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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400393

Lower Moencopi - Spring Source

Tuba City, EPA Region 9 — Tribal Water Systems 86045 - drinking water served from groundwater sources to 465 people, tracked in EPA SDWIS and UCMR5.

465
People served
367
EPA violations
59
Health-based
Untested
UCMR5 result

The verdict

EPA records 367 drinking-water violations at Lower Moencopi - Spring Source, 16% of them health-based.

367
Total EPA violations on record
16%
Health-based (MCL / treatment failure)
465
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lower Moencopi - Spring Source

Lower Moencopi - Spring Source is a native american-owned community water system that delivers drinking water to 465 residents in Tuba City, EPA Region 9 — Tribal Water Systems through 8 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 367 total violations for this system , of which 59 (16%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 236 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 66 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
465
Total Violations
367
Health-Based Violations
59
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
8
School/Daycare
No
MCL Violations
46
Monitoring Violations
236
Treatment Tech Violations
13

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 66 2016
Coliform (TCR) MCL 46 2003
Groundwater Rule TT 13 2023
Nitrate MR 7 2024
Public Notice Other 5 2023
Arsenic MR 3 2001
Barium MR 3 2001
Cadmium MR 3 2001
Fluoride MR 3 2001
Mercury MR 3 2001
Chromium MR 3 2001
Selenium MR 3 2001
BHC-GAMMA MR 3 2001
Methoxychlor MR 3 2001
Toxaphene MR 3 2001
Carbofuran MR 3 2001
LASSO MR 3 2001
Heptachlor MR 3 2001
2,4-D MR 3 2001
2,4,5-TP MR 3 2001
Pentachlorophenol MR 3 2001
1,2,4-Trichlorobenzene MR 3 2001
cis-1,2-Dichloroethylene MR 3 2001
Total Polychlorinated Biphenyls (PCB) MR 3 2001
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2001
ETHYLENE DIBROMIDE MR 3 2001
Xylenes, Total MR 3 2001
Chlordane MR 3 2001
DICHLOROMETHANE MR 3 2001
o-Dichlorobenzene MR 3 2001

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 Lower Moencopi - Spring Source.

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 090400393 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 3 SDWIS / 090400393 / 0999
2024 Nitrate MR 7 SDWIS / 090400393 / 1040
2024 Total Haloacetic Acids (HAA5) MR 3 SDWIS / 090400393 / 2456
2024 TTHM MR 3 SDWIS / 090400393 / 2950
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / 090400393 / 5200
2023 Groundwater Rule TT 13 SDWIS / 090400393 / 0700
2023 Public Notice Other 5 SDWIS / 090400393 / 7500
2016 Coliform (TCR) MR 66 SDWIS / 090400393 / 3100
2014 Consumer Confidence Rule Other 3 SDWIS / 090400393 / 7000
2003 Coliform (TCR) MCL 46 SDWIS / 090400393 / 3100
2001 Arsenic MR 3 SDWIS / 090400393 / 1005
2001 Barium MR 3 SDWIS / 090400393 / 1010
2001 Cadmium MR 3 SDWIS / 090400393 / 1015
2001 Fluoride MR 3 SDWIS / 090400393 / 1025
2001 Mercury MR 3 SDWIS / 090400393 / 1035

How Lower Moencopi - Spring Source Compares

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

Metric Lower Moencopi - Spring Source EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 367 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 59 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 465 - 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 Lower Moencopi - Spring Source water safe to drink? ▼
Lower Moencopi - Spring Source (PWS ID: 090400393) has 367 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 465 people using Groundwater sources.
How many people does Lower Moencopi - Spring Source serve? ▼
Lower Moencopi - Spring Source serves 465 people in Tuba City, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 8 service connections.
What type of violations does Lower Moencopi - Spring Source have? ▼
Lower Moencopi - Spring Source has 367 total violations: 59 health-based violations (MCL exceedances or treatment failures), 236 monitoring/reporting violations, and 13 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lower Moencopi - Spring Source water? ▼
No PFAS testing data is available for Lower Moencopi - Spring Source under the EPA's UCMR5 monitoring program.
What water source does Lower Moencopi - Spring Source use? ▼
Lower Moencopi - Spring Source 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.