Salmon Sewage Lagoon
43 Lemhi Hole Rd, Salmon, ID 83467 · Lemhi County · Publicly Owned Treatment Works
- Average flow
- 1.09 MGD
- Design flow
- 0.45 MGD
- NPDES permit
- ID0020001
- Administratively continued
- Permit expires
- May 2026
- Population served
- 3,119
- CWNS 2022
Salmon Sewage Lagoon is a publicly owned wastewater treatment works in Salmon, Lemhi County, Idaho treating an average of 1.09 million gallons per day against a permitted design capacity of 0.45 MGD, serving about 3,119 residents. It discharges under NPDES permit ID0020001 (administratively continued), which expires in May 2026, with 2 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in July 2016.
Treatment technology
2 treatment structures and unit processes identified at Salmon Sewage Lagoon.
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See the full treatment train at Salmon Sewage Lagoon: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
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 Salmon Sewage Lagoon in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $6,813
- all cases
- Compliance actions
- $6,910
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Jul 2016
CITY OF SALMON, WASTEWATER TREATMENT FACILITY
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $6,813 · Compliance actions $6,910
EPA's description of the case:
“On July 13, 2016, Region 10 filed a consent agreement and final order addressing violations of the Clean Water Act by the City of Salmon, Idaho. Respondent, which operates a wastewater treatment…”
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Source: EPA ECHO, civil enforcement case 10-2016-0098.
Full case history with a free Klarifi account
Every action against Salmon Sewage Lagoon with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Salmon Sewage Lagoon.
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Nearby wastewater treatment plants in Idaho
Elk City · 87 mi away
0.16 MGD
Mackay · 90 mi away
0.11 MGD
Ketchum · 108 mi away
1.14 MGD
Mccall · 111 mi away
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Cascade · 115 mi away
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New Meadows · 118 mi away
0.92 MGD
Riggins · 119 mi away
0.06 MGD
Grangeville · 119 mi away
0.42 MGD
Salmon Sewage Lagoon: 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 August 19, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms