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Mexican Water NTUA

Arizona — Community Water System — PWSID: NN4903072

System Information

PWSIDNN4903072
System NameMexican Water NTUA
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeNative American
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedDec 1, 2005
Last ReportedDec 31, 2025

Location & Contact

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

Population & Service

Population Served294
Service Connections86

Drinking Water Violations (141)

This water system has 141 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, 2024 Jun 30, 2024 Arsenic MCL Yes No .01128 MG/L 0.010 mg/L — Resolved Jun 30, 2024 Arsenic Rule
Apr 1, 2024 Jun 30, 2024 Arsenic MCL Yes No .01128 MG/L 0.010 mg/L — Resolved Jun 30, 2024 Arsenic Rule
Apr 1, 2024 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Jan 1, 2024 Mar 31, 2024 Arsenic MCL Yes No .01193 MG/L 0.010 mg/L — Resolved Mar 31, 2024 Arsenic Rule
Jan 1, 2024 Mar 31, 2024 Arsenic MCL Yes No .01193 MG/L 0.010 mg/L — Resolved Mar 31, 2024 Arsenic Rule
Jan 1, 2024 Mar 31, 2024 Arsenic MCL Yes No .01193 MG/L 0.010 mg/L — Resolved Mar 31, 2024 Arsenic Rule
Jan 1, 2024 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Oct 1, 2023 Dec 31, 2023 Arsenic MCL Yes No .0117 MG/L 0.010 mg/L — Resolved Dec 31, 2023 Arsenic Rule
Oct 1, 2023 Dec 31, 2023 Arsenic MCL Yes No .0117 MG/L 0.010 mg/L — Resolved Dec 31, 2023 Arsenic Rule
Oct 1, 2023 — Public Notice Other No No — — — Resolved Dec 12, 2023 Public Notice Rule and Revised PN Rule
Oct 1, 2023 — Public Notice Other No No — — — Resolved Dec 12, 2023 Public Notice Rule and Revised PN Rule
Jul 1, 2023 Sep 30, 2023 Arsenic MCL Yes No .012 MG/L 0.010 mg/L — Resolved Sep 30, 2023 Arsenic Rule
Jul 1, 2023 Sep 30, 2023 Arsenic MCL Yes No .012 MG/L 0.010 mg/L — Resolved Sep 30, 2023 Arsenic Rule
Jul 1, 2023 Sep 30, 2023 Arsenic MCL Yes No .012 MG/L 0.010 mg/L — Resolved Sep 30, 2023 Arsenic Rule
Jul 1, 2022 Sep 30, 2022 Arsenic MCL Yes No .0118 MG/L 0.010 mg/L — Resolved Sep 30, 2022 Arsenic Rule
Jul 1, 2022 Sep 30, 2022 Arsenic MCL Yes No .0118 MG/L 0.010 mg/L — Resolved Sep 30, 2022 Arsenic Rule
Jul 1, 2022 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Apr 1, 2022 — Public Notice Other No No — — — Resolved Dec 12, 2023 Public Notice Rule and Revised PN Rule
Apr 1, 2022 Jun 30, 2022 Arsenic MCL Yes No .0143 MG/L 0.010 mg/L — Resolved Jun 30, 2022 Arsenic Rule
Apr 1, 2022 Jun 30, 2022 Arsenic MCL Yes No .0143 MG/L 0.010 mg/L — Resolved Jun 30, 2022 Arsenic Rule
Apr 1, 2022 — Public Notice Other No No — — — Resolved Dec 12, 2023 Public Notice Rule and Revised PN Rule
Jan 1, 2022 Mar 31, 2022 Arsenic MCL Yes No .0114 MG/L 0.010 mg/L — Resolved Mar 31, 2022 Arsenic Rule
Jan 1, 2022 Mar 31, 2022 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2022 Arsenic Rule
Jan 1, 2022 — Public Notice Other No No — — — Resolved Jul 1, 2023 Public Notice Rule and Revised PN Rule
Jan 1, 2022 — Public Notice Other No No — — — Resolved Jul 1, 2023 Public Notice Rule and Revised PN Rule
Oct 1, 2021 Dec 31, 2021 Arsenic MCL Yes No .0114 MG/L 0.010 mg/L — Resolved Dec 31, 2021 Arsenic Rule
Oct 1, 2021 Dec 31, 2021 Arsenic MCL Yes No .0114 MG/L 0.010 mg/L — Resolved Dec 31, 2021 Arsenic Rule
Oct 1, 2021 — Public Notice Other No No — — — Resolved Oct 25, 2022 Public Notice Rule and Revised PN Rule
Jun 1, 2021 Jun 30, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2021 Revised Total Coliform Rule
Jul 1, 2019 Sep 30, 2019 Arsenic MCL Yes No .0109 MG/L 0.010 mg/L — Resolved Sep 30, 2019 Arsenic Rule
Jul 1, 2019 Sep 30, 2019 Arsenic MCL Yes No .0109 MG/L 0.010 mg/L — Resolved Sep 30, 2019 Arsenic Rule
Jul 1, 2019 — Public Notice Other No No — — — Resolved Oct 25, 2022 Public Notice Rule and Revised PN Rule
Jul 1, 2019 — Public Notice Other No No — — — Resolved Oct 25, 2022 Public Notice Rule and Revised PN Rule
Jan 1, 2019 Mar 31, 2019 Arsenic MR No Yes — 0.010 mg/L — Resolved Feb 12, 2019 Arsenic Rule
Jan 1, 2019 Mar 31, 2019 Arsenic MR No Yes — 0.010 mg/L — Resolved Feb 12, 2019 Arsenic Rule
Jan 1, 2019 Mar 31, 2019 Arsenic MR No Yes — 0.010 mg/L — Resolved Feb 12, 2019 Arsenic Rule
Jul 1, 2016 Sep 30, 2016 Arsenic MCL Yes No .0108 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Jul 1, 2016 Sep 30, 2016 Arsenic MCL Yes No .0108 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Apr 1, 2016 Jun 30, 2016 Arsenic MCL Yes No .0133 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Apr 1, 2016 Jun 30, 2016 Arsenic MCL Yes No .0133 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Mar 7, 2025 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Mar 7, 2025 Revised Total Coliform Rule
Jan 1, 2016 Mar 31, 2016 Arsenic MCL Yes No .0133 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Jan 1, 2016 Mar 31, 2016 Arsenic MCL Yes No .0133 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Jan 1, 2016 Mar 31, 2016 Arsenic MCL Yes No .0133 MG/L 0.010 mg/L — Resolved Jan 1, 2016 Arsenic Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .013 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Oct 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN Rule
Oct 1, 2015 — Public Notice Other No No — — — Resolved Jul 1, 2016 Public Notice Rule and Revised PN Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .013 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .013 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic 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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