59 of 476), 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)
476 Higher than most more violations than 95% 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
How many violations vs. how serious, among peer systems
Antelope Union High School plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Population served record for Antelope Union High School
EPA SDWIS lists 375 people served and 17 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
476 violations · 375 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 Antelope Union High 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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.