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Non-Transient Non-Community Water System · PWS AZ0414363

Walker Cantonment Area

Yuma, Arizona 85365 - drinking water served from groundwater sources to 888 people, tracked in EPA SDWIS and UCMR5.

888
People served
295
EPA violations
32
Health-based
Untested
UCMR5 result

The verdict

EPA records 295 drinking-water violations at Walker Cantonment Area, 11% of them health-based - above the Arizona per-system average.

295
Total EPA violations on record
11%
Health-based (MCL / treatment failure)
888
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Walker Cantonment Area

Walker Cantonment Area is a federal-owned non-transient non-community water system that delivers drinking water to 888 residents in Yuma, Arizona (Yuma County) through 102 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 295 total violations for this system , of which 32 (11%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 237 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Chlorine, recorded in 33 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%).

Walker Cantonment Area's 295 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
888
Total Violations
295
Health-Based Violations
32
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Federal
Connections
102
County
Yuma
School/Daycare
No
MCL Violations
32
Monitoring Violations
237
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 33 2016
Arsenic MCL 31 2011
Arsenic MR 22 2012
Xylenes, Total MR 21 2003
Nitrate MR 11 2012
Coliform (TCR) MR 10 2014
Dalapon MR 6 2022
Cadmium MR 3 2010
Selenium MR 3 2010
Barium MR 3 2010
Toxaphene MR 3 2010
Diquat MR 3 2010
Glyphosate MR 3 2010
Di(2-ethylhexyl) adipate MR 3 2010
OXAMYL MR 3 2010
Simazine MR 3 2010
Di(2-ethylhexyl) phthalate MR 3 2010
Picloram MR 3 2010
Hexachlorocyclopentadiene MR 3 2010
Atrazine MR 3 2010
2,4,5-TP MR 3 2010
HEXACHLOROBENZENE MR 3 2010
Pentachlorophenol MR 3 2010
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2010
ETHYLENE DIBROMIDE MR 3 2010
Chlordane MR 3 2010
Endrin MR 3 2010
BHC-GAMMA MR 3 2010
Endothall MR 3 2010
Dinoseb MR 3 2010

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 Walker Cantonment Area.

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 AZ0414363 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 Walker Cantonment Area 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
2022 Dalapon MR 6 SDWIS / AZ0414363 / 2031
2017 Lead and Copper Rule MR 1 SDWIS / AZ0414363 / 5000
2016 Chlorine MR 33 SDWIS / AZ0414363 / 0999
2014 Coliform (TCR) MR 10 SDWIS / AZ0414363 / 3100
2012 Arsenic MR 22 SDWIS / AZ0414363 / 1005
2012 Nitrate MR 11 SDWIS / AZ0414363 / 1040
2011 Arsenic MCL 31 SDWIS / AZ0414363 / 1005
2010 Cadmium MR 3 SDWIS / AZ0414363 / 1015
2010 Selenium MR 3 SDWIS / AZ0414363 / 1045
2010 Barium MR 3 SDWIS / AZ0414363 / 1010
2010 Toxaphene MR 3 SDWIS / AZ0414363 / 2020
2010 Diquat MR 3 SDWIS / AZ0414363 / 2032
2010 Glyphosate MR 3 SDWIS / AZ0414363 / 2034
2010 Di(2-ethylhexyl) adipate MR 3 SDWIS / AZ0414363 / 2035
2010 OXAMYL MR 3 SDWIS / AZ0414363 / 2036

How Walker Cantonment Area Compares

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

Metric Walker Cantonment Area Arizona avg Federal benchmark
Total violations 295 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 32 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 888 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 Walker Cantonment Area water safe to drink? ▼
Walker Cantonment Area (PWS ID: AZ0414363) has 295 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 888 people using Groundwater sources.
How many people does Walker Cantonment Area serve? ▼
Walker Cantonment Area serves 888 people in Yuma, Arizona. It is a Federal-owned system using Groundwater water sources with 102 service connections.
What type of violations does Walker Cantonment Area have? ▼
Walker Cantonment Area has 295 total violations: 32 health-based violations (MCL exceedances or treatment failures), 237 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Walker Cantonment Area water? ▼
No PFAS testing data is available for Walker Cantonment Area under the EPA's UCMR5 monitoring program.
What water source does Walker Cantonment Area use? ▼
Walker Cantonment Area uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.