Dennehotso Boarding School BIA
Arizona — Community Water System — PWSID: NN0433004
System Information
| PWSID | NN0433004 |
| System Name | Dennehotso Boarding School BIA |
| System Type | Community Water System |
| Water Source | Ground Water |
| 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 | Dennehotso |
| ZIP Code | 86535 |
| Address | PO Box 2570 |
| Organization | BIA Dennehotso Boarding School |
| Phone | 9286583204 |
Population & Service
| Population Served | 300 |
| Service Connections | 32 |
Drinking Water Violations (101)
This water system has 101 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 1, 2024 | — | |
| Jan 1, 2024 | — | RPT | No | No | — | — | — | Resolved | Feb 20, 2024 | — | |
| Oct 1, 2023 | — | RPT | No | No | — | — | — | Resolved | Nov 30, 2023 | — | |
| Oct 1, 2022 | — | RPT | No | No | — | — | — | Resolved | Nov 17, 2022 | — | |
| May 1, 2020 | — | RPT | No | No | — | — | — | Resolved | Jun 19, 2020 | — | |
| Aug 1, 2016 | — | MR | No | Yes | — | — | — | Resolved | Aug 3, 2016 | — | |
| Aug 1, 2016 | — | MR | No | Yes | — | — | — | Resolved | Aug 3, 2016 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Oct 3, 2018 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Oct 3, 2018 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Oct 3, 2018 | — | |
| Oct 1, 2013 | — | MR | No | Yes | — | — | — | Resolved | Oct 3, 2018 | — | |
| Oct 1, 2013 | — | MR | No | Yes | — | — | — | Resolved | Oct 3, 2018 | — | |
| Oct 1, 2013 | — | MR | No | Yes | — | — | — | Resolved | Oct 3, 2018 | — | |
| May 1, 2013 | May 31, 2013 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2013 | — | |
| Dec 1, 2012 | Dec 31, 2012 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2012 | — | |
| Dec 1, 2012 | Dec 31, 2012 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2012 | — | |
| Oct 1, 2010 | Dec 31, 2010 | MCL | Yes | No | .015 MG/L | 0.010 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2010 | Dec 31, 2010 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2010 | Dec 31, 2010 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2010 | Dec 31, 2010 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2010 | Dec 31, 2010 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2010 | Dec 31, 2010 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jul 1, 2006 | — | Other | No | No | — | — | — | Resolved | Mar 9, 2007 | — | |
| Jul 1, 2006 | — | Other | No | No | — | — | — | Resolved | Mar 9, 2007 | — | |
| Jul 1, 2005 | — | Other | No | No | — | — | — | Resolved | Mar 9, 2007 | — | |
| Jul 1, 2005 | — | Other | No | No | — | — | — | Resolved | Mar 9, 2007 | — | |
| Jan 1, 2005 | Dec 31, 2010 | MR | No | Yes | — | 15 pCi/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2005 | Dec 31, 2010 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2005 | Dec 31, 2010 | MR | No | Yes | — | 30 ug/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.002 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.2 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.1 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.006 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.5 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.05 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | — | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.003 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | — | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.00000003 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.07 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.05 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.001 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.07 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.0005 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.0002 mg/L | — | Resolved | Dec 31, 2004 | — | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | No | — | 0.00005 mg/L | — | Resolved | Dec 31, 2004 | — |
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.