Fort Defiance-Window Rock-St Michaels NTUA
Arizona — Community Water System — PWSID: NN0403000
System Information
| PWSID | NN0403000 |
| System Name | Fort Defiance-Window Rock-St Michaels 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 | 12,869 |
| Service Connections | 3,763 |
Drinking Water Violations (248)
This water system has 248 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb 1, 2025 | — | TT | Yes | No | — | — | — | Unaddressed | — | — | |
| Feb 1, 2025 | — | TT | Yes | No | — | — | — | Unaddressed | — | — | |
| Feb 1, 2025 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Jul 1, 2018 | Sep 30, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2018 | — | |
| Jul 1, 2018 | Sep 30, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2018 | — | |
| Apr 1, 2018 | Jun 30, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Jun 30, 2018 | — | |
| Apr 1, 2018 | Jun 30, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Jun 30, 2018 | — | |
| Apr 1, 2018 | Jun 30, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Jun 30, 2018 | — | |
| Apr 1, 2018 | Jun 30, 2018 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Jun 30, 2018 | — | |
| Apr 1, 2018 | Jun 30, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Jun 30, 2018 | — | |
| Apr 1, 2018 | Jun 30, 2018 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Jun 30, 2018 | — | |
| Jan 1, 2018 | Dec 31, 2018 | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2018 | — | |
| Jan 1, 2018 | Dec 31, 2018 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2018 | — | |
| Jan 1, 2017 | Mar 31, 2017 | MCL | Yes | No | .0843 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2017 | — | |
| Jan 1, 2017 | — | Other | No | No | — | — | — | Resolved | May 19, 2017 | — | |
| Jan 1, 2017 | Mar 31, 2017 | MCL | Yes | No | .0843 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2017 | — | |
| Jan 1, 2017 | Mar 31, 2017 | MCL | Yes | No | .0843 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2017 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MCL | Yes | No | .0829 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MCL | Yes | No | .0829 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Oct 1, 2016 | Dec 31, 2016 | MCL | Yes | No | .0829 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jul 1, 2016 | Sep 30, 2016 | MCL | Yes | No | .0932 MG/L | 0.080 mg/L | — | Resolved | Sep 30, 2016 | — | |
| Jul 1, 2016 | Sep 30, 2016 | MCL | Yes | No | .0932 MG/L | 0.080 mg/L | — | Resolved | Sep 30, 2016 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MCL | Yes | No | .1148 MG/L | 0.080 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Sep 30, 2025 | — | |
| Apr 1, 2016 | Jun 30, 2016 | MCL | Yes | No | .1148 MG/L | 0.080 mg/L | — | Resolved | Jun 30, 2016 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Resolved | Sep 30, 2025 | — | |
| Feb 1, 2016 | Feb 29, 2016 | MR | No | No | — | 5% of samples | — | Resolved | Feb 29, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MCL | Yes | No | .1148 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MCL | Yes | No | .1148 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 8, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 8, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 8, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 8, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 8, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 8, 2016 | — | |
| Jan 1, 2016 | Mar 31, 2016 | MCL | Yes | No | .1148 MG/L | 0.080 mg/L | — | Resolved | Mar 31, 2016 | — | |
| Oct 1, 2015 | Dec 31, 2015 | MCL | Yes | No | .1076 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2015 | — | |
| Oct 1, 2015 | — | Other | No | No | — | — | — | Resolved | Jul 1, 2016 | — | |
| Oct 1, 2015 | Dec 31, 2015 | MCL | Yes | No | .1076 MG/L | 0.080 mg/L | — | Resolved | Dec 31, 2015 | — | |
| Oct 1, 2015 | — | Other | No | No | — | — | — | Resolved | Jul 1, 2016 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MCL | Yes | No | .0844 MG/L | 0.080 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | — | Other | No | No | — | — | — | Resolved | Jul 1, 2016 | — | |
| Jul 1, 2015 | — | Other | No | No | — | — | — | Resolved | Jul 1, 2016 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MCL | Yes | No | .0844 MG/L | 0.080 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MCL | Yes | No | .0844 MG/L | 0.080 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2015 | — | |
| Jul 1, 2015 | Sep 30, 2015 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2015 | — |
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.