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AJO IMPROVEMENT COMPANY

Arizona — Community Water System — PWSID: AZ0410001

System Information

PWSIDAZ0410001
System NameAJO IMPROVEMENT COMPANY
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeMixed
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedOct 5, 1979
Last ReportedNov 17, 2025

Location & Contact

StateArizona
CityAJO
ZIP Code85321
Address—
OrganizationLANE, JOHN
Phone520-387-2016

Population & Service

Population Served2,654
Service Connections1,200

Drinking Water Violations (76)

This water system has 76 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
Nov 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 30, 2024 Revised Total Coliform Rule
Nov 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 30, 2024 Revised Total Coliform Rule
Oct 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 5, 2024 Revised Total Coliform Rule
Oct 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 5, 2024 Revised Total Coliform Rule
Sep 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Oct 11, 2024 Revised Total Coliform Rule
Sep 1, 2024 — Revised Total Coliform Rule RPT No No — — — Resolved Oct 11, 2024 Revised Total Coliform Rule
Jul 1, 2024 Sep 30, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2023 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2023 Jun 30, 2023 Arsenic MR No Yes — 0.010 mg/L — Resolved Jun 30, 2023 Arsenic Rule
Apr 1, 2023 Jun 30, 2023 Arsenic MR No Yes — 0.010 mg/L — Resolved Jun 30, 2023 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 Mar 31, 2022 Arsenic MR No Yes — 0.010 mg/L — Resolved Mar 31, 2022 Arsenic Rule
Jul 1, 2021 Sep 30, 2021 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2021 Arsenic Rule
Jul 1, 2021 Sep 30, 2021 Arsenic MR No Yes — 0.010 mg/L — Resolved Sep 30, 2021 Arsenic Rule
Jul 1, 2020 Sep 30, 2020 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2020 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2020 Sep 30, 2020 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2020 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Aug 31, 2019 TTHM MR No Yes — 0.080 mg/L — Resolved Aug 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Aug 31, 2019 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Aug 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Aug 31, 2019 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Aug 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Aug 31, 2019 TTHM MR No Yes — 0.080 mg/L — Resolved Aug 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2018 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2018 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2016 Apr 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2016 Revised Total Coliform Rule
Apr 1, 2016 Apr 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2016 Revised Total Coliform Rule
Jul 1, 2015 — Consumer Confidence Rule Other No No — — — Resolved Jul 13, 2015 Consumer Confidence Rule
Oct 1, 2013 Dec 31, 2013 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2013 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2008 Dec 31, 2008 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2008 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2008 Dec 31, 2008 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2008 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2008 Dec 31, 2008 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2008 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2008 Dec 31, 2008 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2008 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2007 Dec 31, 2007 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2007 Mar 31, 2007 Chlorine MR No Yes — 4.0 mg/L — Resolved Mar 31, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2007 Mar 31, 2007 Chlorine MR No Yes — 4.0 mg/L — Resolved Mar 31, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2007 Dec 31, 2007 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2006 Jun 30, 2006 Chlorine MR No Yes — 4.0 mg/L — Resolved Jun 30, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2006 Dec 31, 2006 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2006 Mar 31, 2006 Chlorine MR No Yes — 4.0 mg/L — Resolved Mar 31, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2006 Dec 31, 2006 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2005 — Lead and Copper Rule MR No No — TT — Resolved Apr 10, 2008 Lead and Copper Rule
Oct 1, 2005 Dec 31, 2005 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts 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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