MAMMOTH TOWN OF
Arizona - Community Water System - PWSID: AZ0411018
System Information
| PWSID | AZ0411018 |
| System Name | MAMMOTH TOWN OF |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Oct 5, 1979 |
| Last Reported | Mar 12, 2026 |
Location & Contact
| State | Arizona |
| City | MAMMOTH |
| ZIP Code | 85618 |
| Address | PO BOX 130 |
| Organization | MORENO, HECTOR |
| Phone | 520-487-2331 |
Population & Service
| Population Served | 1,181 |
| Service Connections | 539 |
Drinking Water Violations (158)
This water system has 158 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 20, 2025 | - | Other | No | No | - | - | - | Resolved | Dec 29, 2025 | - | |
| Nov 16, 2025 | - | Other | No | No | - | - | - | Resolved | Dec 29, 2025 | - | |
| Oct 2, 2025 | - | Other | No | No | - | - | - | Resolved | Oct 10, 2025 | - | |
| Oct 2, 2025 | - | Other | No | No | - | - | - | Resolved | Oct 10, 2025 | - | |
| Jul 2, 2025 | - | RPT | No | No | - | - | - | Unaddressed | - | - | |
| 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 | - | |
| 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 | - | 0.060 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jun 1, 2024 | Jun 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2024 | - | |
| Jun 1, 2024 | Jun 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2024 | - | |
| Oct 2, 2023 | - | Other | No | No | - | - | - | Resolved | Apr 9, 2024 | - | |
| Oct 2, 2023 | - | Other | No | No | - | - | - | Resolved | Apr 9, 2024 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | No | - | 0.060 mg/L | - | Resolved | Sep 30, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | No | - | 0.080 mg/L | - | Resolved | Sep 30, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | No | - | 0.060 mg/L | - | Resolved | Sep 30, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | No | - | 0.060 mg/L | - | Resolved | Sep 30, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | No | - | 0.080 mg/L | - | Resolved | Sep 30, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | No | - | 0.080 mg/L | - | Resolved | Sep 30, 2023 | - | |
| Oct 2, 2021 | - | Other | No | No | - | - | - | Resolved | Oct 7, 2021 | - | |
| Oct 2, 2021 | - | Other | No | No | - | - | - | Resolved | Oct 7, 2021 | - | |
| Apr 1, 2017 | - | RPT | No | No | - | - | - | Resolved | May 15, 2017 | - | |
| Apr 1, 2017 | - | RPT | No | No | - | - | - | Resolved | May 15, 2017 | - | |
| Oct 1, 2016 | - | Other | No | No | - | - | - | Resolved | Oct 21, 2016 | - | |
| Oct 1, 2016 | - | Other | No | No | - | - | - | Resolved | Oct 21, 2016 | - | |
| Jul 1, 2016 | - | Other | No | No | - | - | - | Resolved | Oct 21, 2016 | - | |
| Jul 1, 2016 | Sep 30, 2016 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2016 | - | |
| Jul 1, 2016 | - | Other | No | No | - | - | - | Resolved | Oct 21, 2016 | - | |
| Oct 1, 2014 | Dec 31, 2014 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2014 | - | |
| Oct 1, 2014 | Dec 31, 2014 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2014 | - | |
| Sep 1, 2014 | Sep 30, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2014 | - | |
| Sep 1, 2014 | Sep 30, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2014 | - | |
| Jul 1, 2014 | Sep 30, 2014 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2014 | - | |
| Jul 1, 2014 | Jul 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2014 | - | |
| Jul 1, 2014 | Jul 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2014 | - | |
| Jul 1, 2014 | Sep 30, 2014 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2014 | - | |
| Apr 1, 2014 | Apr 30, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Apr 30, 2014 | - | |
| Apr 1, 2014 | Apr 30, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Apr 30, 2014 | - | |
| Apr 1, 2014 | Jun 30, 2014 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2014 | - | |
| Mar 1, 2014 | Mar 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Mar 31, 2014 | - | |
| Mar 1, 2014 | Mar 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Mar 31, 2014 | - | |
| Jan 1, 2014 | Mar 31, 2014 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2014 | - | |
| Oct 1, 2013 | Dec 31, 2013 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2013 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Jul 1, 2013 | - | Other | No | No | - | - | - | Resolved | Aug 21, 2013 | - | |
| Apr 1, 2013 | Apr 30, 2013 | MR | No | No | - | 5% of samples | - | Resolved | Apr 30, 2013 | - | |
| Apr 1, 2013 | Apr 30, 2013 | MR | No | No | - | 5% of samples | - | Resolved | Apr 30, 2013 | - |
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.