PlainWater
States → Arizona

Community Water System · PWS AZ0407056

Epcor - Paradise Valley/Scottsdale

El Mirage, Arizona 85335 - drinking water served from surface water sources to 14,107 people, tracked in EPA SDWIS and UCMR5.

14,107
People served
94
EPA violations
4
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 94 drinking-water violations at Epcor - Paradise Valley/Scottsdale, 4% of them health-based - below the Arizona per-system average.

94
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
14,107
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Epcor - Paradise Valley/Scottsdale

Epcor - Paradise Valley/Scottsdale is a private-owned community water system that delivers drinking water to 14,107 residents in El Mirage, Arizona (Maricopa County) through 5,643 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 94 total violations for this system , of which 4 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 76 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Nitrate, recorded in 15 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 - Paradise Valley/Scottsdale's 94 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
14,107
Total Violations
94
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
5,643
County
Maricopa
School/Daycare
No
MCL Violations
4
Monitoring Violations
76
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 15 2007
Coliform (TCR) MR 8 2012
Consumer Confidence Rule Other 7 2012
2,3,7,8-TCDD MR 5 2011
Arsenic MR 3 2024
Chlorine MR 3 2013
Endrin MR 2 2002
Coliform (TCR) MCL 2 2001
Methoxychlor MR 2 2002
Di(2-ethylhexyl) phthalate MR 2 2002
Hexachlorocyclopentadiene MR 2 2002
Atrazine MR 2 2002
LASSO MR 2 2002
HEXACHLOROBENZENE MR 2 2002
Toxaphene MR 2 2002
Di(2-ethylhexyl) adipate MR 2 2002
Trichloroethylene MCL 2 2008
Surface Water Treatment Rule MR 2 2024
Chromium MR 2 1990
Simazine MR 2 2002
Chlordane MR 2 2002
OXAMYL MR 1 1999
Picloram MR 1 1999
Dinoseb MR 1 1999
Carbofuran MR 1 1999
2,4-D MR 1 1999
Lead and Copper Rule MR 1 2004
Revised Total Coliform Rule RPT 1 2018
Gross Alpha, Excl. Radon and U MR 1 1987
Endothall MR 1 1999

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.

Contaminant Date Result MRL Status
4:2 FTS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 8/3/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFTA 8/3/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 8/3/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 8/3/2023 <6.00 ppt 6.00 ppt Not Detected
PFHxA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFOS 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 8/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFUnA 8/3/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 8/3/2023 <2.00 ppt 2.00 ppt Not Detected
6:2 FTS 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 8/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 8/3/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 2/7/2024 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 2/7/2024 <5.00 ppt 5.00 ppt Not Detected
PFBA 2/7/2024 <5.00 ppt 5.00 ppt Not Detected
PFMPA 2/7/2024 <4.00 ppt 4.00 ppt Not Detected
ADONA 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 2/7/2024 <5.00 ppt 5.00 ppt Not Detected
PFPeA 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 2/7/2024 <2.00 ppt 2.00 ppt Not Detected
PFEESA 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxA 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
NFDHA 2/7/2024 <20.00 ppt 20.00 ppt Not Detected
PFPeS 2/7/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpS 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
PFMBA 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 2/7/2024 <5.00 ppt 5.00 ppt Not Detected
11Cl-PF3OUdS 2/7/2024 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 2/7/2024 <7.00 ppt 7.00 ppt Not Detected
NMeFOSAA 2/7/2024 <6.00 ppt 6.00 ppt Not Detected
PFBS 2/7/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpA 2/7/2024 <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 - Paradise Valley/Scottsdale.

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 AZ0407056 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 - Paradise Valley/Scottsdale 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
2024 Arsenic MR 3 SDWIS / AZ0407056 / 1005
2024 Surface Water Treatment Rule MR 2 SDWIS / AZ0407056 / 0200
2018 Revised Total Coliform Rule RPT 1 SDWIS / AZ0407056 / 8000
2013 Chlorine MR 3 SDWIS / AZ0407056 / 0999
2012 Coliform (TCR) MR 8 SDWIS / AZ0407056 / 3100
2012 Consumer Confidence Rule Other 7 SDWIS / AZ0407056 / 7000
2011 2,3,7,8-TCDD MR 5 SDWIS / AZ0407056 / 2063
2008 Trichloroethylene MCL 2 SDWIS / AZ0407056 / 2984
2007 Nitrate MR 15 SDWIS / AZ0407056 / 1040
2004 Lead and Copper Rule MR 1 SDWIS / AZ0407056 / 5000
2002 Endrin MR 2 SDWIS / AZ0407056 / 2005
2002 Methoxychlor MR 2 SDWIS / AZ0407056 / 2015
2002 Di(2-ethylhexyl) phthalate MR 2 SDWIS / AZ0407056 / 2039
2002 Hexachlorocyclopentadiene MR 2 SDWIS / AZ0407056 / 2042
2002 Atrazine MR 2 SDWIS / AZ0407056 / 2050

How Epcor - Paradise Valley/Scottsdale Compares

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

Metric Epcor - Paradise Valley/Scottsdale Arizona avg Federal benchmark
Total violations 94 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 14,107 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 - Paradise Valley/Scottsdale water safe to drink? ▼
Epcor - Paradise Valley/Scottsdale (PWS ID: AZ0407056) has 94 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 14,107 people using Surface Water sources.
How many people does Epcor - Paradise Valley/Scottsdale serve? ▼
Epcor - Paradise Valley/Scottsdale serves 14,107 people in El Mirage, Arizona. It is a Private-owned system using Surface Water water sources with 5,643 service connections.
What type of violations does Epcor - Paradise Valley/Scottsdale have? ▼
Epcor - Paradise Valley/Scottsdale has 94 total violations: 4 health-based violations (MCL exceedances or treatment failures), 76 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Epcor - Paradise Valley/Scottsdale water? ▼
No. Epcor - Paradise Valley/Scottsdale was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Epcor - Paradise Valley/Scottsdale use? ▼
Epcor - Paradise Valley/Scottsdale 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. 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.