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Chilchinbeto NTUA

Arizona — Community Water System — PWSID: NN0400290

System Information

PWSIDNN0400290
System NameChilchinbeto 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 Served1,276
Service Connections373

Drinking Water Violations (50)

This water system has 50 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, 2024 Dec 31, 2024 Nitrate MR No Yes — 10 mg/L — Resolved Sep 24, 2024 Nitrate Rule
Jan 1, 2024 Dec 31, 2024 Nitrite MR No Yes — 1 mg/L — Resolved Sep 24, 2024 Nitrate Rule
Jan 1, 2017 Dec 31, 2017 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Dec 31, 2017 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Dec 31, 2017 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Dec 31, 2017 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Dec 31, 2017 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Dec 31, 2017 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Jul 31, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Jul 31, 2016 Revised Total Coliform Rule
Jul 1, 2016 Jul 31, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Jul 31, 2016 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Unaddressed — Revised Total Coliform Rule
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
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, 2010 Dec 31, 2010 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2010 Nitrate Rule
Jan 1, 2005 Dec 31, 2010 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Xylenes, Total MR No Yes — 10 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Benzene MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2005 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2005 Nitrate Rule
Jan 1, 2005 Dec 31, 2010 Styrene MR No Yes — 0.1 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Toluene MR No Yes — 1 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved May 17, 2004 Volatile Organic Chemicals
Jun 1, 2003 Jun 30, 2003 Coliform (TCR) MR No No — 5% of samples — Archived Jun 30, 2003 Total Coliform Rule
Apr 1, 2002 Apr 30, 2002 Coliform (TCR) MR No No — 5% of samples — Archived Apr 30, 2002 Total Coliform Rule
— — — No No — — — — — —
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— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — 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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