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Non-Transient Non-Community Water System · PWS AZ0414367

Kofa Cantonment Area

Yuma, Arizona 85365 - drinking water served from groundwater sources to 390 people, tracked in EPA SDWIS and UCMR5.

390
People served
236
EPA violations
72
Health-based
Untested
UCMR5 result

The verdict

EPA records 236 drinking-water violations at Kofa Cantonment Area, 31% of them health-based - above the Arizona per-system average.

236
Total EPA violations on record
31%
Health-based (MCL / treatment failure)
390
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Kofa Cantonment Area

Kofa Cantonment Area is a federal-owned non-transient non-community water system that delivers drinking water to 390 residents in Yuma, Arizona (Yuma County) through 64 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 236 total violations for this system , of which 72 (31%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 153 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Arsenic, recorded in 64 violations (MCL, health-based). 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%).

Kofa Cantonment Area's 236 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
390
Total Violations
236
Health-Based Violations
72
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Federal
Connections
64
County
Yuma
School/Daycare
No
MCL Violations
72
Monitoring Violations
153
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 64 2011
Arsenic MR 31 2012
Chlorine MR 18 2016
Coliform (TCR) MR 11 2012
Nitrate MR 8 2012
Coliform (TCR) MCL 6 2013
TTHM MR 6 2012
Total Haloacetic Acids (HAA5) MR 6 2012
Lead and Copper Rule MR 4 2017
2,3,7,8-TCDD MR 4 2011
Nickel MR 2 2011
Diquat MR 2 2011
Endothall MR 2 2011
Glyphosate MR 2 2011
Di(2-ethylhexyl) adipate MR 2 2011
OXAMYL MR 2 2011
Picloram MR 2 2011
Hexachlorocyclopentadiene MR 2 2011
Atrazine MR 2 2011
LASSO MR 2 2011
Heptachlor MR 2 2011
2,4-D MR 2 2011
HEXACHLOROBENZENE MR 2 2011
Benzo(a)pyrene MR 2 2011
Pentachlorophenol MR 2 2011
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2011
ETHYLENE DIBROMIDE MR 2 2011
Chlordane MR 2 2011
Endrin MR 2 2011
Methoxychlor MR 2 2011

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 Kofa 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 AZ0414367 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 Kofa 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
2017 Lead and Copper Rule MR 4 SDWIS / AZ0414367 / 5000
2016 Chlorine MR 18 SDWIS / AZ0414367 / 0999
2014 TTHM MCL 1 SDWIS / AZ0414367 / 2950
2013 Coliform (TCR) MCL 6 SDWIS / AZ0414367 / 3100
2012 Arsenic MR 31 SDWIS / AZ0414367 / 1005
2012 Coliform (TCR) MR 11 SDWIS / AZ0414367 / 3100
2012 Nitrate MR 8 SDWIS / AZ0414367 / 1040
2012 TTHM MR 6 SDWIS / AZ0414367 / 2950
2012 Total Haloacetic Acids (HAA5) MR 6 SDWIS / AZ0414367 / 2456
2011 Arsenic MCL 64 SDWIS / AZ0414367 / 1005
2011 2,3,7,8-TCDD MR 4 SDWIS / AZ0414367 / 2063
2011 Nickel MR 2 SDWIS / AZ0414367 / 1036
2011 Diquat MR 2 SDWIS / AZ0414367 / 2032
2011 Endothall MR 2 SDWIS / AZ0414367 / 2033
2011 Glyphosate MR 2 SDWIS / AZ0414367 / 2034

How Kofa Cantonment Area Compares

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

Metric Kofa Cantonment Area Arizona avg Federal benchmark
Total violations 236 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 72 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 390 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 Kofa Cantonment Area water safe to drink? ▼
Kofa Cantonment Area (PWS ID: AZ0414367) has 236 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 390 people using Groundwater sources.
How many people does Kofa Cantonment Area serve? ▼
Kofa Cantonment Area serves 390 people in Yuma, Arizona. It is a Federal-owned system using Groundwater water sources with 64 service connections.
What type of violations does Kofa Cantonment Area have? ▼
Kofa Cantonment Area has 236 total violations: 72 health-based violations (MCL exceedances or treatment failures), 153 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Kofa Cantonment Area water? ▼
No PFAS testing data is available for Kofa Cantonment Area under the EPA's UCMR5 monitoring program.
What water source does Kofa Cantonment Area use? ▼
Kofa 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.