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Mittenrock NTUA

Arizona — Community Water System — PWSID: NN3503057

System Information

PWSIDNN3503057
System NameMittenrock NTUA
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeNative American
EPA Region09
Serves SchoolNo
WholesalerNo
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 Served352
Service Connections103

Drinking Water Violations (95)

This water system has 95 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, 2017 — Public Notice Other No No — — — Resolved May 19, 2017 Public Notice Rule and Revised PN Rule
Jan 1, 2017 Mar 31, 2017 Arsenic MCL Yes No .0107 MG/L 0.010 mg/L — Resolved Feb 6, 2017 Arsenic Rule
Oct 1, 2016 Dec 31, 2016 Arsenic MCL Yes No .0105 MG/L 0.010 mg/L — Resolved Dec 31, 2016 Arsenic Rule
Oct 1, 2016 Dec 31, 2016 Arsenic MCL Yes No .0105 MG/L 0.010 mg/L — Resolved Dec 31, 2016 Arsenic Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .0109 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Oct 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN 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 Arsenic MCL Yes No .0109 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .0109 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jan 1, 2014 Mar 31, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2014 Arsenic Rule
Jan 1, 2014 Mar 31, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2014 Arsenic Rule
Jan 1, 2014 Mar 31, 2014 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2014 Arsenic Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Oct 8, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Oct 8, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Oct 8, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 Arsenic MCL Yes No .01075 MG/L 0.010 mg/L — Resolved Jun 30, 2013 Arsenic Rule
Jan 1, 2013 Mar 31, 2013 Arsenic MCL Yes No .01075 MG/L 0.010 mg/L — Resolved Mar 31, 2013 Arsenic Rule
Jan 1, 2013 Mar 31, 2013 Arsenic MCL Yes No .01075 MG/L 0.010 mg/L — Resolved Mar 31, 2013 Arsenic Rule
Jan 1, 2013 Mar 31, 2013 Arsenic MCL Yes No .01075 MG/L 0.010 mg/L — Resolved Mar 31, 2013 Arsenic Rule
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
Jan 1, 2011 Dec 31, 2013 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2013 Inorganic Chemicals
Jan 1, 2011 Dec 31, 2013 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2013 Inorganic Chemicals
Jan 1, 2011 Dec 31, 2013 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2013 Inorganic Chemicals
Jan 1, 2011 Dec 31, 2013 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2013 Inorganic Chemicals
Oct 1, 2010 Dec 31, 2010 Fluoride MCL Yes No 449 MG/L 4.0 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Oct 1, 2010 Dec 31, 2010 Arsenic MCL Yes No .0123 MG/L 0.010 mg/L — Resolved Dec 31, 2010 Arsenic Rule
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 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,2-DIBROMO-3-CHLOROPROPANE MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Heptachlor MR No Yes — 0.0004 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 LASSO MR No Yes — — — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Toxaphene MR No Yes — 0.003 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Chlordane MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Hexachlorocyclopentadiene MR No Yes — 0.05 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Picloram MR No Yes — 0.5 mg/L — Resolved Dec 31, 2010 Synthetic 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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