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Non-Transient Non-Community Water System · PWS AZ0414044

Antelope Union High School

Wellton, Arizona 85356 - drinking water served from surface water sources to 375 people, tracked in EPA SDWIS and UCMR5.

375
People served
476
EPA violations
59
Health-based
Untested
UCMR5 result

The verdict

EPA records 476 drinking-water violations at Antelope Union High School, 12% of them health-based - above the Arizona per-system average.

476
Total EPA violations on record
12%
Health-based (MCL / treatment failure)
375
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Antelope Union High School

Antelope Union High School is a local-owned non-transient non-community water system that delivers drinking water to 375 residents in Wellton, Arizona (Yuma County) through 17 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 476 total violations for this system , of which 59 (12%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 375 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 40 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Arizona, EPA tracks 1,493 public water systems serving 7,322,166 people, with 228,944 cumulative violations and 15,663 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 153.3 violations. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Antelope Union High School's 476 violations sit above the Arizona average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
375
Total Violations
476
Health-Based Violations
59
Water Source
Surface Water

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

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Antelope Union High School.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID AZ0414044 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Arizona Drinking Water Authority

Arizona DEQ, Drinking Water Program is the primacy agency that licenses and inspects Antelope Union High School under EPA-delegated authority.

Open AZ regulator portal

Source: Arizona DEQ, Drinking Water Program

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Total Haloacetic Acids (HAA5) MR 38 SDWIS / AZ0414044 / 2456
2025 TTHM MR 38 SDWIS / AZ0414044 / 2950
2025 Interim Enhanced Surface Water Treatment Rule MR 23 SDWIS / AZ0414044 / 0300
2025 Revised Total Coliform Rule RPT 22 SDWIS / AZ0414044 / 8000
2025 Public Notice Other 8 SDWIS / AZ0414044 / 7500
2025 Interim Enhanced Surface Water Treatment Rule TT 6 SDWIS / AZ0414044 / 0300
2024 Chlorine MR 30 SDWIS / AZ0414044 / 0999
2024 Surface Water Treatment Rule MR 16 SDWIS / AZ0414044 / 0200
2024 Revised Total Coliform Rule MON 10 SDWIS / AZ0414044 / 8000
2024 LEAD AND COPPER RULE REVISIONS TT 3 SDWIS / AZ0414044 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 3 SDWIS / AZ0414044 / 5200
2021 Lead and Copper Rule MR 21 SDWIS / AZ0414044 / 5000
2021 Revised Total Coliform Rule Other 2 SDWIS / AZ0414044 / 8000
2018 E. COLI MR 36 SDWIS / AZ0414044 / 3014
2017 TTHM MCL 10 SDWIS / AZ0414044 / 2950

How Antelope Union High School Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Antelope Union High School Arizona avg Federal benchmark
Total violations 476 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 59 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 375 4,904 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,493 regulated public water systems in Arizona.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Antelope Union High School water safe to drink? ▼
Antelope Union High School (PWS ID: AZ0414044) has 476 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 375 people using Surface Water sources.
How many people does Antelope Union High School serve? ▼
Antelope Union High School serves 375 people in Wellton, Arizona. It is a Local-owned system using Surface Water water sources with 17 service connections.
What type of violations does Antelope Union High School have? ▼
Antelope Union High School has 476 total violations: 59 health-based violations (MCL exceedances or treatment failures), 375 monitoring/reporting violations, and 44 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Antelope Union High School water? ▼
No PFAS testing data is available for Antelope Union High School under the EPA's UCMR5 monitoring program.
What water source does Antelope Union High School use? ▼
Antelope Union High School uses Surface Water as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.