Toadlena NTUA

Arizona — Community Water System — PWSID: NN3503028

System Information

PWSID	NN3503028
System Name	Toadlena NTUA
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Native American
EPA Region	09
Serves School	No
Wholesaler	No
First Reported	Feb 2, 1984
Last Reported	Dec 31, 2025

Location & Contact

State	Arizona
City	Ft Defiance
ZIP Code	86504
Address	Office of Deputy General Manager
Organization	Navajo Tribal Utility Authority
Phone	9287296277

Population & Service

Population Served	903
Service Connections	264

Drinking Water Violations (196)

This water system has 196 violations recorded in the EPA SDWIS database.

Begin Date	End Date	Contaminant	Category	Health-Based	Major	Measured	Federal MCL	State MCL	Status	Return to Compliance	Rule
Jul 1, 2025	Sep 30, 2025	Arsenic	MCL	Yes	No	.0127 MG/L	0.010 mg/L	—	Archived	Sep 30, 2025	Arsenic Rule
Apr 1, 2025	Jun 30, 2025	Arsenic	MCL	Yes	No	.01165 MG/L	0.010 mg/L	—	Archived	Jun 30, 2025	Arsenic Rule
Apr 1, 2025	—	Public Notice	Other	No	No	—	—	—	Unaddressed	—	Public Notice Rule and Revised PN Rule
Jan 1, 2025	Mar 31, 2025	Arsenic	MCL	Yes	No	.01263 MG/L	0.010 mg/L	—	Archived	Mar 31, 2025	Arsenic Rule
Oct 1, 2024	Dec 31, 2024	Arsenic	MCL	Yes	No	.01273 MG/L	0.010 mg/L	—	Archived	Dec 31, 2024	Arsenic Rule
Oct 1, 2024	—	Public Notice	Other	No	No	—	—	—	Unaddressed	—	Public Notice Rule and Revised PN Rule
Jul 1, 2024	Sep 30, 2024	Arsenic	MCL	Yes	No	.01363 MG/L	0.010 mg/L	—	Archived	Sep 30, 2024	Arsenic Rule
Jul 1, 2024	—	Public Notice	Other	No	No	—	—	—	Resolved	Aug 6, 2024	Public Notice Rule and Revised PN Rule
Apr 1, 2024	—	Public Notice	Other	No	No	—	—	—	Resolved	Apr 11, 2024	Public Notice Rule and Revised PN Rule
Apr 1, 2024	Jun 30, 2024	Arsenic	MCL	Yes	No	.01488 MG/L	0.010 mg/L	—	Archived	Jun 30, 2024	Arsenic Rule
Jan 1, 2024	Mar 31, 2024	Arsenic	MCL	Yes	No	.01428 MG/L	0.010 mg/L	—	Archived	Mar 31, 2024	Arsenic Rule
Oct 1, 2023	Dec 31, 2023	Arsenic	MCL	Yes	No	.0151 MG/L	0.010 mg/L	—	Archived	Dec 31, 2023	Arsenic Rule
Jul 1, 2023	Sep 30, 2023	Arsenic	MCL	Yes	No	.0145 MG/L	0.010 mg/L	—	Archived	Sep 30, 2023	Arsenic Rule
Apr 1, 2023	Jun 30, 2023	Arsenic	MCL	Yes	No	.0135 MG/L	0.010 mg/L	—	Archived	Jun 30, 2023	Arsenic Rule
Jan 1, 2023	Mar 31, 2023	Arsenic	MCL	Yes	No	.0133 MG/L	0.010 mg/L	—	Archived	Mar 31, 2023	Arsenic Rule
Oct 1, 2022	Dec 31, 2022	Arsenic	MCL	Yes	No	.0128 MG/L	0.010 mg/L	—	Archived	Dec 31, 2022	Arsenic Rule
Jul 1, 2022	Sep 30, 2022	Arsenic	MCL	Yes	No	.0115 MG/L	0.010 mg/L	—	Archived	Sep 30, 2022	Arsenic Rule
Apr 1, 2022	—	Public Notice	Other	No	No	—	—	—	Resolved	Apr 7, 2022	Public Notice Rule and Revised PN Rule
Apr 1, 2022	Jun 30, 2022	Arsenic	MCL	Yes	No	.0119 MG/L	0.010 mg/L	—	Archived	Jun 30, 2022	Arsenic Rule
Jan 1, 2022	Mar 31, 2022	Arsenic	MCL	Yes	No	.0135 MG/L	0.010 mg/L	—	Archived	Mar 31, 2022	Arsenic Rule
Jan 1, 2022	Mar 31, 2022	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Mar 31, 2022	Arsenic Rule
Oct 1, 2021	Dec 31, 2021	Arsenic	MCL	Yes	No	.0157 MG/L	0.010 mg/L	—	Archived	Dec 31, 2021	Arsenic Rule
