Mariano Lake-Pinedale-Church Rock NTUA
Arizona — Community Water System — PWSID: NN3500211
System Information
| PWSID | NN3500211 |
| System Name | Mariano Lake-Pinedale-Church Rock 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 | 4,562 |
| Service Connections | 1,334 |
Drinking Water Violations (108)
This water system has 108 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, 2021 | Dec 31, 2021 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2021 | — | |
| 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, 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 | — | 4.0 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Jan 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2020 | — | |
| Apr 1, 2017 | Apr 30, 2017 | MON | No | Yes | — | — | — | Resolved | Apr 30, 2017 | — | |
| Apr 1, 2017 | Apr 30, 2017 | MON | No | Yes | — | — | — | Resolved | Apr 30, 2017 | — | |
| Apr 1, 2017 | Apr 30, 2017 | MON | No | Yes | — | — | — | Resolved | Apr 30, 2017 | — | |
| Mar 1, 2017 | Mar 31, 2017 | MON | No | Yes | — | — | — | Resolved | Mar 31, 2017 | — | |
| Mar 1, 2017 | Mar 31, 2017 | MON | No | Yes | — | — | — | Resolved | Mar 31, 2017 | — | |
| Mar 1, 2017 | Mar 31, 2017 | MON | No | Yes | — | — | — | Resolved | Mar 31, 2017 | — | |
| Feb 1, 2017 | Feb 28, 2017 | MON | No | Yes | — | — | — | Resolved | Feb 28, 2017 | — | |
| Feb 1, 2017 | Feb 28, 2017 | MON | No | Yes | — | — | — | Resolved | Feb 28, 2017 | — | |
| Feb 1, 2017 | Feb 28, 2017 | MON | No | Yes | — | — | — | Resolved | Feb 28, 2017 | — | |
| Jan 1, 2017 | Jan 31, 2017 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2017 | — | |
| Jan 1, 2017 | Jan 31, 2017 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2017 | — | |
| Jan 1, 2017 | Jan 31, 2017 | MON | No | Yes | — | — | — | Resolved | Jan 31, 2017 | — | |
| Apr 1, 2016 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.02 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.00000003 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Sep 30, 2013 | — | |
| Jul 1, 2013 | Sep 30, 2013 | MR | No | Yes | — | 0.7 mg/L | — | Resolved | Sep 30, 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 | — | |
| Nov 1, 2012 | Nov 30, 2012 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2012 | — | |
| Feb 1, 2012 | Feb 29, 2012 | MR | No | No | — | 5% of samples | — | Resolved | Feb 29, 2012 | — | |
| Feb 1, 2012 | Feb 29, 2012 | MR | No | No | — | 5% of samples | — | Resolved | Feb 29, 2012 | — | |
| Feb 1, 2012 | Feb 29, 2012 | MR | No | No | — | 5% of samples | — | Resolved | Feb 29, 2012 | — | |
| Oct 1, 2010 | Dec 31, 2010 | MCL | Yes | No | .0004 MG/L | 0.0002 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2010 | Dec 31, 2010 | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.6 mg/L | — | Resolved | Dec 31, 2010 | — |
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.