Vehicle Safety
Recalls Search 320,000+ NHTSA safety recalls Complaints 2.1M+ consumer safety complaints TSBs 4.7M technical service bulletins VIN Lookup Decode any vehicle VIN instantly OBD Codes 12,000+ diagnostic trouble codes Fuel Economy EPA MPG data for all vehicles Statistics Recall trends & safety analysis
Consumer Safety
Product Safety 9,700+ CPSC product recalls Food Safety 28,600+ FDA food recalls Pet Safety 1.3M FDA animal adverse events Drug Safety 17,500+ FDA drug recalls Device Safety 38,400+ FDA device recalls Workplace Safety 102,900+ OSHA injury reports
Infrastructure
Bridge Safety 624,000 bridge inspections Aviation Safety 30,000+ NTSB aviation events Dam Safety 92,600 dam safety records Water Safety 433,000+ public water systems Railroad Safety 438,000+ rail crossings Pipeline Safety 8,800+ pipeline incidents
Public Health
Nursing Homes 14,700 CMS rated facilities Environmental 80,000+ hazardous sites & releases

Dennehotso NTUA

Arizona — Community Water System — PWSID: NN0400296

System Information

PWSIDNN0400296
System NameDennehotso 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 Served1,040
Service Connections304

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
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
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 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
Jun 1, 2016 Jun 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2016 Revised Total Coliform Rule
Jun 1, 2016 Jun 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2016 Revised Total Coliform Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Nov 28, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Nov 28, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Nov 28, 2018 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 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 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 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2005 Dec 31, 2010 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Volatile Organic 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.

Browse All Water Systems Water Safety Stats Water Safety Home
Browse All Water Systems Water Systems in Arizona