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Community Water System · PWS AZ0414001

Antelope Water Company

Wellton, Arizona 85356 - drinking water served from surface water sources to 163 people, tracked in EPA SDWIS and UCMR5.

163
People served
388
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 388 drinking-water violations at Antelope Water Company, 1% of them health-based - above the Arizona per-system average.

388
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
163
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Antelope Water Company

Antelope Water Company is a private-owned community water system that delivers drinking water to 163 residents in Wellton, Arizona (Yuma County) through 65 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 388 total violations for this system , of which 3 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 329 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 Total Haloacetic Acids (HAA5), recorded in 31 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 Water Company's 388 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
163
Total Violations
388
Health-Based Violations
3
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
65
County
Yuma
School/Daycare
No
MCL Violations
1
Monitoring Violations
329
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Total Haloacetic Acids (HAA5) MR 31 2025
TTHM MR 30 2025
Coliform (TCR) MR 27 2014
Chlorine MR 22 2023
Surface Water Treatment Rule MR 21 2023
Interim Enhanced Surface Water Treatment Rule MR 18 2023
Nitrate MR 16 2002
Revised Total Coliform Rule MON 12 2021
Consumer Confidence Rule Other 10 2020
Public Notice Other 10 2024
Revised Total Coliform Rule RPT 9 2025
Fluoride MR 9 1999
Mercury MR 9 1999
Arsenic MR 9 1999
Selenium MR 8 1999
Barium MR 8 1999
Chromium MR 8 1999
Cadmium MR 8 1999
Lead and Copper Rule MR 7 2021
Endrin MR 3 1998
Methoxychlor MR 3 1998
2,4-D MR 3 1998
2,4,5-TP MR 3 1998
Toxaphene MR 3 1998
BHC-GAMMA MR 3 1998
cis-1,2-Dichloroethylene MR 2 1998
DICHLOROMETHANE MR 2 1998
p-Dichlorobenzene MR 2 1998
1,1-Dichloroethylene MR 2 1998
trans-1,2-Dichloroethylene MR 2 1998

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 Water Company.

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 AZ0414001 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 Water Company 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 31 SDWIS / AZ0414001 / 2456
2025 TTHM MR 30 SDWIS / AZ0414001 / 2950
2025 Revised Total Coliform Rule RPT 9 SDWIS / AZ0414001 / 8000
2024 Public Notice Other 10 SDWIS / AZ0414001 / 7500
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / AZ0414001 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / AZ0414001 / 5200
2023 Chlorine MR 22 SDWIS / AZ0414001 / 0999
2023 Surface Water Treatment Rule MR 21 SDWIS / AZ0414001 / 0200
2023 Interim Enhanced Surface Water Treatment Rule MR 18 SDWIS / AZ0414001 / 0300
2021 Revised Total Coliform Rule MON 12 SDWIS / AZ0414001 / 8000
2021 Lead and Copper Rule MR 7 SDWIS / AZ0414001 / 5000
2020 Consumer Confidence Rule Other 10 SDWIS / AZ0414001 / 7000
2018 E. COLI MR 2 SDWIS / AZ0414001 / 3014
2014 Coliform (TCR) MR 27 SDWIS / AZ0414001 / 3100
2006 TTHM MCL 1 SDWIS / AZ0414001 / 2950

How Antelope Water Company Compares

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

Metric Antelope Water Company Arizona avg Federal benchmark
Total violations 388 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 163 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 Water Company water safe to drink? ▼
Antelope Water Company (PWS ID: AZ0414001) has 388 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 163 people using Surface Water sources.
How many people does Antelope Water Company serve? ▼
Antelope Water Company serves 163 people in Wellton, Arizona. It is a Private-owned system using Surface Water water sources with 65 service connections.
What type of violations does Antelope Water Company have? ▼
Antelope Water Company has 388 total violations: 3 health-based violations (MCL exceedances or treatment failures), 329 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Antelope Water Company water? ▼
No PFAS testing data is available for Antelope Water Company under the EPA's UCMR5 monitoring program.
What water source does Antelope Water Company use? ▼
Antelope Water Company uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
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.