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States → Navajo Nation

Community Water System · PWS NN4903074

Casa Del Eco Mesa NTUA

Ft Defiance, Navajo Nation 86504 - drinking water served from groundwater sources to 211 people, tracked in EPA SDWIS and UCMR5.

211
People served
139
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 139 drinking-water violations at Casa Del Eco Mesa NTUA - below the Navajo Nation per-system average.

139
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
211
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Casa Del Eco Mesa NTUA

Casa Del Eco Mesa NTUA is a native american-owned community water system that delivers drinking water to 211 residents in Ft Defiance, Navajo Nation through 55 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 139 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 130 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is 1,2,4-Trichlorobenzene, recorded in 4 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Navajo Nation, EPA tracks 170 public water systems serving 167,275 people, with 29,535 cumulative violations and 1,366 health-based violations on record. About 100% of systems in the state carry at least one violation, and state-wide the average per system is 173.7 violations. Statewide, 13 of 13 UCMR5-tested systems have reported PFAS detections (100%).

Casa Del Eco Mesa NTUA's 139 violations sit below the Navajo Nation average.

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
211
Total Violations
139
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
55
School/Daycare
No
MCL Violations
0
Monitoring Violations
130
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 4 2011
cis-1,2-Dichloroethylene MR 4 2011
1,2-DIBROMO-3-CHLOROPROPANE MR 4 2011
ETHYLENE DIBROMIDE MR 4 2011
DICHLOROMETHANE MR 4 2011
o-Dichlorobenzene MR 4 2011
trans-1,2-Dichloroethylene MR 4 2011
1,2-Dichloroethane MR 4 2011
1,1,1-Trichloroethane MR 4 2011
Carbon tetrachloride MR 4 2011
1,2-Dichloropropane MR 4 2011
Trichloroethylene MR 4 2011
1,1,2-Trichloroethane MR 4 2011
Tetrachloroethylene MR 4 2011
CHLOROBENZENE MR 4 2011
Toluene MR 4 2011
Ethylbenzene MR 4 2011
Styrene MR 4 2011
Xylenes, Total MR 4 2011
1,1-Dichloroethylene MR 4 2011
p-Dichlorobenzene MR 4 2011
Benzene MR 4 2011
Vinyl chloride MR 4 2011
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 2013
Total Polychlorinated Biphenyls (PCB) MR 3 2011
Coliform (TCR) MR 3 2012
Revised Total Coliform Rule Other 2 2016
Endrin MR 1 2011
BHC-GAMMA MR 1 2011
Glyphosate MR 1 2011

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 Casa Del Eco Mesa NTUA.

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 NN4903074 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Navajo Nation Drinking Water Authority

Navajo Nation'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 NN 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
2016 Revised Total Coliform Rule Other 2 SDWIS / NN4903074 / 8000
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 SDWIS / NN4903074 / 0600
2012 Coliform (TCR) MR 3 SDWIS / NN4903074 / 3100
2011 1,2,4-Trichlorobenzene MR 4 SDWIS / NN4903074 / 2378
2011 cis-1,2-Dichloroethylene MR 4 SDWIS / NN4903074 / 2380
2011 1,2-DIBROMO-3-CHLOROPROPANE MR 4 SDWIS / NN4903074 / 2931
2011 ETHYLENE DIBROMIDE MR 4 SDWIS / NN4903074 / 2946
2011 DICHLOROMETHANE MR 4 SDWIS / NN4903074 / 2964
2011 o-Dichlorobenzene MR 4 SDWIS / NN4903074 / 2968
2011 trans-1,2-Dichloroethylene MR 4 SDWIS / NN4903074 / 2979
2011 1,2-Dichloroethane MR 4 SDWIS / NN4903074 / 2980
2011 1,1,1-Trichloroethane MR 4 SDWIS / NN4903074 / 2981
2011 Carbon tetrachloride MR 4 SDWIS / NN4903074 / 2982
2011 1,2-Dichloropropane MR 4 SDWIS / NN4903074 / 2983
2011 Trichloroethylene MR 4 SDWIS / NN4903074 / 2984

How Casa Del Eco Mesa NTUA Compares

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

Metric Casa Del Eco Mesa NTUA Navajo Nation avg Federal benchmark
Total violations 139 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 211 984 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 170 regulated public water systems in Navajo Nation.

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 Casa Del Eco Mesa NTUA water safe to drink? ▼
Casa Del Eco Mesa NTUA (PWS ID: NN4903074) has 139 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 211 people using Groundwater sources.
How many people does Casa Del Eco Mesa NTUA serve? ▼
Casa Del Eco Mesa NTUA serves 211 people in Ft Defiance, Navajo Nation. It is a Native American-owned system using Groundwater water sources with 55 service connections.
What type of violations does Casa Del Eco Mesa NTUA have? ▼
Casa Del Eco Mesa NTUA has 139 total violations: 0 health-based violations (MCL exceedances or treatment failures), 130 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Casa Del Eco Mesa NTUA water? ▼
No PFAS testing data is available for Casa Del Eco Mesa NTUA under the EPA's UCMR5 monitoring program.
What water source does Casa Del Eco Mesa NTUA use? ▼
Casa Del Eco Mesa NTUA 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.