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States → Navajo Nation

Community Water System · PWS NN0403003

Kayenta NTUA

Ft Defiance, Navajo Nation 86504 - drinking water served from groundwater sources to 3,844 people, tracked in EPA SDWIS and UCMR5.

3,844
People served
258
EPA violations
0
Health-based
1 PFAS
UCMR5 result

The verdict

EPA records 258 drinking-water violations at Kayenta NTUA - above the Navajo Nation per-system average, and UCMR5 testing detected 1 PFAS compound.

258
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
3,844
People served by this system
1
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Kayenta NTUA

Kayenta NTUA is a native american-owned community water system that delivers drinking water to 3,844 residents in Ft Defiance, Navajo Nation through 1,134 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 258 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 244 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 9 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 5.1 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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%).

Kayenta NTUA's 258 violations sit above 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.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
3,844
Total Violations
258
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
1,134
School/Daycare
No
MCL Violations
0
Monitoring Violations
244
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 9 2012
Diquat MR 6 2017
Endothall MR 6 2017
Glyphosate MR 6 2017
2,3,7,8-TCDD MR 6 2017
Total Polychlorinated Biphenyls (PCB) MR 6 2017
1,2-DIBROMO-3-CHLOROPROPANE MR 6 2017
ETHYLENE DIBROMIDE MR 6 2017
Nitrate MR 5 2024
Gross Alpha, Excl. Radon and U MR 5 2017
CYANIDE MR 4 2011
1,2,4-Trichlorobenzene MR 4 2017
cis-1,2-Dichloroethylene MR 4 2017
DICHLOROMETHANE MR 4 2017
o-Dichlorobenzene MR 4 2017
1,1-Dichloroethylene MR 4 2017
trans-1,2-Dichloroethylene MR 4 2017
1,2-Dichloroethane MR 4 2017
1,1,1-Trichloroethane MR 4 2017
1,2-Dichloropropane MR 4 2017
1,1,2-Trichloroethane MR 4 2017
Tetrachloroethylene MR 4 2017
CHLOROBENZENE MR 4 2017
Benzene MR 4 2017
Toluene MR 4 2017
Ethylbenzene MR 4 2017
Styrene MR 4 2017
Combined Uranium MR 4 2017
Combined Radium (-226 and -228) MR 4 2017
Trichloroethylene MR 4 2017

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 406 samples detected PFAS.

Contaminant Date Result MRL Status
PFMBA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFBS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/13/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
NFDHA 9/13/2023 <20.00 ppt 20.00 ppt Not Detected
ADONA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/13/2023 <8.00 ppt 8.00 ppt Not Detected
PFBA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/13/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/13/2023 <7.00 ppt 7.00 ppt Not Detected
9Cl-PF3ONS 9/13/2023 <2.00 ppt 2.00 ppt Not Detected
PFPeS 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFUnA 9/13/2023 <2.00 ppt 2.00 ppt Not Detected
PFEESA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/13/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 9/13/2023 <8.00 ppt 8.00 ppt Not Detected
NMeFOSAA 9/13/2023 <6.00 ppt 6.00 ppt Not Detected
PFDoA 9/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 9/13/2023 <7.00 ppt 7.00 ppt Not Detected
PFBA 9/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 9/13/2023 <3.00 ppt 3.00 ppt Not Detected

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 Kayenta 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 NN0403003 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
2024 Nitrate MR 5 SDWIS / NN0403003 / 1040
2024 Nitrite MR 3 SDWIS / NN0403003 / 1041
2020 TTHM MR 3 SDWIS / NN0403003 / 2950
2020 Total Haloacetic Acids (HAA5) MR 3 SDWIS / NN0403003 / 2456
2017 Diquat MR 6 SDWIS / NN0403003 / 2032
2017 Endothall MR 6 SDWIS / NN0403003 / 2033
2017 Glyphosate MR 6 SDWIS / NN0403003 / 2034
2017 2,3,7,8-TCDD MR 6 SDWIS / NN0403003 / 2063
2017 Total Polychlorinated Biphenyls (PCB) MR 6 SDWIS / NN0403003 / 2383
2017 1,2-DIBROMO-3-CHLOROPROPANE MR 6 SDWIS / NN0403003 / 2931
2017 ETHYLENE DIBROMIDE MR 6 SDWIS / NN0403003 / 2946
2017 Gross Alpha, Excl. Radon and U MR 5 SDWIS / NN0403003 / 4000
2017 1,2,4-Trichlorobenzene MR 4 SDWIS / NN0403003 / 2378
2017 cis-1,2-Dichloroethylene MR 4 SDWIS / NN0403003 / 2380
2017 DICHLOROMETHANE MR 4 SDWIS / NN0403003 / 2964

How Kayenta NTUA Compares

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

Metric Kayenta NTUA Navajo Nation avg Federal benchmark
Total violations 258 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 8 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,844 984 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 Kayenta NTUA water safe to drink? ▼
Kayenta NTUA (PWS ID: NN0403003) has 258 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 3,844 people using Groundwater sources.
How many people does Kayenta NTUA serve? ▼
Kayenta NTUA serves 3,844 people in Ft Defiance, Navajo Nation. It is a Native American-owned system using Groundwater water sources with 1,134 service connections.
What type of violations does Kayenta NTUA have? ▼
Kayenta NTUA has 258 total violations: 0 health-based violations (MCL exceedances or treatment failures), 244 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Kayenta NTUA water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in Kayenta NTUA's water supply: 6:2 FTS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Kayenta NTUA use? ▼
Kayenta 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.