City Of Thompson Falls WWTF
Thompson Falls, MT · Sanders County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- —
- NPDES permit
- MTG581035
- Administratively continued
- Permit expires
- December 2022
- Population served
- —
- CWNS 2022
City Of Thompson Falls WWTF is a publicly owned wastewater treatment works in Thompson Falls, Sanders County, Montana treating an average of 0.05 million gallons per day. Treatment on site includes uncovered lagoons. It discharges under NPDES permit MTG581035 (administratively continued), which expires in December 2022, with 1 recorded violation 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
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for City Of Thompson Falls WWTF, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at City Of Thompson Falls WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Montana
Plains · 22 mi away
0.1 MGD
Hot Springs · 33 mi away
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Superior · 35 mi away
0.03 MGD
Libby · 56 mi away
0.23 MGD
Polson · 56 mi away
0.5 MGD
Alberton · 58 mi away
0.02 MGD
Ronan · 58 mi away
0.2 MGD
Pablo · 61 mi away
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City Of Thompson Falls WWTF: 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 November 6, 2025.