Elk River STP
Landing Rd, Elk River, ID 83827 · Clearwater County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.08 MGD
- NPDES permit
- ID0020362
- Administratively continued
- Permit expires
- August 2023
- Population served
- 136
- CWNS 2022
Elk River STP is a publicly owned wastewater treatment works in Elk River, Clearwater County, Idaho treating an average of 0.06 million gallons per day against a permitted design capacity of 0.08 MGD, serving about 136 residents. It discharges under NPDES permit ID0020362 (administratively continued), which expires in August 2023, with 1 recorded violation in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in September 2016.
Treatment technology
2 treatment structures and unit processes identified at Elk River STP.
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See the full treatment train at Elk River STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
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 Elk River STP in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $5,659
- all cases
- Compliance actions
- $11,947
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Sep 2016
CITY OF ELK RIVER, WASTEWATER TREATMENT PLANT
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $4,659 · Compliance actions $1,287
EPA's description of the case:
“On August 30, 2016, Region 10 filed a consent agreement and final order resolving violations of the Clean Water Act by the City of Elk River. Respondent, which operates a wastewater treatment…”
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Source: EPA ECHO, civil enforcement case 10-2016-0126.
Full case history with a free Klarifi account
Every action against Elk River STP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Elk River STP.
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Nearby wastewater treatment plants in Idaho
Deary · 12 mi away
0.05 MGD
Deary · 19 mi away
0.14 MGD
Orofino · 21 mi away
0.02 MGD
Orofino · 21 mi away
0.28 MGD
Fernwood · 26 mi away
0.17 MGD
Kendrick · 26 mi away
0.03 MGD
Pierce · 27 mi away
0.17 MGD
Troy · 28 mi away
0.07 MGD
Elk River STP: 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 6, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms