Chinle WWTF
1 M No Of Ntua Branch Office, Chinle, AZ 86503 · Apache County · Publicly Owned Treatment Works
- Average flow
- 0.24 MGD
- Design flow
- 0.78 MGD
- NPDES permit
- NN0020265
- Effective
- Permit expires
- August 2031
- Population served
- —
- CWNS 2022
Chinle WWTF is a publicly owned wastewater treatment works in Chinle, Apache County, Arizona treating an average of 0.24 million gallons per day against a permitted design capacity of 0.78 MGD. It discharges under NPDES permit NN0020265 (effective), which expires in August 2031, with 160 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in August 2024.
Treatment technology
Treatment structures and unit processes at Chinle WWTF.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 160
- Effluent violations
- 108
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 Chinle WWTF in EPA's ICIS system.
- Formal actions
- 2
- 1 since FY2020
- Compliance actions
- $102M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Aug 2024
NTUA Chinle Wastewater Treatment Lagoon
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $1.7M
EPA's description of the case:
“This is an Administrative Order on Consent (AOC) between the Navajo Tribal Utility Authority (NTUA) and the U.S. EPA to achieve compliance with the Clean Water Act and the Facility's National…”
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Source: EPA ECHO, civil enforcement case 09-2016-1507.
Full case history with a free Klarifi account
Every action against Chinle WWTF with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Chinle WWTF.
No verified contacts on file yet
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Nearby wastewater treatment plants in Arizona
Ganado · 33 mi away
—
Fort Defiance · 47 mi away
0.4 MGD
Kayenta · 52 mi away
0.26 MGD
Holbrook · 95 mi away
—
Tuba City · 95 mi away
0.44 MGD
Winslow · 100 mi away
—
Flagstaff · 134 mi away
2.15 MGD
Grand Canyon · 143 mi away
0.07 MGD
Chinle WWTF: 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 November 3, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms