Kooskia WWTP
4 Airport Rd, Kooskia, ID 83539 · Idaho County · Publicly Owned Treatment Works
- Average flow
- —
- 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, serving about 685 residents. It discharges under NPDES permit ID0021814 (administratively continued), which expires in December 2024, with 21 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in December 2006.
Treatment technology
One treatment structure or unit process identified at Kooskia WWTP.
Available with a free Klarifi account
See the full treatment train at Kooskia WWTP: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Kooskia WWTP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $3,500
- all cases
- Compliance actions
- $70,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Dec 2006
CITY OF KOOSKIA
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $3,500 · Compliance actions $70,000
EPA's description of the case:
“Respondent is in violation of its NPDES permit authorized under Section 402 of CWA. Violations include exceedances of the effluent limits for cholorine and E.Coli.”
Source: EPA ECHO, civil enforcement case 10-2006-0278.
Full case history with a free Klarifi account
Every action against Kooskia WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Kooskia WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Idaho
Kamiah · 7 mi away
0.16 MGD
Nezperce · 15 mi away
0.008 MGD
Grangeville · 15 mi away
0.42 MGD
Weippe · 17 mi away
0.27 MGD
Cottonwood · 18 mi away
0.22 MGD
Craigmont · 24 mi away
0.3 MGD
Pierce · 26 mi away
0.17 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 October 26, 2026; facility record last updated November 5, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms