Fort Defiance-Window Rock-St Michaels NTUA
PWSID: NN0403000 · Ft Defiance, AZ · Serves 12,869 people
Fort Defiance-Window Rock-St Michaels NTUA has 27 health-based violations out of 27 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
Fort Defiance-Window Rock-St Michaels NTUA (PWSID NN0403000) is a cws water system drawing from a groundwater source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 12,869 people in Ft Defiance, AZ, and is subject to primacy enforcement by the Arizona drinking-water program.
The system's federal compliance record contains 27 total violations, with 27 classified as health-based (MCL exceedances or treatment-technique failures). 2 distinct contaminants have been cited, including Total Trihalomethanes (TTHM), E. coli. Recorded violations span 2015–2025.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time 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 |
|---|---|---|
| Total Trihalomethanes (TTHM) | 26 | 26 |
| E. coli | 1 | 1 |
Violation History (27)
Frequently Asked Questions
Is Fort Defiance-Window Rock-St Michaels NTUA water safe to drink?
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?
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.