Nezperce WWTP
2480 Id-162, Nezperce, ID 83543 · Lewis County · Publicly Owned Treatment Works
- Average flow
- 0.008 MGD
- 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 treating an average of 0.008 million gallons per day against a permitted design capacity of 0.09 MGD, serving about 529 residents. It discharges under NPDES permit ID0020397 (administratively continued), which expires in July 2024, with 30 recorded violations in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in December 2017.
Treatment technology
One treatment structure or unit process identified at Nezperce WWTP.
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See the full treatment train at Nezperce WWTP: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Nezperce WWTP in EPA's ICIS system.
- Formal actions
- 3
- 0 since FY2020
- Penalties assessed
- $6,500
- all cases
- Compliance actions
- $506,700
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Dec 2017
CITY OF NEZPERCE WWTP - PENALTY ORDER
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $6,500 · Compliance actions $4,700
EPA's description of the case:
“On December 4, 2017, Region 10 filed a consent agreement and final order resolving violations of the Clean Water Act by the City of Nezperce, Idaho. Respondent, which operates a wastewater treatment…”
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Source: EPA ECHO, civil enforcement case 10-2018-0004.
Full case history with a free Klarifi account
Every action against Nezperce WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Nezperce WWTP.
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Nearby wastewater treatment plants in Idaho
Kamiah · 10 mi away
0.16 MGD
Craigmont · 10 mi away
0.3 MGD
Cottonwood · 14 mi away
0.22 MGD
Kooskia · 15 mi away
—
Weippe · 17 mi away
0.27 MGD
Winchester · 18 mi away
0.01 MGD
Orofino · 18 mi away
0.02 MGD
Orofino · 19 mi away
0.28 MGD
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 October 26, 2026; facility record last updated January 23, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms