Cottonwood STP
Cottonwood, ID · Idaho County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.28 MGD
- NPDES permit
- ID0021849
- Administratively continued
- Permit expires
- August 2026
- Population served
- 822
- CWNS 2022
Cottonwood STP is a publicly owned wastewater treatment works in Cottonwood, Idaho County, Idaho, serving about 822 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ID0021849 (administratively continued), which expires in August 2026, with 22 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
- 22
- Effluent violations
- 19
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Cottonwood STP.
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Nearby wastewater treatment plants in Idaho
Grangeville · 13 mi away
0.39 MGD
Nezperce · 14 mi away
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Craigmont · 14 mi away
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Kooskia · 18 mi away
0.11 MGD
White Bird · 20 mi away
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Winchester · 20 mi away
0.03 MGD
Kamiah · 20 mi away
0.12 MGD
Culdesac · 29 mi away
0.03 MGD
Cottonwood 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 September 11, 2026; facility record last updated September 18, 2025.