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Whitehorse Lake NTUA

Arizona — Community Water System — PWSID: NN3500239

System Information

PWSIDNN3500239
System NameWhitehorse Lake NTUA
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeNative American
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 30, 2002
Last ReportedDec 31, 2025

Location & Contact

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

Population & Service

Population Served277
Service Connections81

Drinking Water Violations (59)

This water system has 59 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
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Unaddressed — Revised Total Coliform Rule
Oct 1, 2014 Dec 31, 2014 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2014 Dec 31, 2014 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2014 Synthetic Organic Chemicals
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Unaddressed — Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Unaddressed — Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 Nitrite MR No Yes — 1 mg/L — Resolved Sep 30, 2013 Nitrate Rule
Jul 1, 2013 Sep 30, 2013 Nitrite MR No Yes — 1 mg/L — Resolved Sep 30, 2013 Nitrate Rule
Jul 1, 2013 Sep 30, 2013 Nitrite MR No Yes — 1 mg/L — Resolved Sep 30, 2013 Nitrate Rule
Jul 1, 2013 Sep 30, 2013 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2013 Nitrate Rule
Jul 1, 2013 Sep 30, 2013 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2013 Nitrate Rule
Jul 1, 2013 Sep 30, 2013 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2013 Nitrate 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
Oct 1, 2010 Dec 31, 2010 Antimony, Total MCL Yes No .025 MG/L 0.006 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Oct 1, 2010 Dec 31, 2010 Antimony, Total MCL Yes No .025 MG/L 0.006 mg/L — Resolved Dec 31, 2010 Inorganic 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 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 ETHYLENE DIBROMIDE MR No Yes — 0.00005 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 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Mercury MR No Yes — 0.002 mg/L — Resolved Sep 10, 2008 Inorganic 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 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 Total Polychlorinated Biphenyls (PCB) MR No Yes — 0.0005 mg/L — Resolved Mar 24, 2009 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Total Polychlorinated Biphenyls (PCB) MR No Yes — 0.0005 mg/L — Resolved Mar 24, 2009 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Total Polychlorinated Biphenyls (PCB) MR No Yes — 0.0005 mg/L — Resolved Mar 24, 2009 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Mercury MR No Yes — 0.002 mg/L — Resolved Sep 10, 2008 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Mercury MR No Yes — 0.002 mg/L — Resolved Sep 10, 2008 Inorganic Chemicals
Jan 1, 2005 Dec 31, 2010 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2005 Dec 31, 2010 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2005 Dec 31, 2010 Combined Uranium MR No Yes — 30 ug/L — Resolved Dec 31, 2010 Radionuclides and Revised Rad Rule
Jun 21, 2000 Jun 20, 2001 Antimony, Total MCL Yes No .007 MG/L 0.006 mg/L — Resolved Jun 20, 2001 Inorganic Chemicals
— — — No No — — — — — —

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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