Navajo Mountain Community Boarding School BIA
Arizona — Community Water System — PWSID: NN4933011
System Information
| PWSID | NN4933011 |
| System Name | Navajo Mountain Community Boarding School BIA |
| System Type | Community Water System |
| Water Source | Ground Water Purchased |
| Activity Status | Active |
| Owner Type | Federal |
| EPA Region | 09 |
| Serves School | Yes |
| Wholesaler | No |
| First Reported | Feb 2, 1984 |
| Last Reported | Dec 31, 2025 |
Location & Contact
| State | Arizona |
| City | Tonalea |
| ZIP Code | 86044 |
| Address | PO Box 10010 |
| Organization | BIA NaaTsis'Aan Community School |
| Phone | 9286722335 |
Population & Service
| Population Served | 163 |
| Service Connections | 17 |
Drinking Water Violations (88)
This water system has 88 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, 2024 | — | Other | No | No | — | — | — | Resolved | Jul 29, 2025 | — | |
| Jul 1, 2024 | — | Other | No | No | — | — | — | Resolved | Jul 29, 2025 | — | |
| Mar 1, 2024 | Mar 31, 2024 | MON | No | Yes | — | — | — | Resolved | Mar 31, 2024 | — | |
| Feb 1, 2024 | Feb 29, 2024 | MON | No | Yes | — | — | — | Resolved | Feb 29, 2024 | — | |
| Jan 1, 2024 | Jan 31, 2024 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2024 | — | |
| Oct 1, 2023 | — | RPT | No | No | — | — | — | Resolved | Nov 30, 2023 | — | |
| Oct 1, 2022 | — | RPT | No | No | — | — | — | Resolved | Nov 17, 2022 | — | |
| Dec 1, 2020 | — | RPT | No | No | — | — | — | Resolved | Jan 26, 2021 | — | |
| May 1, 2020 | — | RPT | No | No | — | — | — | Resolved | Jun 19, 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 | — | 0.080 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 | — | 0.060 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, 2018 | Mar 31, 2018 | MCL | Yes | No | .0902 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MCL | Yes | No | .0902 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MCL | Yes | No | .0902 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | — | Other | No | No | — | — | — | Resolved | Jun 30, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Jan 1, 2018 | Mar 31, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 31, 2018 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | — | Other | No | No | — | — | — | Resolved | Jun 30, 2018 | — | |
| Oct 1, 2017 | — | Other | No | No | — | — | — | Resolved | Jun 30, 2018 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MCL | Yes | No | .0902 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MCL | Yes | No | .0902 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MCL | Yes | No | .0902 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Oct 1, 2017 | Dec 31, 2017 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2017 | — | |
| Jan 1, 2017 | — | MR | No | No | — | TT | — | Resolved | Jun 21, 2017 | — | |
| Jan 1, 2017 | — | MR | No | No | — | TT | — | Resolved | Jun 21, 2017 | — | |
| Jan 1, 2017 | — | MR | No | No | — | TT | — | Resolved | Jun 21, 2017 | — | |
| Jul 1, 2016 | — | MR | No | No | — | TT | — | Resolved | Dec 20, 2016 | — | |
| Jul 1, 2016 | — | MR | No | No | — | TT | — | Resolved | Dec 20, 2016 | — | |
| Jul 1, 2016 | — | MR | No | No | — | TT | — | Resolved | Dec 20, 2016 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Oct 4, 2018 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Oct 4, 2018 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Oct 4, 2018 | — | |
| Jul 1, 2015 | Jul 31, 2015 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2015 | — | |
| Jul 1, 2015 | Jul 31, 2015 | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2015 | — | |
| Oct 1, 2013 | — | MR | No | Yes | — | — | — | Resolved | Oct 4, 2018 | — | |
| Oct 1, 2013 | — | MR | No | Yes | — | — | — | Resolved | Oct 4, 2018 | — | |
| Oct 1, 2013 | — | MR | No | Yes | — | — | — | Resolved | Oct 4, 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.