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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400301

Mesquite Creek

Needles, EPA Region 9 — Tribal Water Systems 92363 - drinking water served from groundwater sources to 650 people, tracked in EPA SDWIS and UCMR5.

650
People served
127
EPA violations
9
Health-based
Untested
UCMR5 result

The verdict

EPA records 127 drinking-water violations at Mesquite Creek, 7% of them health-based.

127
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
650
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mesquite Creek

Mesquite Creek is a native american-owned community water system that delivers drinking water to 650 residents in Needles, EPA Region 9 — Tribal Water Systems through 270 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 127 total violations for this system , of which 9 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 64 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 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
650
Total Violations
127
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
270
School/Daycare
No
MCL Violations
9
Monitoring Violations
64
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 9 2008
Chlorine MR 5 2025
Total Haloacetic Acids (HAA5) MR 5 2023
TTHM MR 4 2010
Consumer Confidence Rule Other 4 2023
Coliform (TCR) MR 3 2010
2,3,7,8-TCDD MR 2 2001
Revised Total Coliform Rule RPT 2 2024
Lead and Copper Rule MR 2 2023
Barium MR 1 1998
Chromium MR 1 1998
CYANIDE MR 1 1998
Fluoride MR 1 1998
Beryllium, Total MR 1 1998
Mercury MR 1 1998
Nitrate MR 1 1998
Selenium MR 1 1998
Thallium, Total MR 1 1998
Endrin MR 1 1998
BHC-GAMMA MR 1 1998
Methoxychlor MR 1 1998
Toxaphene MR 1 1998
Glyphosate MR 1 1998
OXAMYL MR 1 1998
Simazine MR 1 1998
Di(2-ethylhexyl) phthalate MR 1 1998
Hexachlorocyclopentadiene MR 1 1998
Carbofuran MR 1 1998
Heptachlor MR 1 1998
2,4-D MR 1 1998

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 Mesquite Creek.

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 090400301 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 Chlorine MR 5 SDWIS / 090400301 / 0999
2024 Revised Total Coliform Rule RPT 2 SDWIS / 090400301 / 8000
2024 Revised Total Coliform Rule MON 1 SDWIS / 090400301 / 8000
2023 Total Haloacetic Acids (HAA5) MR 5 SDWIS / 090400301 / 2456
2023 Consumer Confidence Rule Other 4 SDWIS / 090400301 / 7000
2023 Lead and Copper Rule MR 2 SDWIS / 090400301 / 5000
2010 TTHM MR 4 SDWIS / 090400301 / 2950
2010 Coliform (TCR) MR 3 SDWIS / 090400301 / 3100
2008 Coliform (TCR) MCL 9 SDWIS / 090400301 / 3100
2004 Radium-226 MR 1 SDWIS / 090400301 / 4020
2001 2,3,7,8-TCDD MR 2 SDWIS / 090400301 / 2063
1998 Barium MR 1 SDWIS / 090400301 / 1010
1998 Chromium MR 1 SDWIS / 090400301 / 1020
1998 CYANIDE MR 1 SDWIS / 090400301 / 1024
1998 Fluoride MR 1 SDWIS / 090400301 / 1025

How Mesquite Creek Compares

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

Metric Mesquite Creek EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 127 - 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 650 - 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 Mesquite Creek water safe to drink? ▼
Mesquite Creek (PWS ID: 090400301) has 127 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 650 people using Groundwater sources.
How many people does Mesquite Creek serve? ▼
Mesquite Creek serves 650 people in Needles, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 270 service connections.
What type of violations does Mesquite Creek have? ▼
Mesquite Creek has 127 total violations: 9 health-based violations (MCL exceedances or treatment failures), 64 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mesquite Creek water? ▼
No PFAS testing data is available for Mesquite Creek under the EPA's UCMR5 monitoring program.
What water source does Mesquite Creek use? ▼
Mesquite Creek 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.