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Defiance NTUA

Arizona — Community Water System — PWSID: NN3500277

System Information

PWSIDNN3500277
System NameDefiance 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 Served1,659
Service Connections485

Drinking Water Violations (154)

This water system has 154 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 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2021 Nitrate Rule
Jan 1, 2021 Dec 31, 2021 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2021 Nitrate Rule
Jan 1, 2021 Dec 31, 2021 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2021 Nitrate Rule
Jan 1, 2021 Dec 31, 2021 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2021 Nitrate Rule
Jan 1, 2021 Dec 31, 2021 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2021 Nitrate Rule
Jan 1, 2021 Dec 31, 2021 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2021 Nitrate 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 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 Jun 30, 2017 Toluene MR No Yes — 1 mg/L — Resolved Jun 27, 2017 Volatile Organic Chemicals
Apr 1, 2017 Apr 30, 2017 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2017 Revised Total Coliform Rule
Apr 1, 2017 Jun 30, 2017 Toluene MR No Yes — 1 mg/L — Resolved Jun 27, 2017 Volatile Organic Chemicals
Apr 1, 2017 Jun 30, 2017 Toluene MR No Yes — 1 mg/L — Resolved Jun 27, 2017 Volatile Organic Chemicals
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
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Feb 23, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Feb 23, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Feb 23, 2023 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, 2011 Dec 31, 2013 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2013 Synthetic Organic Chemicals
Jan 1, 2011 Dec 31, 2013 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2013 Synthetic Organic Chemicals
Jan 1, 2011 Dec 31, 2013 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2013 Synthetic Organic 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 CYANIDE MR No Yes — 0.2 mg/L — Resolved Dec 31, 2013 Inorganic 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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