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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 093534001

Eastern Navajo Agency - BIE

Washington, EPA Region 9 — Tribal Water Systems 20240 - drinking water served from groundwater sources to 455 people, tracked in EPA SDWIS and UCMR5.

455
People served
112
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 112 drinking-water violations at Eastern Navajo Agency - BIE, 1% of them health-based.

112
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
455
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Eastern Navajo Agency - BIE

Eastern Navajo Agency - BIE is a federal-owned community water system that delivers drinking water to 455 residents in Washington, EPA Region 9 — Tribal Water Systems through 30 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 112 total violations for this system , of which 1 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 93 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 Gross Beta Particle Activity, recorded in 13 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
455
Total Violations
112
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Federal
Connections
30
School/Daycare
No
MCL Violations
0
Monitoring Violations
93
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Beta Particle Activity MR 13 2017
Consumer Confidence Rule Other 6 2023
Combined Uranium MR 6 2025
Coliform (TCR) MR 3 2002
Gross Alpha, Excl. Radon and U MR 3 2025
Nitrate MR 2 2004
Endothall MR 2 2004
Picloram MR 2 2004
Dinoseb MR 2 2004
Carbofuran MR 2 2004
Pentachlorophenol MR 2 2004
Total Polychlorinated Biphenyls (PCB) MR 2 2004
Lead and Copper Rule MR 2 2022
Dalapon MR 2 2004
Glyphosate MR 2 2004
OXAMYL MR 2 2004
2,4-D MR 2 2004
Diquat MR 2 2004
2,4,5-TP MR 2 2004
CYANIDE MR 1 2001
Endrin MR 1 2004
BHC-GAMMA MR 1 2004
Methoxychlor MR 1 2004
Toxaphene MR 1 2004
Simazine MR 1 2004
Di(2-ethylhexyl) phthalate MR 1 2004
Hexachlorocyclopentadiene MR 1 2004
Atrazine MR 1 2004
2,3,7,8-TCDD MR 1 2001
Heptachlor MR 1 2004

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 Eastern Navajo Agency - BIE.

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 093534001 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 Combined Uranium MR 6 SDWIS / 093534001 / 4006
2025 Gross Alpha, Excl. Radon and U MR 3 SDWIS / 093534001 / 4000
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / 093534001 / 5200
2023 Consumer Confidence Rule Other 6 SDWIS / 093534001 / 7000
2022 Lead and Copper Rule MR 2 SDWIS / 093534001 / 5000
2017 Gross Beta Particle Activity MR 13 SDWIS / 093534001 / 4100
2004 Nitrate MR 2 SDWIS / 093534001 / 1040
2004 Endothall MR 2 SDWIS / 093534001 / 2033
2004 Picloram MR 2 SDWIS / 093534001 / 2040
2004 Dinoseb MR 2 SDWIS / 093534001 / 2041
2004 Carbofuran MR 2 SDWIS / 093534001 / 2046
2004 Pentachlorophenol MR 2 SDWIS / 093534001 / 2326
2004 Total Polychlorinated Biphenyls (PCB) MR 2 SDWIS / 093534001 / 2383
2004 Dalapon MR 2 SDWIS / 093534001 / 2031
2004 Glyphosate MR 2 SDWIS / 093534001 / 2034

How Eastern Navajo Agency - BIE Compares

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

Metric Eastern Navajo Agency - BIE EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 112 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 455 - 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 Eastern Navajo Agency - BIE water safe to drink? ▼
Eastern Navajo Agency - BIE (PWS ID: 093534001) has 112 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 455 people using Groundwater sources.
How many people does Eastern Navajo Agency - BIE serve? ▼
Eastern Navajo Agency - BIE serves 455 people in Washington, EPA Region 9 — Tribal Water Systems. It is a Federal-owned system using Groundwater water sources with 30 service connections.
What type of violations does Eastern Navajo Agency - BIE have? ▼
Eastern Navajo Agency - BIE has 112 total violations: 1 health-based violations (MCL exceedances or treatment failures), 93 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Eastern Navajo Agency - BIE water? ▼
No PFAS testing data is available for Eastern Navajo Agency - BIE under the EPA's UCMR5 monitoring program.
What water source does Eastern Navajo Agency - BIE use? ▼
Eastern Navajo Agency - BIE 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.