Lukachukai NTUA
PWS ID: NN0403047 · Ft Defiance, Navajo Nation 86504
Lukachukai NTUA serves 1,659 people in Ft Defiance, Navajo Nation using Groundwater water sources. It has 80 recorded EPA violations, including 18 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: Lukachukai NTUA
Lukachukai NTUA is a native american-owned community water system that delivers drinking water to 1,659 residents in Ft Defiance, Navajo Nation through 485 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 80 total violations for this system , of which 18 (23%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 39 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.
The most frequently cited contaminant at this system is Arsenic, recorded in 18 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.
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. Lukachukai NTUA's 80 violations sit below the Navajo Nation average. Statewide, 13 of 13 UCMR5-tested systems have reported PFAS detections (100%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 485
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 39
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 18 | 2012 |
| Coliform (TCR) | MR | 6 | 2012 |
| TTHM | MR | 3 | 2020 |
| Arsenic | MR | 3 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2020 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 2 | 2013 |
| Revised Total Coliform Rule | Other | 2 | 2016 |
| Nitrite | MR | 1 | 2010 |
| cis-1,2-Dichloroethylene | MR | 1 | 2005 |
| Xylenes, Total | MR | 1 | 2005 |
| DICHLOROMETHANE | MR | 1 | 2005 |
| o-Dichlorobenzene | MR | 1 | 2005 |
| 1,1-Dichloroethylene | MR | 1 | 2005 |
| 1,1,1-Trichloroethane | MR | 1 | 2005 |
| 1,2-Dichloropropane | MR | 1 | 2005 |
| Trichloroethylene | MR | 1 | 2005 |
| 1,1,2-Trichloroethane | MR | 1 | 2005 |
| Tetrachloroethylene | MR | 1 | 2005 |
| Benzene | MR | 1 | 2005 |
| Toluene | MR | 1 | 2005 |
| 1,2-Dichloroethane | MR | 1 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2005 |
| Carbon tetrachloride | MR | 1 | 2005 |
| CHLOROBENZENE | MR | 1 | 2005 |
| Ethylbenzene | MR | 1 | 2005 |
| trans-1,2-Dichloroethylene | MR | 1 | 2005 |
| p-Dichlorobenzene | MR | 1 | 2005 |
| Vinyl chloride | MR | 1 | 2005 |
| Styrene | MR | 1 | 2005 |
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 Lukachukai NTUA.
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 NN0403047 on SDWISSource: EPA SDWIS Federal Reports Search
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 SDWISViolation 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 |
|---|---|---|---|---|
| 2020 | TTHM | MR | 3 | SDWIS / NN0403047 / 2950 |
| 2020 | Total Haloacetic Acids (HAA5) | MR | 3 | SDWIS / NN0403047 / 2456 |
| 2016 | Revised Total Coliform Rule | Other | 2 | SDWIS / NN0403047 / 8000 |
| 2013 | Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 2 | SDWIS / NN0403047 / 0600 |
| 2012 | Arsenic | MCL | 18 | SDWIS / NN0403047 / 1005 |
| 2012 | Coliform (TCR) | MR | 6 | SDWIS / NN0403047 / 3100 |
| 2012 | Arsenic | MR | 3 | SDWIS / NN0403047 / 1005 |
| 2010 | Nitrite | MR | 1 | SDWIS / NN0403047 / 1041 |
| 2005 | cis-1,2-Dichloroethylene | MR | 1 | SDWIS / NN0403047 / 2380 |
| 2005 | Xylenes, Total | MR | 1 | SDWIS / NN0403047 / 2955 |
| 2005 | DICHLOROMETHANE | MR | 1 | SDWIS / NN0403047 / 2964 |
| 2005 | o-Dichlorobenzene | MR | 1 | SDWIS / NN0403047 / 2968 |
| 2005 | 1,1-Dichloroethylene | MR | 1 | SDWIS / NN0403047 / 2977 |
| 2005 | 1,1,1-Trichloroethane | MR | 1 | SDWIS / NN0403047 / 2981 |
| 2005 | 1,2-Dichloropropane | MR | 1 | SDWIS / NN0403047 / 2983 |
How Lukachukai NTUA Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Lukachukai NTUA | Navajo Nation avg | Federal benchmark |
|---|---|---|---|
| Total violations | 80 | 173.7 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 18 | 8 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 100% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 1,659 | 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 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
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Related Data for Navajo Nation
Read our methodology — how this data is sourced, computed, and verified.