Toadlena NTUA
Arizona — Community Water System — PWSID: NN3503028
System Information
| PWSID | NN3503028 |
| System Name | Toadlena NTUA |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Native American |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 2, 1984 |
| Last Reported | Dec 31, 2025 |
Location & Contact
| State | Arizona |
| City | Ft Defiance |
| ZIP Code | 86504 |
| Address | Office of Deputy General Manager |
| Organization | Navajo Tribal Utility Authority |
| Phone | 9287296277 |
Population & Service
| Population Served | 903 |
| Service Connections | 264 |
Drinking Water Violations (197)
This water system has 197 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 | Sep 30, 2025 | MCL | Yes | No | .0127 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2025 | — | |
| Apr 1, 2025 | Jun 30, 2025 | MCL | Yes | No | .01165 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2025 | — | |
| Apr 1, 2025 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Jan 1, 2025 | Mar 31, 2025 | MCL | Yes | No | .01263 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2025 | — | |
| Oct 1, 2024 | Dec 31, 2024 | MCL | Yes | No | .01273 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2024 | — | |
| Oct 1, 2024 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Jul 1, 2024 | — | Other | No | No | — | — | — | Resolved | Aug 6, 2024 | — | |
| Jul 1, 2024 | Sep 30, 2024 | MCL | Yes | No | .01363 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2024 | — | |
| Apr 1, 2024 | — | Other | No | No | — | — | — | Resolved | Apr 11, 2024 | — | |
| Apr 1, 2024 | Jun 30, 2024 | MCL | Yes | No | .01488 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2024 | — | |
| Jan 1, 2024 | Mar 31, 2024 | MCL | Yes | No | .01428 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2024 | — | |
| Oct 1, 2023 | Dec 31, 2023 | MCL | Yes | No | .0151 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2023 | — | |
| Jul 1, 2023 | Sep 30, 2023 | MCL | Yes | No | .0145 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2023 | — | |
| Apr 1, 2023 | Jun 30, 2023 | MCL | Yes | No | .0135 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2023 | — | |
| Jan 1, 2023 | Mar 31, 2023 | MCL | Yes | No | .0133 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2023 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MCL | Yes | No | .0128 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2022 | — | |
| Jul 1, 2022 | Sep 30, 2022 | MCL | Yes | No | .0115 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2022 | — | |
| Apr 1, 2022 | Jun 30, 2022 | MCL | Yes | No | .0119 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2022 | — | |
| Apr 1, 2022 | — | Other | No | No | — | — | — | Resolved | Apr 7, 2022 | — | |
| Jan 1, 2022 | Mar 31, 2022 | MCL | Yes | No | .0135 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2022 | — | |
| Jan 1, 2022 | Mar 31, 2022 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Mar 31, 2022 | — | |
| Oct 1, 2021 | Dec 31, 2021 | MCL | Yes | No | .0157 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2021 | — | |
| Jul 1, 2021 | Sep 30, 2021 | MCL | Yes | No | .0175 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2021 | — | |
| Apr 1, 2021 | — | Other | No | No | — | — | — | Resolved | Jul 14, 2021 | — | |
| Apr 1, 2021 | Jun 30, 2021 | MCL | Yes | No | .0178 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2021 | — | |
| Jan 1, 2021 | Mar 31, 2021 | MCL | Yes | No | .0177 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2021 | — | |
| Oct 1, 2020 | Dec 31, 2020 | MCL | Yes | No | .0156 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2020 | — | |
| Jul 1, 2020 | Sep 30, 2020 | MCL | Yes | No | .0146 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2020 | — | |
| Apr 1, 2020 | Jun 30, 2020 | MCL | Yes | No | .0149 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2020 | — | |
| Apr 1, 2020 | — | Other | No | No | — | — | — | Resolved | Apr 3, 2020 | — | |
| Apr 1, 2020 | — | Other | No | No | — | — | — | Resolved | Apr 3, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Mar 31, 2020 | MCL | Yes | No | .0149 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Oct 1, 2019 | Dec 31, 2019 | MCL | Yes | No | .0148 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jul 1, 2019 | Sep 30, 2019 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2019 | — | |
| Jul 1, 2019 | Sep 30, 2019 | MCL | Yes | No | .0153 MG/L | 0.010 mg/L | — | Archived | Sep 30, 2019 | — | |
| Jul 1, 2019 | Sep 30, 2019 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2019 | — | |
| Jul 1, 2019 | Sep 30, 2019 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2019 | — | |
| Apr 1, 2019 | Jun 30, 2019 | MCL | Yes | No | .0146 MG/L | 0.010 mg/L | — | Archived | Jun 30, 2019 | — | |
| Apr 1, 2019 | Jun 30, 2019 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Jun 30, 2019 | — | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Feb 12, 2019 | — | |
| Jan 1, 2019 | Mar 31, 2019 | MCL | Yes | No | .0147 MG/L | 0.010 mg/L | — | Archived | Mar 31, 2019 | — | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Feb 12, 2019 | — | |
| Oct 1, 2018 | Dec 31, 2018 | MCL | Yes | No | .0147 MG/L | 0.010 mg/L | — | Archived | Dec 31, 2018 | — | |
| Oct 1, 2018 | — | Other | No | No | — | — | — | Resolved | Dec 17, 2018 | — |
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.