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Dilcon Community Boarding School BIA

Arizona — Community Water System — PWSID: NN0436006

System Information

PWSIDNN0436006
System NameDilcon Community Boarding School BIA
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeFederal
EPA Region09
Serves SchoolYes
WholesalerNo
First ReportedFeb 2, 1984
Last ReportedDec 31, 2025

Location & Contact

StateArizona
CityWinslow
ZIP Code86047
AddressHC 63 Box G
OrganizationBIA Dilcon Community School, Inc
Phone9286573211

Population & Service

Population Served473
Service Connections60

Drinking Water Violations (110)

This water system has 110 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, 2025 Jun 30, 2025 Arsenic MR No Yes — 0.010 mg/L — Archived Jun 30, 2025 Arsenic Rule
Mar 1, 2025 Mar 31, 2025 Revised Total Coliform Rule MON No Yes — — — Resolved Mar 31, 2025 Revised Total Coliform Rule
Mar 1, 2025 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Jan 1, 2025 Mar 31, 2025 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2025 Arsenic Rule
Jan 1, 2025 Mar 31, 2025 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2025 Arsenic Rule
Jan 1, 2025 Mar 31, 2025 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2025 Arsenic Rule
Oct 1, 2024 Dec 31, 2024 Arsenic MR No Yes — 0.010 mg/L — Resolved Nov 13, 2024 Arsenic Rule
Jul 1, 2024 Sep 30, 2024 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2024 Arsenic Rule
Jan 1, 2024 — Public Notice Other No No — — — Resolved Dec 21, 2023 Public Notice Rule and Revised PN Rule
Jan 1, 2024 Mar 31, 2024 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2024 Arsenic Rule
Jan 1, 2024 Dec 31, 2024 Nitrate MR No Yes — 10 mg/L — Resolved Nov 13, 2024 Nitrate Rule
Jan 1, 2024 Dec 31, 2024 Nitrite MR No Yes — 1 mg/L — Resolved Nov 13, 2024 Nitrate Rule
Jan 1, 2024 Mar 31, 2024 Arsenic MCL Yes No .012 MG/L 0.010 mg/L — Resolved Mar 31, 2024 Arsenic Rule
Oct 1, 2023 — Revised Total Coliform Rule RPT No No — — — Resolved Nov 30, 2023 Revised Total Coliform Rule
Oct 1, 2022 — Revised Total Coliform Rule RPT No No — — — Resolved Nov 17, 2022 Revised Total Coliform Rule
Jan 1, 2021 Jan 31, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Jan 31, 2021 Revised Total Coliform Rule
May 1, 2020 — Revised Total Coliform Rule RPT No No — — — Resolved Jun 19, 2020 Revised Total Coliform Rule
Apr 1, 2020 Apr 30, 2020 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2020 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Jul 18, 2018 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Jul 18, 2018 Revised Total Coliform Rule
Apr 1, 2016 — Revised Total Coliform Rule Other No No — — — Resolved Jul 18, 2018 Revised Total Coliform Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .0103 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .0103 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Oct 1, 2015 Dec 31, 2015 Arsenic MCL Yes No .0103 MG/L 0.010 mg/L — Resolved Dec 31, 2015 Arsenic Rule
Jul 1, 2015 — Public Notice Other No No — — — Resolved Jan 21, 2016 Public Notice Rule and Revised PN Rule
Jul 1, 2015 Sep 30, 2015 Arsenic MCL Yes No .0105 MG/L 0.010 mg/L — Resolved Sep 30, 2015 Arsenic Rule
Jul 1, 2015 Sep 30, 2015 Arsenic MCL Yes No .0105 MG/L 0.010 mg/L — Resolved Sep 30, 2015 Arsenic Rule
Jul 1, 2015 Sep 30, 2015 Arsenic MCL Yes No .0105 MG/L 0.010 mg/L — Resolved Sep 30, 2015 Arsenic Rule
Apr 1, 2015 Jun 30, 2015 Arsenic MR No Yes — 0.010 mg/L — Resolved Jun 18, 2015 Arsenic Rule
Apr 1, 2015 Jun 30, 2015 Arsenic MR No Yes — 0.010 mg/L — Resolved Jun 18, 2015 Arsenic Rule
Jan 1, 2015 Mar 31, 2015 Arsenic MCL Yes No .0113 MG/L 0.010 mg/L — Resolved Mar 18, 2015 Arsenic Rule
Jan 1, 2015 Mar 31, 2015 Arsenic MCL Yes No .0113 MG/L 0.010 mg/L — Resolved Mar 18, 2015 Arsenic Rule
Jan 1, 2015 Mar 31, 2015 Arsenic MCL Yes No .0113 MG/L 0.010 mg/L — Resolved Mar 18, 2015 Arsenic Rule
Jan 1, 2015 — Public Notice Other No No — — — Resolved Jun 28, 2015 Public Notice Rule and Revised PN Rule
Jan 1, 2015 — Public Notice Other No No — — — Resolved Jun 28, 2015 Public Notice Rule and Revised PN Rule
Jan 1, 2015 — Public Notice Other No No — — — Resolved Jun 28, 2015 Public Notice Rule and Revised PN Rule
Jan 1, 2015 — Public Notice Other No No — — — Resolved Jun 28, 2015 Public Notice Rule and Revised PN Rule
Oct 1, 2014 Dec 31, 2014 Arsenic MCL Yes No .01133 MG/L 0.010 mg/L — Resolved Dec 31, 2014 Arsenic Rule
Oct 1, 2014 Dec 31, 2014 Arsenic MCL Yes No .01133 MG/L 0.010 mg/L — Resolved Dec 31, 2014 Arsenic Rule
Oct 1, 2014 Dec 31, 2014 Arsenic MCL Yes No .01133 MG/L 0.010 mg/L — Resolved Dec 31, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MCL Yes No .0117 MG/L 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MCL Yes No .0117 MG/L 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MCL Yes No .0117 MG/L 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 Sep 30, 2014 Arsenic MCL Yes No .0117 MG/L 0.010 mg/L — Resolved Sep 30, 2014 Arsenic Rule
Jul 1, 2014 — Public Notice Other No No — — — Resolved Jun 23, 2015 Public Notice Rule and Revised PN Rule
Jul 1, 2014 — Public Notice Other No No — — — Resolved Jun 23, 2015 Public Notice Rule and Revised PN Rule
Jul 1, 2014 — Public Notice Other No No — — — Resolved Jun 23, 2015 Public Notice Rule and Revised PN Rule
Jul 1, 2014 — Public Notice Other No No — — — Resolved Jun 23, 2015 Public Notice Rule and Revised PN Rule
Apr 1, 2014 Jun 30, 2014 Arsenic MCL Yes No .012 MG/L 0.010 mg/L — Resolved Jun 30, 2014 Arsenic Rule
Apr 1, 2014 Jun 30, 2014 Arsenic MCL Yes No .012 MG/L 0.010 mg/L — Resolved Jun 30, 2014 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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