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Community Water System · PWS AZ0407025

Phoenix City Of

Phoenix, Arizona 85009 - drinking water served from surface water sources to 1,695,000 people, tracked in EPA SDWIS and UCMR5.

1,695,000
People served
84
EPA violations
6
Health-based
2 PFAS
UCMR5 result

The verdict

EPA records 84 drinking-water violations at Phoenix City Of, 7% of them health-based - below the Arizona per-system average, and UCMR5 testing detected 2 PFAS compounds.

84
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
1,695,000
People served by this system
2
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Phoenix City Of

Phoenix City Of is a local-owned community water system that delivers drinking water to 1,695,000 residents in Phoenix, Arizona (Maricopa County) through 430,118 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 84 total violations for this system , of which 6 (7%) 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 2025.

The most frequently cited contaminant at this system is OXAMYL, recorded in 5 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 2 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 16 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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%).

Phoenix City Of's 84 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.

PFAS Detected

2 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
1,695,000
Total Violations
84
Health-Based Violations
6
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
430,118
County
Maricopa
School/Daycare
No
MCL Violations
2
Monitoring Violations
76
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
OXAMYL MR 5 1999
Interim Enhanced Surface Water Treatment Rule TT 4 2021
Endrin MR 3 1999
BHC-GAMMA MR 3 1999
Methoxychlor MR 3 1999
Toxaphene MR 3 1999
Arsenic MR 3 2018
2,4,5-TP MR 2 1999
Pentachlorophenol MR 2 1999
Revised Total Coliform Rule MON 2 2025
Dalapon MR 2 1999
Diquat MR 2 1999
Di(2-ethylhexyl) phthalate MR 2 1999
Dinoseb MR 2 1999
Hexachlorocyclopentadiene MR 2 1999
Carbofuran MR 2 1999
Atrazine MR 2 1999
Heptachlor MR 2 1999
Heptachlor epoxide MR 2 1999
Nitrate MR 2 1998
Endothall MR 2 1999
LASSO MR 2 1999
2,4-D MR 2 1999
Chlordane MR 2 1999
Simazine MR 2 1999
Asbestos MR 2 2014
Di(2-ethylhexyl) adipate MR 2 1999
Surface Water Treatment Rule MR 2 2025
Picloram MR 2 1999
1,2-DIBROMO-3-CHLOROPROPANE MR 1 1999

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 18 of 1512 samples detected PFAS.

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

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 AZ0407025 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 Phoenix City Of 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 Revised Total Coliform Rule MON 2 SDWIS / AZ0407025 / 8000
2025 Surface Water Treatment Rule MR 2 SDWIS / AZ0407025 / 0200
2021 Interim Enhanced Surface Water Treatment Rule TT 4 SDWIS / AZ0407025 / 0300
2018 Arsenic MR 3 SDWIS / AZ0407025 / 1005
2014 Asbestos MR 2 SDWIS / AZ0407025 / 1094
2014 Coliform (TCR) MCL 1 SDWIS / AZ0407025 / 3100
1999 OXAMYL MR 5 SDWIS / AZ0407025 / 2036
1999 Endrin MR 3 SDWIS / AZ0407025 / 2005
1999 BHC-GAMMA MR 3 SDWIS / AZ0407025 / 2010
1999 Methoxychlor MR 3 SDWIS / AZ0407025 / 2015
1999 Toxaphene MR 3 SDWIS / AZ0407025 / 2020
1999 2,4,5-TP MR 2 SDWIS / AZ0407025 / 2110
1999 Pentachlorophenol MR 2 SDWIS / AZ0407025 / 2326
1999 Dalapon MR 2 SDWIS / AZ0407025 / 2031
1999 Diquat MR 2 SDWIS / AZ0407025 / 2032

How Phoenix City Of Compares

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

Metric Phoenix City Of Arizona avg Federal benchmark
Total violations 84 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection 2 compounds 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,695,000 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 Phoenix City Of water safe to drink? ▼
Phoenix City Of (PWS ID: AZ0407025) has 84 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 2 PFAS compounds found. This system serves 1,695,000 people using Surface Water sources.
How many people does Phoenix City Of serve? ▼
Phoenix City Of serves 1,695,000 people in Phoenix, Arizona. It is a Local-owned system using Surface Water water sources with 430,118 service connections.
What type of violations does Phoenix City Of have? ▼
Phoenix City Of has 84 total violations: 6 health-based violations (MCL exceedances or treatment failures), 76 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Phoenix City Of water? ▼
Yes. UCMR5 testing detected 2 PFAS compounds in Phoenix City Of's water supply: PFBS, PFBA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Phoenix City Of use? ▼
Phoenix City Of 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.