AJO IMPROVEMENT COMPANY
Arizona — Community Water System — PWSID: AZ0410001
System Information
| PWSID | AZ0410001 |
| System Name | AJO IMPROVEMENT COMPANY |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Mixed |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Oct 5, 1979 |
| Last Reported | Mar 12, 2026 |
Location & Contact
| State | Arizona |
| City | AJO |
| ZIP Code | 85321 |
| Address | — |
| Organization | LANE, JOHN |
| Phone | 520-387-2016 |
Population & Service
| Population Served | 2,654 |
| Service Connections | 1,200 |
Drinking Water Violations (85)
This water system has 85 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 | — | RPT | No | No | — | — | — | Resolved | Dec 30, 2024 | — | |
| Nov 1, 2024 | — | RPT | No | No | — | — | — | Resolved | Dec 30, 2024 | — | |
| Oct 1, 2024 | — | RPT | No | No | — | — | — | Resolved | Dec 5, 2024 | — | |
| Oct 1, 2024 | — | RPT | No | No | — | — | — | Resolved | Dec 5, 2024 | — | |
| Sep 1, 2024 | — | RPT | No | No | — | — | — | Resolved | Oct 11, 2024 | — | |
| Sep 1, 2024 | — | RPT | No | No | — | — | — | Resolved | Oct 11, 2024 | — | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2024 | — | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2024 | — | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2024 | — | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2024 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Apr 1, 2023 | Jun 30, 2023 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Jun 30, 2023 | — | |
| Apr 1, 2023 | Jun 30, 2023 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Jun 30, 2023 | — | |
| Jan 1, 2022 | Mar 31, 2022 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Mar 31, 2022 | — | |
| Jan 1, 2022 | Mar 31, 2022 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Mar 31, 2022 | — | |
| Jul 1, 2021 | Sep 30, 2021 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2021 | — | |
| Jul 1, 2021 | Sep 30, 2021 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2021 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2020 | — | |
| Jan 1, 2019 | Aug 31, 2019 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Aug 31, 2019 | — | |
| Jan 1, 2019 | Aug 31, 2019 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Aug 31, 2019 | — | |
| Jan 1, 2019 | Aug 31, 2019 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Aug 31, 2019 | — | |
| Jan 1, 2019 | Aug 31, 2019 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Aug 31, 2019 | — | |
| Jul 1, 2018 | Sep 30, 2018 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2018 | — | |
| Jul 1, 2018 | Sep 30, 2018 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2018 | — | |
| Apr 1, 2016 | Apr 30, 2016 | MON | No | Yes | — | — | — | Resolved | Apr 30, 2016 | — | |
| Apr 1, 2016 | Apr 30, 2016 | MON | No | Yes | — | — | — | Resolved | Apr 30, 2016 | — | |
| Jul 1, 2015 | — | Other | No | No | — | — | — | Resolved | Jul 13, 2015 | — | |
| Oct 1, 2013 | Dec 31, 2013 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2013 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2007 | Dec 31, 2007 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2007 | — | |
| Jan 1, 2007 | Dec 31, 2007 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2007 | — | |
| Jan 1, 2007 | Mar 31, 2007 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Mar 31, 2007 | — | |
| Jan 1, 2007 | Mar 31, 2007 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Mar 31, 2007 | — | |
| Apr 1, 2006 | Jun 30, 2006 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Jun 30, 2006 | — | |
| Jan 1, 2006 | Mar 31, 2006 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Mar 31, 2006 | — | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2006 | — | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2006 | — | |
| Oct 1, 2005 | — | MR | No | No | — | TT | — | Resolved | Apr 10, 2008 | — | |
| Oct 1, 2005 | Dec 31, 2005 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2005 | — |
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.