Jul 1, 2021	Sep 30, 2021	Arsenic	MCL	Yes	No	.0175 MG/L	0.010 mg/L	—	Archived	Sep 30, 2021	Arsenic Rule
Apr 1, 2021	Jun 30, 2021	Arsenic	MCL	Yes	No	.0178 MG/L	0.010 mg/L	—	Archived	Jun 30, 2021	Arsenic Rule
Apr 1, 2021	—	Public Notice	Other	No	No	—	—	—	Resolved	Jul 14, 2021	Public Notice Rule and Revised PN Rule
Jan 1, 2021	Mar 31, 2021	Arsenic	MCL	Yes	No	.0177 MG/L	0.010 mg/L	—	Archived	Mar 31, 2021	Arsenic Rule
Oct 1, 2020	Dec 31, 2020	Arsenic	MCL	Yes	No	.0156 MG/L	0.010 mg/L	—	Archived	Dec 31, 2020	Arsenic Rule
Jul 1, 2020	Sep 30, 2020	Arsenic	MCL	Yes	No	.0146 MG/L	0.010 mg/L	—	Archived	Sep 30, 2020	Arsenic Rule
Apr 1, 2020	—	Public Notice	Other	No	No	—	—	—	Resolved	Apr 3, 2020	Public Notice Rule and Revised PN Rule
Apr 1, 2020	—	Public Notice	Other	No	No	—	—	—	Resolved	Apr 3, 2020	Public Notice Rule and Revised PN Rule
Apr 1, 2020	Jun 30, 2020	Arsenic	MCL	Yes	No	.0149 MG/L	0.010 mg/L	—	Archived	Jun 30, 2020	Arsenic Rule
Jan 1, 2020	Dec 31, 2020	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2020	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020	Dec 31, 2020	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2020	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020	Dec 31, 2020	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2020	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020	Mar 31, 2020	Arsenic	MCL	Yes	No	.0149 MG/L	0.010 mg/L	—	Archived	Mar 31, 2020	Arsenic Rule
Jan 1, 2020	Dec 31, 2020	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2020	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020	Dec 31, 2020	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2020	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020	Dec 31, 2020	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2020	Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2019	Dec 31, 2019	Arsenic	MCL	Yes	No	.0148 MG/L	0.010 mg/L	—	Archived	Dec 31, 2019	Arsenic Rule
Jul 1, 2019	Sep 30, 2019	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2019	Arsenic Rule
Jul 1, 2019	Sep 30, 2019	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2019	Arsenic Rule
Jul 1, 2019	Sep 30, 2019	Arsenic	MCL	Yes	No	.0153 MG/L	0.010 mg/L	—	Archived	Sep 30, 2019	Arsenic Rule
Jul 1, 2019	Sep 30, 2019	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Sep 30, 2019	Arsenic Rule
Apr 1, 2019	Jun 30, 2019	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Jun 30, 2019	Arsenic Rule
Apr 1, 2019	Jun 30, 2019	Arsenic	MCL	Yes	No	.0146 MG/L	0.010 mg/L	—	Archived	Jun 30, 2019	Arsenic Rule
Jan 1, 2019	Mar 31, 2019	Arsenic	MCL	Yes	No	.0147 MG/L	0.010 mg/L	—	Archived	Mar 31, 2019	Arsenic Rule
Jan 1, 2019	Mar 31, 2019	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Feb 12, 2019	Arsenic Rule
Jan 1, 2019	Mar 31, 2019	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Feb 12, 2019	Arsenic Rule
Oct 1, 2018	Dec 31, 2018	Arsenic	MCL	Yes	No	.0147 MG/L	0.010 mg/L	—	Archived	Dec 31, 2018	Arsenic Rule
Oct 1, 2018	—	Public Notice	Other	No	No	—	—	—	Resolved	Dec 17, 2018	Public Notice Rule and Revised PN Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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