LA COSTA WATER USERS ASSOC
Arizona - Community Water System - PWSID: AZ0402041
System Information
| PWSID | AZ0402041 |
| System Name | LA COSTA WATER USERS ASSOC |
| 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 | DOUGLAS |
| ZIP Code | 85607 |
| Address | 244 E. MADRED ST |
| Organization | LEON, ROSANNA |
| Phone | 520-234-7121 |
Population & Service
| Population Served | 30 |
| Service Connections | 16 |
Drinking Water Violations (114)
This water system has 114 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 2, 2025 | - | Other | No | No | - | - | - | Unaddressed | - | - | |
| Jul 1, 2025 | - | Other | No | No | - | - | - | Unaddressed | - | - | |
| Oct 2, 2024 | - | Other | No | No | - | - | - | Resolved | Oct 22, 2024 | - | |
| Oct 2, 2024 | - | Other | No | No | - | - | - | Resolved | Oct 22, 2024 | - | |
| Oct 14, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jan 28, 2024 | - | |
| Oct 14, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jan 28, 2024 | - | |
| Oct 14, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jan 28, 2024 | - | |
| Oct 14, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jan 28, 2024 | - | |
| Jul 1, 2023 | - | Other | No | No | - | - | - | Resolved | Oct 6, 2023 | - | |
| Jul 1, 2023 | - | Other | No | No | - | - | - | Resolved | Oct 6, 2023 | - | |
| Nov 8, 2022 | - | TT | Yes | No | - | - | - | Resolved | Jan 24, 2023 | - | |
| Nov 8, 2022 | - | TT | Yes | No | - | - | - | Resolved | Jan 24, 2023 | - | |
| Nov 8, 2022 | - | TT | Yes | No | - | - | - | Resolved | Jan 24, 2023 | - | |
| Nov 8, 2022 | - | TT | Yes | No | - | - | - | Resolved | Jan 24, 2023 | - | |
| Oct 21, 2022 | - | MR | No | Yes | - | - | - | Unaddressed | - | - | |
| Oct 21, 2022 | - | MR | No | Yes | - | - | - | Unaddressed | - | - | |
| Oct 21, 2022 | - | MR | No | Yes | - | - | - | Unaddressed | - | - | |
| Oct 2, 2022 | - | Other | No | No | - | - | - | Resolved | Sep 14, 2023 | - | |
| Oct 2, 2022 | - | Other | No | No | - | - | - | Resolved | Sep 14, 2023 | - | |
| Jul 1, 2022 | - | Other | No | No | - | - | - | Resolved | Sep 14, 2023 | - | |
| Jul 1, 2022 | - | Other | No | No | - | - | - | Resolved | Sep 14, 2023 | - | |
| Jun 3, 2021 | - | MR | No | Yes | - | - | - | Resolved | Jun 8, 2021 | - | |
| Jun 3, 2021 | - | MR | No | Yes | - | - | - | Resolved | Jun 8, 2021 | - | |
| Feb 26, 2021 | - | Other | No | No | - | - | - | Resolved | Jul 26, 2022 | - | |
| Feb 26, 2021 | - | Other | No | No | - | - | - | Resolved | Jul 26, 2022 | - | |
| Jan 1, 2021 | - | MR | No | No | - | TT | - | Resolved | Oct 22, 2021 | - | |
| Jan 1, 2021 | - | MR | No | No | - | TT | - | Resolved | Oct 22, 2021 | - | |
| Jan 1, 2021 | - | MR | No | No | - | TT | - | Resolved | Oct 22, 2021 | - | |
| Nov 1, 2020 | - | RPT | No | No | - | - | - | Resolved | Dec 30, 2020 | - | |
| Nov 1, 2020 | - | RPT | No | No | - | - | - | Resolved | Dec 30, 2020 | - | |
| Oct 1, 2020 | - | MR | No | No | - | TT | - | Resolved | Oct 26, 2020 | - | |
| Oct 1, 2018 | - | Other | No | No | - | - | - | Resolved | Nov 9, 2018 | - | |
| Oct 1, 2015 | - | Other | No | No | - | - | - | Resolved | Nov 22, 2015 | - | |
| Jul 1, 2015 | - | Other | No | No | - | - | - | Resolved | Oct 7, 2015 | - | |
| Dec 1, 2014 | Dec 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2014 | - | |
| Dec 1, 2014 | Dec 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2014 | - | |
| Oct 1, 2014 | - | MR | No | No | - | TT | - | Resolved | Dec 5, 2014 | - | |
| Oct 1, 2014 | - | MR | No | No | - | TT | - | Resolved | Dec 5, 2014 | - | |
| Oct 1, 2012 | - | Other | No | No | - | - | - | Resolved | Sep 12, 2013 | - | |
| Jul 1, 2012 | - | Other | No | No | - | - | - | Resolved | Jul 3, 2013 | - | |
| Oct 1, 2011 | - | Other | No | No | - | - | - | Resolved | Sep 12, 2013 | - | |
| Jul 1, 2011 | - | Other | No | No | - | - | - | Resolved | Jul 3, 2013 | - | |
| Oct 1, 2010 | - | Other | No | No | - | - | - | Resolved | Sep 12, 2013 | - | |
| Jul 1, 2010 | - | Other | No | No | - | - | - | Resolved | Jul 3, 2013 | - | |
| Jul 1, 2009 | - | Other | No | No | - | - | - | Resolved | Jul 20, 2009 | - | |
| Aug 1, 2008 | Aug 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2008 | - | |
| Aug 1, 2008 | Aug 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Nov 3, 2008 | - | |
| Apr 1, 2008 | Jun 30, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2008 | - | |
| Jan 1, 2008 | Mar 31, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2008 | - |
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.