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Community Water System · PWS AZ0415010

Epcor - Lakeside

El Mirage, Arizona 85335 - drinking water served from surface water sources to 1,775 people, tracked in EPA SDWIS and UCMR5.

1,775
People served
373
EPA violations
28
Health-based
Untested
UCMR5 result

The verdict

EPA records 373 drinking-water violations at Epcor - Lakeside, 8% of them health-based - above the Arizona per-system average.

373
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
1,775
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Epcor - Lakeside

Epcor - Lakeside is a private-owned community water system that delivers drinking water to 1,775 residents in El Mirage, Arizona (La Paz County) through 807 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 373 total violations for this system , of which 28 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 272 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Chlorine, recorded in 29 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%).

Epcor - Lakeside's 373 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
1,775
Total Violations
373
Health-Based Violations
28
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
807
County
La Paz
School/Daycare
No
MCL Violations
2
Monitoring Violations
272
Treatment Tech Violations
26

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 29 2020
Coliform (TCR) MR 28 2015
Interim Enhanced Surface Water Treatment Rule MR 21 2015
Consumer Confidence Rule Other 17 2015
Interim Enhanced Surface Water Treatment Rule TT 16 2020
Revised Total Coliform Rule MON 16 2019
Total Haloacetic Acids (HAA5) MR 15 2020
TTHM MR 14 2020
Surface Water Treatment Rule MR 11 2015
E. COLI MR 10 2018
Surface Water Treatment Rule TT 10 2020
Nitrate MR 10 2004
Xylenes, Total MR 9 2001
DICHLOROMETHANE MR 9 2001
Public Notice Other 8 2021
Selenium MR 5 1998
Arsenic MR 5 1998
Barium MR 5 1998
Chromium MR 5 1998
Mercury MR 5 1998
Fluoride MR 5 1998
Cadmium MR 5 1998
Lead and Copper Rule MR 4 2021
Endothall MR 3 2001
2,4,5-TP MR 2 1998
Coliform (TCR) MCL 2 2011
BHC-GAMMA MR 2 1998
2,4-D MR 2 1998
Toxaphene MR 2 1998
Endrin 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 Epcor - Lakeside.

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 AZ0415010 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 - Lakeside 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
2021 Public Notice Other 8 SDWIS / AZ0415010 / 7500
2021 Lead and Copper Rule MR 4 SDWIS / AZ0415010 / 5000
2020 Chlorine MR 29 SDWIS / AZ0415010 / 0999
2020 Interim Enhanced Surface Water Treatment Rule TT 16 SDWIS / AZ0415010 / 0300
2020 Total Haloacetic Acids (HAA5) MR 15 SDWIS / AZ0415010 / 2456
2020 TTHM MR 14 SDWIS / AZ0415010 / 2950
2020 Surface Water Treatment Rule TT 10 SDWIS / AZ0415010 / 0200
2019 Revised Total Coliform Rule MON 16 SDWIS / AZ0415010 / 8000
2019 Revised Total Coliform Rule RPT 2 SDWIS / AZ0415010 / 8000
2018 E. COLI MR 10 SDWIS / AZ0415010 / 3014
2015 Coliform (TCR) MR 28 SDWIS / AZ0415010 / 3100
2015 Interim Enhanced Surface Water Treatment Rule MR 21 SDWIS / AZ0415010 / 0300
2015 Consumer Confidence Rule Other 17 SDWIS / AZ0415010 / 7000
2015 Surface Water Treatment Rule MR 11 SDWIS / AZ0415010 / 0200
2011 Coliform (TCR) MCL 2 SDWIS / AZ0415010 / 3100

How Epcor - Lakeside Compares

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

Metric Epcor - Lakeside Arizona avg Federal benchmark
Total violations 373 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 28 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 1,775 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 - Lakeside water safe to drink? ▼
Epcor - Lakeside (PWS ID: AZ0415010) has 373 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,775 people using Surface Water sources.
How many people does Epcor - Lakeside serve? ▼
Epcor - Lakeside serves 1,775 people in El Mirage, Arizona. It is a Private-owned system using Surface Water water sources with 807 service connections.
What type of violations does Epcor - Lakeside have? ▼
Epcor - Lakeside has 373 total violations: 28 health-based violations (MCL exceedances or treatment failures), 272 monitoring/reporting violations, and 26 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Epcor - Lakeside water? ▼
No PFAS testing data is available for Epcor - Lakeside under the EPA's UCMR5 monitoring program.
What water source does Epcor - Lakeside use? ▼
Epcor - Lakeside 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.