City Of Polson WWTP
106 1st Street E, Polson, MT 59860 · Lake County · Publicly Owned Treatment Works
- Average flow
- 0.86 MGD
- Design flow
- 0.65 MGD
- NPDES permit
- MT0020559
- Administratively continued
- Permit expires
- August 2024
- Population served
- 5,148
- CWNS 2022
City Of Polson WWTP is a publicly owned wastewater treatment works in Polson, Lake County, Montana treating an average of 0.86 million gallons per day against a permitted design capacity of 0.65 MGD, serving about 5,148 residents. It discharges under NPDES permit MT0020559 (administratively continued), which expires in August 2024, with 0 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in February 2017.
Treatment technology
Treatment structures and unit processes at City Of Polson WWTP.
Treatment structure data not yet analyzed for this facility.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for City Of Polson WWTP in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $40,000
- all cases
- Compliance actions
- $4,500
- required by EPA orders
- EPA inspections
- 1
- latest Sep 2016
Latest case · Feb 2017
City of Polson
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $2,000
EPA's description of the case:
“This Order for Compliance is issued to the City of Polson for failure to submit DMRs for several months in 2007 and failure to monitor for flow, BODs, TSS, E.coli, pH, oil and grease, and nitrate,…”
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Source: EPA ECHO, civil enforcement case 08-2008-0267.
1 informal enforcement action (notices of violation and similar), the latest in Sep 2016.
Full case history with a free Klarifi account
Every action against City Of Polson WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at City Of Polson WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Montana
Ronan · 12 mi away
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Pablo · 13 mi away
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Polson · 14 mi away
0.0086 MGD
Charlo · 18 mi away
0.02 MGD
Hot Springs · 23 mi away
0.43 MGD
Bigfork · 26 mi away
0.007 MGD
Bigfork · 26 mi away
0.37 MGD
St. Ignatius · 26 mi away
0.02 MGD
City Of Polson WWTP: 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 March 23, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms