Inscription House-Navajo Mountain NTUA
Arizona — Community Water System — PWSID: NN0400283
System Information
| PWSID | NN0400283 |
| System Name | Inscription House-Navajo Mountain NTUA |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Native American |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | Yes |
| 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 | 1,368 |
| Service Connections | 400 |
Drinking Water Violations (174)
This water system has 174 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr 1, 2016 | — | Revised Total Coliform Rule | Other | No | No | — | — | — | Unaddressed | — | Revised Total Coliform Rule |
| Oct 1, 2013 | — | Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | No | Yes | — | — | — | Unaddressed | — | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| May 1, 2013 | May 31, 2013 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | May 31, 2013 | Total Coliform Rule |
| May 1, 2013 | May 31, 2013 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | May 31, 2013 | Total Coliform Rule |
| Dec 1, 2012 | Dec 31, 2012 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2012 | Total Coliform Rule |
| Dec 1, 2012 | Dec 31, 2012 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2012 | Total Coliform Rule |
| Nov 1, 2012 | Nov 30, 2012 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2012 | Total Coliform Rule |
| Jan 1, 2010 | Dec 31, 2010 | Nitrite | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2010 | Nitrate Rule |
| Jan 1, 2005 | Dec 31, 2005 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2005 | Nitrate Rule |
| Jul 31, 1996 | Aug 30, 1996 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Aug 30, 1996 | Total Coliform Rule |
| Jul 31, 1996 | Aug 30, 1996 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 30, 1996 | Total Coliform Rule |
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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.