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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090600125

Chemehuevi Water

Havasu Lake, EPA Region 9 — Tribal Water Systems 92363 - drinking water served from groundwater sources to 4,400 people, tracked in EPA SDWIS and UCMR5.

4,400
People served
65
EPA violations
9
Health-based
Untested
UCMR5 result

The verdict

EPA records 65 drinking-water violations at Chemehuevi Water, 14% of them health-based.

65
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
4,400
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Chemehuevi Water

Chemehuevi Water is a native american-owned community water system that delivers drinking water to 4,400 residents in Havasu Lake, EPA Region 9 — Tribal Water Systems through 603 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 65 total violations for this system , of which 9 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 27 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 9 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.

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
4,400
Total Violations
65
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
603
School/Daycare
No
MCL Violations
9
Monitoring Violations
27
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 9 1998
Coliform (TCR) MR 7 1996
Nitrate MR 4 2021
TTHM MR 3 2006
Total Haloacetic Acids (HAA5) MR 3 2006
CYANIDE MR 2 1996
Antimony, Total MR 2 1996
Beryllium, Total MR 2 1996
Thallium, Total MR 2 1996
Nitrate-Nitrite MR 1 1996
Consumer Confidence Rule Other 1 2006
Radium-226 MR 1 2002

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 Chemehuevi Water.

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 090600125 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
2021 Nitrate MR 4 SDWIS / 090600125 / 1040
2006 TTHM MR 3 SDWIS / 090600125 / 2950
2006 Total Haloacetic Acids (HAA5) MR 3 SDWIS / 090600125 / 2456
2006 Consumer Confidence Rule Other 1 SDWIS / 090600125 / 7000
2002 Radium-226 MR 1 SDWIS / 090600125 / 4020
1998 Coliform (TCR) MCL 9 SDWIS / 090600125 / 3100
1996 Coliform (TCR) MR 7 SDWIS / 090600125 / 3100
1996 CYANIDE MR 2 SDWIS / 090600125 / 1024
1996 Antimony, Total MR 2 SDWIS / 090600125 / 1074
1996 Beryllium, Total MR 2 SDWIS / 090600125 / 1075
1996 Thallium, Total MR 2 SDWIS / 090600125 / 1085
1996 Nitrate-Nitrite MR 1 SDWIS / 090600125 / 1038

How Chemehuevi Water Compares

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

Metric Chemehuevi Water EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 65 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,400 - 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 Chemehuevi Water water safe to drink? ▼
Chemehuevi Water (PWS ID: 090600125) has 65 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 4,400 people using Groundwater sources.
How many people does Chemehuevi Water serve? ▼
Chemehuevi Water serves 4,400 people in Havasu Lake, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 603 service connections.
What type of violations does Chemehuevi Water have? ▼
Chemehuevi Water has 65 total violations: 9 health-based violations (MCL exceedances or treatment failures), 27 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Chemehuevi Water water? ▼
No PFAS testing data is available for Chemehuevi Water under the EPA's UCMR5 monitoring program.
What water source does Chemehuevi Water use? ▼
Chemehuevi Water 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.