Dilkon-Indian Wells-Greasewood-White Cone NTUA

Compiled by PlainEnviro Editorial, Environmental Data Editorial Team · July 13, 2026

PWSID: NN0400342 · Fort Defiance, AZ · Serves 4,986 people

Health Violations

Dilkon-Indian Wells-Greasewood-White Cone NTUA has 105 health-based violations out of 105 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.

Population Served

4,986

Total Violations

105

Health Violations

105

Source Type

Groundwater

Dilkon-Indian Wells-Greasewood-White Cone NTUA (PWSID NN0400342) is a cws water system drawing from a groundwater source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 4,986 people in Fort Defiance, AZ, and is subject to primacy enforcement by the Arizona drinking-water program.

The system's federal compliance record contains 105 total violations, with 105 classified as health-based (MCL exceedances or treatment-technique failures). 3 distinct contaminants have been cited, including Total Trihalomethanes (TTHM), E. coli, Total Coliform (RTCR). Recorded violations span 2015–2024.

A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Arizona state drinking-water program's public portal.

System Details

EPA ID (PWSID): NN0400342
System Type: CWS
Water Source: Groundwater
Location: Fort Defiance, AZ
Population Served: 4,986
Health Violations: Yes (105)

What contaminants are in this water system?

Contaminant	Violations	Health-Based
Total Trihalomethanes (TTHM)	101	101
E. coli	2	2
Total Coliform (RTCR)	2	2

Violation History (105)

Contaminant	Type	Health	Date	Enforcement
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2024	0400342OX05082441829
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2024	0400342OX05082441829
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2023	0400342OX05082441857
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2023	0400342FL04031340762
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2023	0400342FL04031340420
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2023	0400342OX05082441856
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2023	0400342FL04031340420
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2023	0400342FL04031340299
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2023	0400342OX05082441855
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2023	0400342FL04031340299
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2023	0400342FL04031340188
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2023	0400342FL04031340188
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2023	0400342OX05082441854
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2023	0400342FL04031340188
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2022	0400342FL04031339922
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2022	0400342FL04031339922
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2022	0400342OX05082441853
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2022	0400342FL04031339676
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2022	0400342FL04031339676
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2022	0400342FL04031339676
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2022	0400342OX05082441852
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2022	0400342FL04031339513
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2022	0400342FL04031339513
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2022	0400342FL04031339513
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2022	0400342OX05082441851
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2022	0400342FL04031339420
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2022	0400342FL04031339420
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2022	0400342OX05082441850
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2021	0400342FL04031339098
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2021	0400342FL04031339098
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2021	0400342OX05082441849
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2021	0400342FL04031338967
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2021	0400342FL04031338967
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2021	0400342OX05082441848
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2021	0400342FL04031338774
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2021	0400342FL04031338774
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2021	0400342OX05082441847
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2021	0400342FL04031338670
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2021	0400342FL04031338670
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2021	0400342OX05082441846
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2020	0400342FL04031338101
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2020	0400342FL04031338101
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2020	0400342OX05082441845
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2020	0400342FL04031337979
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2020	0400342FL04031337979
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2020	0400342OX05082441844
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2020	0400342FL04031337748
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2020	0400342FL04031337748
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2020	0400342OX05082441843
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2020	0400342FL04031337632
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2020	0400342FL04031337632
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2020	0400342OX05082441842
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2019	0400342FL04031337429
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2019	0400342FL04031337429
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2019	0400342OX05082441841
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2019	0400342FL04031337117
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2019	0400342FL04031337117
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2019	0400342OX05082441840
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2019	0400342FL04031337041
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2019	0400342FL04031337041
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2019	0400342OX05082441839
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2019	0400342FL04031336923
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2019	0400342FL04031336923
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2019	0400342OX05082441838
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2018	0400342FL04031336596
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2018	0400342FL04031336596
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2018	0400342OX05082441837
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2018	0400342FL04031336488
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2018	0400342FL04031336488
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2018	0400342OX05082441836
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2018	0400342FL04031336317
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2018	0400342FL04031336317
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2018	0400342OX05082441835
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2018	0400342FL04031334507
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2018	0400342FL04031334507
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2018	0400342OX05082441834
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2017	0400342FL04031334356
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2017	0400342FL04031334356
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2017	0400342OX05082441833
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2017	0400342FL04031333860
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2017	0400342FL04031333860
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2017	0400342OX05082441832
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2017	0400342FJ08251733334
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2017	0400342FJ08251733334
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2017	0400342FJ08251733334
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2017	0400342FL04031333219
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2017	0400342FL04031333219
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2017	0400342OX05082441830
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2016	0400342FJ02271732932
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2016	0400342FJ02271732932
Total Trihalomethanes (TTHM)	MCL	Yes	Oct 1, 2016	0400342OX05082441831
E. coli	TT	Yes	Aug 1, 2016	0400342OX12171632881
E. coli	TT	Yes	Aug 1, 2016	0400342OX12171632881
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2016	0400342FJ12081632809
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2016	0400342FJ12081632809
Total Trihalomethanes (TTHM)	MCL	Yes	Jul 1, 2016	0400342OX05082441858
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2016	0400342OX08011532709
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2016	0400342OX08011532709
Total Trihalomethanes (TTHM)	MCL	Yes	Apr 1, 2016	0400342OX08011532709
Total Trihalomethanes (TTHM)	MCL	Yes	Jan 1, 2016	0400342OX08011632711

Showing 100 of 105 violations.

Frequently Asked Questions

Is Dilkon-Indian Wells-Greasewood-White Cone NTUA water safe to drink?

How many people does Dilkon-Indian Wells-Greasewood-White Cone NTUA serve?

Dilkon-Indian Wells-Greasewood-White Cone NTUA serves 4,986 people in Fort Defiance, AZ. It is classified as a CWS water system.

What violations does Dilkon-Indian Wells-Greasewood-White Cone NTUA have?

Dilkon-Indian Wells-Greasewood-White Cone NTUA has 105 total violations on record spanning 2015–2024. 105 are health-based violations involving contaminants exceeding EPA limits.

What contaminants have been found in Dilkon-Indian Wells-Greasewood-White Cone NTUA water?

Violations have been recorded for 3 contaminants. The most frequent: Total Trihalomethanes (TTHM), E. coli, Total Coliform (RTCR).

Nearby Water Systems

Farmington Rural-Shiprock-Beclabito NTUA

Ft Defiance · 15,233 served

4 viol.

Fort Defiance-Window Rock-St Michaels NTUA

Ft Defiance · 12,869 served

27 viol.

Chinle-Many Farms-Del Muerto NTUA

Ft Defiance · 8,458 served

Clean

Tuba City NTUA

Fort Defiance · 6,276 served

Clean

Pinon-District 4 NTUA

Ft Defiance · 5,195 served

Mariano Lake-Pinedale-Church Rock NTUA

Ft Defiance · 4,562 served

Clean

Crownpoint-Littlewater-Three Mile Point NTUA

Ft Defiance · 3,950 served

Clean

Ganado-Burnside-Cornfield-Steamboat NTUA

Ft Defiance · 3,947 served

3 viol.

Kayenta NTUA

Ft Defiance · 3,844 served

Clean

ST JOHNS CITY OF

Saint Johns · 3,500 served

Clean

Leupp-Birdsprings-Tolani Lake NTUA

Ft Defiance · 2,100 served

2 viol.

Explore More

Arizona Water Systems → All States → Contaminants →

About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

Browse all → | Rankings →

System Details

What contaminants are in this water system?

Violation History (105)

Frequently Asked Questions

Nearby Water Systems

Explore More

About This Data

Related