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Round Rock NTUA

Arizona — Community Water System — PWSID: NN0403023

System Information

PWSIDNN0403023
System NameRound Rock 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 Served876
Service Connections256

Drinking Water Violations (58)

This water system has 58 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, 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
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
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Feb 10, 2025 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Feb 10, 2025 Revised Total Coliform Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Mar 22, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Mar 22, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2013 — Stage 2 Disinfectants and Disinfection Byproducts Rule MR No Yes — — — Resolved Mar 22, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.325 PCI/L 5 pCi/L — Resolved Sep 30, 2013 Radionuclides and Revised Rad Rule
Jul 1, 2013 Sep 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.325 PCI/L 5 pCi/L — Resolved Sep 30, 2013 Radionuclides and Revised Rad Rule
Jul 1, 2013 Sep 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.325 PCI/L 5 pCi/L — Resolved Sep 30, 2013 Radionuclides and Revised Rad Rule
Jul 1, 2013 Sep 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.325 PCI/L 5 pCi/L — Resolved Sep 30, 2013 Radionuclides and Revised Rad Rule
Apr 1, 2013 Jun 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.5 PCI/L 5 pCi/L — Resolved Jun 30, 2013 Radionuclides and Revised Rad Rule
Apr 1, 2013 Jun 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.5 PCI/L 5 pCi/L — Resolved Jun 30, 2013 Radionuclides and Revised Rad Rule
Apr 1, 2013 Jun 30, 2013 Combined Radium (-226 and -228) MCL Yes No 5.5 PCI/L 5 pCi/L — Resolved Jun 30, 2013 Radionuclides and Revised Rad Rule
Jan 1, 2013 Mar 31, 2013 Combined Radium (-226 and -228) MCL Yes No 6.075 PCI/L 5 pCi/L — Resolved Feb 28, 2013 Radionuclides and Revised Rad 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, 2012 Dec 31, 2012 Combined Radium (-226 and -228) MCL Yes No 6.075 PCI/L 5 pCi/L — Resolved Dec 31, 2012 Radionuclides and Revised Rad Rule
Oct 1, 2012 Dec 31, 2012 Combined Radium (-226 and -228) MCL Yes No 6.075 PCI/L 5 pCi/L — Resolved Dec 31, 2012 Radionuclides and Revised Rad Rule
Oct 1, 2012 Dec 31, 2012 Combined Radium (-226 and -228) MCL Yes No 6.075 PCI/L 5 pCi/L — Resolved Dec 31, 2012 Radionuclides and Revised Rad Rule
Oct 1, 2012 Dec 31, 2012 Combined Radium (-226 and -228) MCL Yes No 6.075 PCI/L 5 pCi/L — Resolved Dec 31, 2012 Radionuclides and Revised Rad Rule
Jul 1, 2012 Sep 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Sep 30, 2012 Radionuclides and Revised Rad Rule
Jul 1, 2012 Sep 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Sep 30, 2012 Radionuclides and Revised Rad Rule
Jul 1, 2012 Sep 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Sep 30, 2012 Radionuclides and Revised Rad Rule
Jul 1, 2012 Sep 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Sep 30, 2012 Radionuclides and Revised Rad Rule
Jul 1, 2012 Sep 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Sep 30, 2012 Radionuclides and Revised Rad Rule
Apr 1, 2012 Jun 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Jun 30, 2012 Radionuclides and Revised Rad Rule
Apr 1, 2012 Jun 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Jun 30, 2012 Radionuclides and Revised Rad Rule
Apr 1, 2012 Jun 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Jun 30, 2012 Radionuclides and Revised Rad Rule
Apr 1, 2012 Jun 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Jun 30, 2012 Radionuclides and Revised Rad Rule
Apr 1, 2012 Jun 30, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Jun 30, 2012 Radionuclides and Revised Rad Rule
Jan 1, 2012 Mar 31, 2012 Combined Radium (-226 and -228) MCL Yes No 5.46667 PCI/L 5 pCi/L — Resolved Feb 22, 2012 Radionuclides and Revised Rad Rule
Oct 1, 2010 Dec 31, 2010 Combined Radium (-226 and -228) MCL Yes No 5.1 PCI/L 5 pCi/L — Resolved Dec 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Dec 31, 2010 Nitrite MR No Yes — 1 mg/L — Resolved Dec 31, 2010 Nitrate Rule
Jan 1, 2010 Dec 31, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2010 Nitrate Rule
Jan 1, 2010 Dec 31, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2010 Nitrate Rule
Jan 1, 2010 Dec 31, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2010 Nitrate Rule
Aug 1, 2007 Aug 31, 2007 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 2007 Total Coliform Rule
Aug 1, 2007 Aug 31, 2007 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 2007 Total Coliform Rule
Jan 1, 2004 Dec 31, 2004 Gross Alpha, Excl. Radon and U MR No No — 15 pCi/L — Resolved Dec 31, 2004 Radionuclides and Revised Rad Rule
Jun 1, 2002 Jun 30, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2002 Total Coliform Rule
Jun 1, 2002 Jun 30, 2002 Coliform (TCR) MR No No — 5% of samples — Archived Jun 30, 2002 Total Coliform Rule
May 1, 2002 May 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved May 31, 2002 Total Coliform Rule
Apr 1, 2002 Apr 30, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 30, 2002 Total Coliform Rule
Apr 1, 2002 Apr 30, 2002 Coliform (TCR) MR No No — 5% of samples — Archived Apr 30, 2002 Total Coliform Rule

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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