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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400073

Cocopah East

Somerton, EPA Region 9 — Tribal Water Systems 85350 - drinking water served from groundwater sources to 280 people, tracked in EPA SDWIS and UCMR5.

280
People served
166
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 166 drinking-water violations at Cocopah East.

166
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
280
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cocopah East

Cocopah East is a native american-owned community water system that delivers drinking water to 280 residents in Somerton, EPA Region 9 — Tribal Water Systems through 72 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 166 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 80 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 Coliform (TCR), recorded in 17 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 9 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

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
280
Total Violations
166
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
72
School/Daycare
No
MCL Violations
0
Monitoring Violations
80
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 17 2013
Nitrate MR 5 2009
Consumer Confidence Rule Other 5 2006
Lead and Copper Rule MR 4 2011
Barium MR 3 2011
Cadmium MR 3 2011
Chromium MR 3 2011
Mercury MR 3 2011
Selenium MR 3 2011
Antimony, Total MR 3 2011
Beryllium, Total MR 3 2011
Thallium, Total MR 3 2011
CYANIDE MR 3 2011
Revised Total Coliform Rule RPT 3 2025
Arsenic MR 2 2011
Fluoride MR 2 2011
Chlorine MR 2 2024
Diquat MR 1 2004
Endothall MR 1 2004
Glyphosate MR 1 2004
Di(2-ethylhexyl) adipate MR 1 2004
OXAMYL MR 1 2004
Simazine MR 1 2004
Hexachlorocyclopentadiene MR 1 2004
Atrazine MR 1 2004
LASSO MR 1 2004
HEXACHLOROBENZENE MR 1 2004
ETHYLENE DIBROMIDE MR 1 2004
Total Haloacetic Acids (HAA5) MR 1 2009
TTHM MR 1 2009

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 Cocopah East.

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 090400073 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 9 — Tribal Water Systems Drinking Water Authority

EPA Region 9 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 09 regulator via EPA SDWIS

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 RPT 3 SDWIS / 090400073 / 8000
2024 Chlorine MR 2 SDWIS / 090400073 / 0999
2013 Coliform (TCR) MR 17 SDWIS / 090400073 / 3100
2011 Lead and Copper Rule MR 4 SDWIS / 090400073 / 5000
2011 Barium MR 3 SDWIS / 090400073 / 1010
2011 Cadmium MR 3 SDWIS / 090400073 / 1015
2011 Chromium MR 3 SDWIS / 090400073 / 1020
2011 Mercury MR 3 SDWIS / 090400073 / 1035
2011 Selenium MR 3 SDWIS / 090400073 / 1045
2011 Antimony, Total MR 3 SDWIS / 090400073 / 1074
2011 Beryllium, Total MR 3 SDWIS / 090400073 / 1075
2011 Thallium, Total MR 3 SDWIS / 090400073 / 1085
2011 CYANIDE MR 3 SDWIS / 090400073 / 1024
2011 Arsenic MR 2 SDWIS / 090400073 / 1005
2011 Fluoride MR 2 SDWIS / 090400073 / 1025

How Cocopah East Compares

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

Metric Cocopah East EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 166 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 280 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 9 — Tribal Water Systems.

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 Cocopah East water safe to drink? ▼
Cocopah East (PWS ID: 090400073) has 166 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 280 people using Groundwater sources.
How many people does Cocopah East serve? ▼
Cocopah East serves 280 people in Somerton, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 72 service connections.
What type of violations does Cocopah East have? ▼
Cocopah East has 166 total violations: 0 health-based violations (MCL exceedances or treatment failures), 80 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cocopah East water? ▼
No PFAS testing data is available for Cocopah East under the EPA's UCMR5 monitoring program.
What water source does Cocopah East use? ▼
Cocopah East uses Groundwater 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. 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.