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Mariano Lake-Pinedale-Church Rock NTUA

Arizona — Community Water System — PWSID: NN3500211

System Information

PWSIDNN3500211
System NameMariano Lake-Pinedale-Church Rock 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 Served4,562
Service Connections1,334

Drinking Water Violations (105)

This water system has 105 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
Jan 1, 2021 Dec 31, 2021 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2021 Inorganic Chemicals
Jan 1, 2020 Dec 31, 2020 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2020 Inorganic Chemicals
Jan 1, 2020 Dec 31, 2020 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2020 Inorganic Chemicals
Jan 1, 2020 Dec 31, 2020 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2020 Inorganic Chemicals
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 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
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
Apr 1, 2017 Apr 30, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2017 Revised Total Coliform Rule
Apr 1, 2017 Apr 30, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2017 Revised Total Coliform Rule
Apr 1, 2017 Apr 30, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2017 Revised Total Coliform Rule
Mar 1, 2017 Mar 31, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Mar 31, 2017 Revised Total Coliform Rule
Mar 1, 2017 Mar 31, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Mar 31, 2017 Revised Total Coliform Rule
Mar 1, 2017 Mar 31, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Mar 31, 2017 Revised Total Coliform Rule
Feb 1, 2017 Feb 28, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Feb 28, 2017 Revised Total Coliform Rule
Feb 1, 2017 Feb 28, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Feb 28, 2017 Revised Total Coliform Rule
Feb 1, 2017 Feb 28, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Feb 28, 2017 Revised Total Coliform Rule
Jan 1, 2017 Jan 31, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Jan 31, 2017 Revised Total Coliform Rule
Jan 1, 2017 Jan 31, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Jan 31, 2017 Revised Total Coliform Rule
Jan 1, 2017 Jan 31, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Jan 31, 2017 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Unaddressed — Revised Total Coliform Rule
Jan 1, 2014 Dec 31, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 Glyphosate MR No Yes — 0.7 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Diquat MR No Yes — 0.02 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Diquat MR No Yes — 0.02 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Diquat MR No Yes — 0.02 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Glyphosate MR No Yes — 0.7 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Jul 1, 2013 Sep 30, 2013 Glyphosate MR No Yes — 0.7 mg/L — Resolved Sep 30, 2013 Synthetic Organic Chemicals
Dec 1, 2012 Dec 31, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 2012 Total Coliform Rule
Dec 1, 2012 Dec 31, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 2012 Total Coliform Rule
Nov 1, 2012 Nov 30, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2012 Total Coliform Rule
Feb 1, 2012 Feb 29, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 29, 2012 Total Coliform Rule
Feb 1, 2012 Feb 29, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 29, 2012 Total Coliform Rule
Feb 1, 2012 Feb 29, 2012 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 29, 2012 Total Coliform Rule
Oct 1, 2010 Dec 31, 2010 1,2-DIBROMO-3-CHLOROPROPANE MCL Yes No .0004 MG/L 0.0002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2010 Dec 31, 2010 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2010 Nitrate Rule
Jan 1, 2008 Dec 31, 2010 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals

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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