Window Rock Wastewater Treatment Facility
Route 12, Fort Defiance, AZ 86504 · Apache County · Publicly Owned Treatment Works
- Average flow
- 0.4 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- NN0021555
- Administratively continued
- 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 0.4 million gallons per day against a permitted design capacity of 1.2 MGD. It discharges under NPDES permit NN0021555 (administratively continued), which expires in September 2026, with 15 recorded violations in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in September 2023.
Treatment technology
2 treatment structures and unit processes identified at Window Rock Wastewater Treatment Facility.
Available with a free Klarifi account
See the full treatment train at Window Rock Wastewater Treatment Facility: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Window Rock Wastewater Treatment Facility in EPA's ICIS system.
- Formal actions
- 3
- 1 since FY2020
- Compliance actions
- $10M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Sep 2023
NTUA Window Rock WWTF AOC
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty
EPA's description of the case:
“Administrative order on consent requiring steps required to return to compliance with NPDES permit NN0021555.”
Source: EPA ECHO, civil enforcement case 09-2023-1515.
Full case history with a free Klarifi account
Every action against Window Rock Wastewater Treatment Facility with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Window Rock Wastewater Treatment Facility.
No verified contacts on file yet
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Nearby wastewater treatment plants in Arizona
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Chinle · 47 mi away
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Holbrook · 80 mi away
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Winslow · 99 mi away
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Kayenta · 99 mi away
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Tuba City · 128 mi away
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Whiteriver · 134 mi away
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Flagstaff · 147 mi away
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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 October 26, 2026; facility record last updated August 9, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms