Cottonwood STP
Airport Rd, Cottonwood, ID 83522 · Idaho County · Publicly Owned Treatment Works
- Average flow
- 0.22 MGD
- 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 treating an average of 0.22 million gallons per day against a permitted design capacity of 0.28 MGD, serving about 822 residents. It discharges under NPDES permit ID0021849 (administratively continued), which expires in August 2026, with 22 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Cottonwood STP.
Available with a free Klarifi account
See the full treatment train at Cottonwood STP: structures, unit processes and planned upgrades, with exact unit counts.
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
0.42 MGD
Nezperce · 14 mi away
0.008 MGD
Craigmont · 15 mi away
0.3 MGD
Kooskia · 18 mi away
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White Bird · 20 mi away
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Winchester · 20 mi away
0.01 MGD
Kamiah · 20 mi away
0.16 MGD
Culdesac · 29 mi away
0.06 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 October 26, 2026; facility record last updated September 18, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms