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BIA San Carlos

Arizona — Non-Transient Non-Community — PWSID: 090400060

System Information

PWSID090400060
System NameBIA San Carlos
System TypeNon-Transient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeFederal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedFeb 2, 1984
Last ReportedDec 31, 2025

Location & Contact

StateArizona
CitySan Carlos
ZIP Code85550
AddressPO Box O
OrganizationSan Carlos Apache Tribe
Phone9284751782

Population & Service

Population Served2,150
Service Connections75

Drinking Water Violations (309)

This water system has 309 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
Jul 1, 2025 — Revised Total Coliform Rule RPT No No — — — Resolved Aug 19, 2025 Revised Total Coliform Rule
Nov 16, 2024 — LEAD AND COPPER RULE REVISIONS RPT No No — — — Unaddressed — Lead and Copper Rule Revisions
Oct 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Nov 1, 2024 Revised Total Coliform Rule
Oct 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Nov 1, 2024 Revised Total Coliform Rule
Oct 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Nov 1, 2024 Revised Total Coliform Rule
Aug 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 3, 2024 Revised Total Coliform Rule
Jun 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 3, 2024 Revised Total Coliform Rule
Apr 19, 2024 — Groundwater Rule TT Yes No — — — Unaddressed — Ground Water Rule
Nov 1, 2023 — Revised Total Coliform Rule RPT No No — — — Resolved Feb 21, 2024 Revised Total Coliform Rule
Oct 1, 2023 — Revised Total Coliform Rule RPT No No — — — Resolved Feb 21, 2024 Revised Total Coliform Rule
Aug 1, 2023 Aug 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2023 Revised Total Coliform Rule
Aug 1, 2023 — Public Notice Other No No — — — Resolved Apr 16, 2024 Public Notice Rule and Revised PN Rule
Jul 1, 2023 Sep 30, 2023 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2023 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 Sep 30, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2022 Jun 30, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Jun 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 — Lead and Copper Rule MR No No — TT — Resolved Sep 30, 2023 Lead and Copper Rule
Dec 1, 2021 Dec 31, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2021 Revised Total Coliform Rule
Oct 1, 2021 Dec 31, 2021 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2021 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2021 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2021 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 15, 2020 Revised Total Coliform Rule
Jan 1, 2017 Dec 31, 2017 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2017 Nitrate Rule
Jan 1, 2016 Dec 31, 2016 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Jul 31, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2015 Total Coliform Rule
Jan 1, 2015 Dec 31, 2015 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2015 Dec 31, 2015 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2016 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 Atrazine MR No Yes — 0.003 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2016 Hexachlorocyclopentadiene MR No Yes — 0.05 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 Simazine MR No Yes — 0.004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 HEXACHLOROBENZENE MR No Yes — 0.001 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 1,2-DIBROMO-3-CHLOROPROPANE MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Dec 31, 2016 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2014 Dec 31, 2016 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jul 1, 2013 Jul 31, 2013 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2013 Total Coliform Rule
Jun 1, 2013 Jun 30, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2013 Total Coliform Rule
Jun 1, 2013 Jun 30, 2013 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2013 Total Coliform Rule
Jun 1, 2013 — E. COLI MR No Yes — — — Resolved Aug 21, 2013 Ground Water Rule
Jun 1, 2013 — Public Notice Other No No — — — Resolved Feb 8, 2014 Public Notice Rule and Revised PN Rule
Jul 1, 2012 Sep 30, 2012 Arsenic MCL Yes No .024 MG/L 0.010 mg/L — Resolved Sep 30, 2012 Arsenic Rule
Jul 1, 2012 Sep 30, 2012 Arsenic MCL Yes No .024 MG/L 0.010 mg/L — Resolved Sep 30, 2012 Arsenic Rule
Apr 1, 2012 Jun 30, 2012 Arsenic MR No Yes — 0.010 mg/L — Resolved Jun 30, 2012 Arsenic Rule
Apr 1, 2012 Jun 30, 2012 Arsenic MCL Yes No .024 MG/L 0.010 mg/L — Resolved Jun 30, 2012 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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