Mexican Hat NTUA
Arizona — Community Water System — PWSID: NN4903032
System Information
| PWSID | NN4903032 |
| System Name | Mexican Hat 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 | 239 |
| Service Connections | 70 |
Drinking Water Violations (33)
This water system has 33 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2020 | Dec 31, 2020 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2020 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2020 | Dec 31, 2020 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2020 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2020 | Dec 31, 2020 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2020 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2020 | Dec 31, 2020 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2020 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2020 | Dec 31, 2020 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2020 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2020 | Dec 31, 2020 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2020 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Apr 1, 2016 | — | Revised Total Coliform Rule | Other | No | No | — | — | — | Unaddressed | — | Revised 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 |
| Nov 1, 2011 | Nov 30, 2011 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2011 | Total Coliform Rule |
| Sep 1, 2011 | Sep 30, 2011 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | Total Coliform Rule |
| Sep 1, 2011 | Sep 30, 2011 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | Total Coliform Rule |
| Sep 1, 2011 | Sep 30, 2011 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | Total Coliform Rule |
| Jan 1, 2011 | Dec 31, 2013 | 2,3,7,8-TCDD | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | May 15, 2012 | Synthetic Organic Chemicals |
| Jan 1, 2011 | Dec 31, 2013 | Total Polychlorinated Biphenyls (PCB) | MR | No | Yes | — | 0.0005 mg/L | — | Resolved | May 15, 2012 | Synthetic Organic Chemicals |
| Oct 1, 2010 | Dec 31, 2010 | Fluoride | MCL | Yes | No | 140 MG/L | 4.0 mg/L | — | Resolved | Jul 21, 2008 | Inorganic Chemicals |
| Jan 1, 2010 | Dec 31, 2010 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2010 | Dec 31, 2010 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2010 | Dec 31, 2010 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2010 | Dec 31, 2010 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2010 | Dec 31, 2010 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2010 | Dec 31, 2010 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts 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.