Window Rock Wastewater Treatment Facility
Fort Defiance, AZ · Apache County · Publicly Owned Treatment Works
- Average flow
- 0.39 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- NN0021555
- Effective
- Permit expires
- September 2026
- Population served
- —
- CWNS 2022
Window Rock Wastewater Treatment Facility is a publicly owned wastewater treatment works in Fort Defiance, Apache County, Arizona treating an average of 0.39 million gallons per day against a permitted design capacity of 1.2 MGD. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit NN0021555 (effective), which expires in September 2026, with 15 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 15
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Window Rock Wastewater Treatment Facility.
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Window Rock Wastewater Treatment Facility: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 9, 2026.