Kooskia WWTP
Kooskia, ID · Idaho County · Publicly Owned Treatment Works
- Average flow
- 0.11 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- ID0021814
- Administratively continued
- Permit expires
- December 2024
- Population served
- 685
- CWNS 2022
Kooskia WWTP is a publicly owned wastewater treatment works in Kooskia, Idaho County, Idaho treating an average of 0.11 million gallons per day against a permitted design capacity of 0.2 MGD, serving about 685 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit ID0021814 (administratively continued), which expires in December 2024, with 21 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 21
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Kooskia WWTP.
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Nearby wastewater treatment plants in Idaho
Kamiah · 7 mi away
0.12 MGD
Nezperce · 15 mi away
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Grangeville · 15 mi away
0.39 MGD
Weippe · 17 mi away
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Cottonwood · 18 mi away
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Craigmont · 24 mi away
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Pierce · 26 mi away
0.05 MGD
Orofino · 30 mi away
0.02 MGD
Kooskia WWTP: 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 November 5, 2025.