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Fort Defiance-Window Rock-St Michaels NTUA

Arizona — Community Water System — PWSID: NN0403000

System Information

PWSIDNN0403000
System NameFort Defiance-Window Rock-St Michaels NTUA
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeNative American
EPA Region09
Serves SchoolNo
WholesalerYes
First ReportedFeb 2, 1984
Last ReportedDec 31, 2025

Location & Contact

StateArizona
CityFt Defiance
ZIP Code86504
AddressOffice of Deputy General Manager
OrganizationNavajo Tribal Utility Authority
Phone9287296277

Population & Service

Population Served12,869
Service Connections3,763

Drinking Water Violations (247)

This water system has 247 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
Feb 1, 2025 — Revised Total Coliform Rule TT Yes No — — — Unaddressed — Revised Total Coliform Rule
Feb 1, 2025 — Revised Total Coliform Rule TT Yes No — — — Unaddressed — Revised Total Coliform Rule
Feb 1, 2025 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Jul 1, 2018 Sep 30, 2018 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2018 Jun 30, 2018 TTHM MR No Yes — 0.080 mg/L — Resolved Jun 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2018 Jun 30, 2018 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jun 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2018 Jun 30, 2018 TTHM MR No Yes — 0.080 mg/L — Resolved Jun 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2018 Jun 30, 2018 TTHM MR No Yes — 0.080 mg/L — Resolved Jun 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2018 Jun 30, 2018 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jun 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2018 Jun 30, 2018 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jun 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2018 Dec 31, 2018 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2018 Nitrate Rule
Jan 1, 2018 Dec 31, 2018 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2018 Nitrate Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No .0843 MG/L 0.080 mg/L — Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No .0843 MG/L 0.080 mg/L — Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 — Public Notice Other No No — — — Resolved May 19, 2017 Public Notice Rule and Revised PN Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No .0843 MG/L 0.080 mg/L — Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2016 Dec 31, 2016 TTHM MCL Yes No .0829 MG/L 0.080 mg/L — Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2016 Dec 31, 2016 TTHM MCL Yes No .0829 MG/L 0.080 mg/L — Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2016 Dec 31, 2016 TTHM MCL Yes No .0829 MG/L 0.080 mg/L — Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 TTHM MCL Yes No .0932 MG/L 0.080 mg/L — Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 TTHM MCL Yes No .0932 MG/L 0.080 mg/L — Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Sep 30, 2025 Revised Total Coliform Rule
Apr 1, 2016 Jun 30, 2016 TTHM MCL Yes No .1148 MG/L 0.080 mg/L — Resolved Jun 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Sep 30, 2025 Revised Total Coliform Rule
Apr 1, 2016 Jun 30, 2016 TTHM MCL Yes No .1148 MG/L 0.080 mg/L — Resolved Jun 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2016 Feb 29, 2016 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 29, 2016 Total Coliform Rule
Jan 1, 2016 Mar 31, 2016 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 8, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 8, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 8, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MCL Yes No .1148 MG/L 0.080 mg/L — Resolved Mar 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 8, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MCL Yes No .1148 MG/L 0.080 mg/L — Resolved Mar 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MCL Yes No .1148 MG/L 0.080 mg/L — Resolved Mar 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 8, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 8, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Dec 31, 2015 TTHM MCL Yes No .1076 MG/L 0.080 mg/L — Resolved Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN Rule
Oct 1, 2015 Dec 31, 2015 TTHM MCL Yes No .1076 MG/L 0.080 mg/L — Resolved Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN Rule
Jul 1, 2015 Sep 30, 2015 TTHM MCL Yes No .0844 MG/L 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN Rule
Jul 1, 2015 Sep 30, 2015 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 TTHM MCL Yes No .0844 MG/L 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 TTHM MCL Yes No .0844 MG/L 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN Rule
Jul 1, 2015 Sep 30, 2015 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts 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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