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Community Water System · PWS AZ0414024

City of Yuma

Yuma, Arizona 85364 - drinking water served from surface water sources to 103,264 people, tracked in EPA SDWIS and UCMR5.

103,264
People served
456
EPA violations
93
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 456 drinking-water violations at City of Yuma, 20% of them health-based - above the Arizona per-system average.

456
Total EPA violations on record
20%
Health-based (MCL / treatment failure)
103,264
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: City of Yuma

City of Yuma is a local-owned community water system that delivers drinking water to 103,264 residents in Yuma, Arizona (Yuma County) through 32,641 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 456 total violations for this system , of which 93 (20%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 308 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 Chlorine dioxide, recorded in 88 violations (MRDL, health-based). 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%).

City of Yuma's 456 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
103,264
Total Violations
456
Health-Based Violations
93
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
32,641
County
Yuma
School/Daycare
No
MCL Violations
1
Monitoring Violations
308
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine dioxide MRDL 88 2022
Chlorite MR 68 2024
Chlorine dioxide MR 67 2025
Public Notice Other 42 2022
Nitrate MR 19 2005
DICHLOROMETHANE MR 19 2008
Interim Enhanced Surface Water Treatment Rule MR 8 2018
Coliform (TCR) MR 7 2003
1,2,4-Trichlorobenzene MR 4 2008
cis-1,2-Dichloroethylene MR 4 2008
p-Dichlorobenzene MR 4 2008
1,1,1-Trichloroethane MR 4 2008
Carbon tetrachloride MR 4 2008
1,2-Dichloropropane MR 4 2008
1,1,2-Trichloroethane MR 4 2008
Tetrachloroethylene MR 4 2008
Styrene MR 4 2008
Xylenes, Total MR 4 2008
o-Dichlorobenzene MR 4 2008
1,2-Dichloroethane MR 4 2008
Trichloroethylene MR 4 2008
Toluene MR 4 2008
Ethylbenzene MR 4 2008
1,1-Dichloroethylene MR 4 2008
Benzene MR 4 2008
Selenium MR 4 1989
Mercury MR 4 1989
Fluoride MR 4 1989
Cadmium MR 4 1989
Arsenic MR 4 1988

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 232 samples detected PFAS.

Contaminant Date Result MRL Status
PFMBA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 8/15/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 8/15/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 8/15/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/15/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 8/15/2023 <4.00 ppt 4.00 ppt Not Detected
HFPO-DA 8/15/2023 <5.00 ppt 5.00 ppt Not Detected
11Cl-PF3OUdS 8/15/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 8/15/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 8/15/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 8/15/2023 <4.00 ppt 4.00 ppt Not Detected
ADONA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/15/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 8/15/2023 <2.00 ppt 2.00 ppt Not Detected
NFDHA 8/15/2023 <20.00 ppt 20.00 ppt Not Detected
PFHxS 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 8/15/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 7/11/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 7/11/2023 <6.00 ppt 6.00 ppt Not Detected
PFTA 7/11/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/11/2023 <2.00 ppt 2.00 ppt Not Detected
PFPeS 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 7/11/2023 <2.00 ppt 2.00 ppt Not Detected
NFDHA 7/11/2023 <20.00 ppt 20.00 ppt Not Detected
PFTA 7/11/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/11/2023 <7.00 ppt 7.00 ppt Not Detected
NMeFOSAA 7/11/2023 <6.00 ppt 6.00 ppt Not Detected
PFOA 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
NEtFOSAA 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/11/2023 <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 City of Yuma.

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 AZ0414024 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 City of Yuma 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 Chlorine dioxide MR 67 SDWIS / AZ0414024 / 1008
2024 Chlorite MR 68 SDWIS / AZ0414024 / 1009
2022 Chlorine dioxide MRDL 88 SDWIS / AZ0414024 / 1008
2022 Public Notice Other 42 SDWIS / AZ0414024 / 7500
2021 CARBON, TOTAL TT 4 SDWIS / AZ0414024 / 2920
2018 Interim Enhanced Surface Water Treatment Rule MR 8 SDWIS / AZ0414024 / 0300
2018 Surface Water Treatment Rule MR 1 SDWIS / AZ0414024 / 0200
2008 DICHLOROMETHANE MR 19 SDWIS / AZ0414024 / 2964
2008 1,2,4-Trichlorobenzene MR 4 SDWIS / AZ0414024 / 2378
2008 cis-1,2-Dichloroethylene MR 4 SDWIS / AZ0414024 / 2380
2008 p-Dichlorobenzene MR 4 SDWIS / AZ0414024 / 2969
2008 1,1,1-Trichloroethane MR 4 SDWIS / AZ0414024 / 2981
2008 Carbon tetrachloride MR 4 SDWIS / AZ0414024 / 2982
2008 1,2-Dichloropropane MR 4 SDWIS / AZ0414024 / 2983
2008 1,1,2-Trichloroethane MR 4 SDWIS / AZ0414024 / 2985

How City of Yuma Compares

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

Metric City of Yuma Arizona avg Federal benchmark
Total violations 456 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 93 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 103,264 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 City of Yuma water safe to drink? ▼
City of Yuma (PWS ID: AZ0414024) has 456 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 103,264 people using Surface Water sources.
How many people does City of Yuma serve? ▼
City of Yuma serves 103,264 people in Yuma, Arizona. It is a Local-owned system using Surface Water water sources with 32,641 service connections.
What type of violations does City of Yuma have? ▼
City of Yuma has 456 total violations: 93 health-based violations (MCL exceedances or treatment failures), 308 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in City of Yuma water? ▼
No. City of Yuma was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does City of Yuma use? ▼
City of Yuma 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.