PlainWater
States → Arizona

Community Water System · PWS AZ0407150

Epcor - Sun City West

El Mirage, Arizona 85335 - drinking water served from groundwater sources to 25,796 people, tracked in EPA SDWIS and UCMR5.

25,796
People served
110
EPA violations
3
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 110 drinking-water violations at Epcor - Sun City West, 3% of them health-based - below the Arizona per-system average.

110
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
25,796
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Epcor - Sun City West

Epcor - Sun City West is a private-owned community water system that delivers drinking water to 25,796 residents in El Mirage, Arizona (Maricopa County) through 15,634 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 110 total violations for this system , of which 3 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 98 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Arsenic, recorded in 19 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Epcor - Sun City West's 110 violations sit below 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
25,796
Total Violations
110
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
15,634
County
Maricopa
School/Daycare
No
MCL Violations
3
Monitoring Violations
98
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MR 19 2023
Nitrate MR 12 2007
Consumer Confidence Rule Other 7 2012
Coliform (TCR) MR 6 2007
Total Haloacetic Acids (HAA5) MR 6 2022
TTHM MR 4 2008
1,2,4-Trichlorobenzene MR 2 2007
cis-1,2-Dichloroethylene MR 2 2007
Xylenes, Total MR 2 2007
o-Dichlorobenzene MR 2 2007
p-Dichlorobenzene MR 2 2007
1,1-Dichloroethylene MR 2 2007
trans-1,2-Dichloroethylene MR 2 2007
1,2-Dichloroethane MR 2 2007
1,1,1-Trichloroethane MR 2 2007
1,2-Dichloropropane MR 2 2007
Tetrachloroethylene MR 2 2007
CHLOROBENZENE MR 2 2007
Toluene MR 2 2007
Ethylbenzene MR 2 2007
Styrene MR 2 2007
DICHLOROMETHANE MR 2 2007
Trichloroethylene MR 2 2007
Asbestos MR 2 2003
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2000
1,1,2-Trichloroethane MR 2 2007
Fluoride MCL 2 1988
Carbon tetrachloride MR 2 2007
Benzene MR 2 2007
Vinyl chloride MR 2 2007

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFNA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
11Cl-PF3OUdS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
PFOA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
NMeFOSAA 9/12/2023 <6.00 ppt 6.00 ppt Not Detected
PFPeS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
ADONA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/12/2023 <8.00 ppt 8.00 ppt Not Detected
NFDHA 9/12/2023 <20.00 ppt 20.00 ppt Not Detected
NEtFOSAA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/12/2023 <7.00 ppt 7.00 ppt Not Detected
PFHpA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
PFDA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 9/12/2023 <7.00 ppt 7.00 ppt Not Detected
PFOS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/12/2023 <6.00 ppt 6.00 ppt Not Detected
PFTA 9/12/2023 <8.00 ppt 8.00 ppt Not Detected
4:2 FTS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected

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 Epcor - Sun City West.

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 AZ0407150 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 Epcor - Sun City West 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
2023 Arsenic MR 19 SDWIS / AZ0407150 / 1005
2022 Total Haloacetic Acids (HAA5) MR 6 SDWIS / AZ0407150 / 2456
2017 Revised Total Coliform Rule RPT 1 SDWIS / AZ0407150 / 8000
2012 Consumer Confidence Rule Other 7 SDWIS / AZ0407150 / 7000
2008 TTHM MR 4 SDWIS / AZ0407150 / 2950
2007 Nitrate MR 12 SDWIS / AZ0407150 / 1040
2007 Coliform (TCR) MR 6 SDWIS / AZ0407150 / 3100
2007 1,2,4-Trichlorobenzene MR 2 SDWIS / AZ0407150 / 2378
2007 cis-1,2-Dichloroethylene MR 2 SDWIS / AZ0407150 / 2380
2007 Xylenes, Total MR 2 SDWIS / AZ0407150 / 2955
2007 o-Dichlorobenzene MR 2 SDWIS / AZ0407150 / 2968
2007 p-Dichlorobenzene MR 2 SDWIS / AZ0407150 / 2969
2007 1,1-Dichloroethylene MR 2 SDWIS / AZ0407150 / 2977
2007 trans-1,2-Dichloroethylene MR 2 SDWIS / AZ0407150 / 2979
2007 1,2-Dichloroethane MR 2 SDWIS / AZ0407150 / 2980

How Epcor - Sun City West Compares

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

Metric Epcor - Sun City West Arizona avg Federal benchmark
Total violations 110 153.3 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 25,796 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 Epcor - Sun City West water safe to drink? ▼
Epcor - Sun City West (PWS ID: AZ0407150) has 110 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 25,796 people using Groundwater sources.
How many people does Epcor - Sun City West serve? ▼
Epcor - Sun City West serves 25,796 people in El Mirage, Arizona. It is a Private-owned system using Groundwater water sources with 15,634 service connections.
What type of violations does Epcor - Sun City West have? ▼
Epcor - Sun City West has 110 total violations: 3 health-based violations (MCL exceedances or treatment failures), 98 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Epcor - Sun City West water? ▼
No. Epcor - Sun City West was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Epcor - Sun City West use? ▼
Epcor - Sun City West uses Groundwater 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.