Fort Defiance-Window Rock-St Michaels NTUA
PWSID: NN0403000 · Ft Defiance, AZ · Serves 12,869 people
According to EPA Safe Drinking Water Information System (SDWIS), Fort Defiance-Window Rock-St Michaels NTUA (PWSID NN0403000) in Ft Defiance, AZ is listed as a CWS water system covering about 12,869 people. The same extract lists 27 health-based violation records spanning 2015-2025. Those 27 health-based rows for Fort Defiance-Window Rock-St Michaels NTUA cover contaminants such as TTHM, Revised Total Coliform Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.
Fort Defiance-Window Rock-St Michaels NTUA has 27 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 2 distinct EPA contaminant codes appear in this system's record, including TTHM, Revised Total Coliform Rule. Recorded violations span 2015–2025. Day-to-day primacy enforcement for this system runs through the Arizona drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Arizona state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- NN0403000
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Ft Defiance, AZ
- Population Served
- 12,869
- Health Violations
- Yes (27)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| TTHM | 26 | 26 |
| Revised Total Coliform Rule | 1 | 1 |
Violation History (27)
| Contaminant | Health | Date |
|---|---|---|
| Revised Total Coliform Rule | Yes | Feb 1, 2025 |
| TTHM | Yes | Oct 1, 2024 |
| TTHM | Yes | Oct 1, 2024 |
| TTHM | Yes | Jan 1, 2017 |
| TTHM | Yes | Jan 1, 2017 |
| TTHM | Yes | Jan 1, 2017 |
| TTHM | Yes | Jan 1, 2017 |
| TTHM | Yes | Oct 1, 2016 |
| TTHM | Yes | Oct 1, 2016 |
| TTHM | Yes | Oct 1, 2016 |
| TTHM | Yes | Oct 1, 2016 |
| TTHM | Yes | Jul 1, 2016 |
| TTHM | Yes | Jul 1, 2016 |
| TTHM | Yes | Jul 1, 2016 |
| TTHM | Yes | Jul 1, 2016 |
| TTHM | Yes | Apr 1, 2016 |
| TTHM | Yes | Apr 1, 2016 |
| TTHM | Yes | Apr 1, 2016 |
| TTHM | Yes | Apr 1, 2016 |
| TTHM | Yes | Jan 1, 2016 |
| TTHM | Yes | Jan 1, 2016 |
| TTHM | Yes | Jan 1, 2016 |
| TTHM | Yes | Jan 1, 2016 |
| TTHM | Yes | Oct 1, 2015 |
| TTHM | Yes | Oct 1, 2015 |
| TTHM | Yes | Oct 1, 2015 |
| TTHM | Yes | Oct 1, 2015 |
Frequently Asked Questions
What does EPA SDWIS list for Fort Defiance-Window Rock-St Michaels NTUA?
How many people does Fort Defiance-Window Rock-St Michaels NTUA serve?
What violations does Fort Defiance-Window Rock-St Michaels NTUA have?
What contaminants have been found in Fort Defiance-Window Rock-St Michaels NTUA water?
Compare beyond Arizona
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest Fort Defiance-Window Rock-St Michaels NTUA on cumulative violation count (27) and EPA-reported population served (12,869). Violation-count peers include COVE WATERWORKS, OLA WATERWORKS, GREEN HILL-BROOKS CHAPEL WATER. Population peers include MACON CO PWSD 1, Cloquet, WEST PLAINS PWS.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Similar population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ gate).
Nearby Water Systems
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About This Data
Fort Defiance-Window Rock-St Michaels NTUA (NN0403000) is drawn from EPA SDWIS. Nearby county systems in this extract include Farmington Rural-Shiprock-Beclabito NTUA; Chinle-Many Farms-Del Muerto NTUA; Tuba City NTUA; Pinon-District 4 NTUA. Health-based rows (27 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.