Willow Creek Wastewater Treatment Plant
Willow Creek, MT · Gallatin County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- MT0025038
- Administratively continued
- Permit expires
- November 2023
- Population served
- 211
- CWNS 2022
Willow Creek Wastewater Treatment Plant is a publicly owned wastewater treatment works in Willow Creek, Gallatin County, Montana, serving about 211 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit MT0025038 (administratively continued), which expires in November 2023, with 0 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
- 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 Willow Creek Wastewater Treatment Plant.
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Willow Creek Wastewater Treatment Plant: 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 February 11, 2025.