Salmon Sewage Lagoon
Salmon, ID · Lemhi County · Publicly Owned Treatment Works
- Average flow
- 1.02 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 1.02 million gallons per day against a permitted design capacity of 0.45 MGD, serving about 3,119 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit ID0020001 (administratively continued), which expires in May 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Salmon Sewage Lagoon.
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Nearby wastewater treatment plants in Idaho
Elk City · 87 mi away
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Mackay · 90 mi away
0.07 MGD
Ketchum · 108 mi away
1.02 MGD
Mccall · 111 mi away
—
Cascade · 115 mi away
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New Meadows · 118 mi away
—
Riggins · 119 mi away
0.07 MGD
Grangeville · 119 mi away
0.39 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 September 11, 2026; facility record last updated August 19, 2026.