Nezperce WWTP
Nezperce, ID · Lewis County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.09 MGD
- NPDES permit
- ID0020397
- Administratively continued
- Permit expires
- July 2024
- Population served
- 529
- CWNS 2022
Nezperce WWTP is a publicly owned wastewater treatment works in Nezperce, Lewis County, Idaho, serving about 529 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ID0020397 (administratively continued), which expires in July 2024, with 30 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 30
- Effluent violations
- 30
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Nezperce WWTP.
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Kooskia · 15 mi away
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Weippe · 17 mi away
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Winchester · 18 mi away
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Orofino · 18 mi away
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Orofino · 19 mi away
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Nezperce 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 January 23, 2025.