St. Ignatius-Southside
St. Ignatius, MT · Lake County · Publicly Owned Treatment Works
- Average flow
- 0.04 MGD
- Design flow
- 0.07 MGD
- NPDES permit
- MT0029017
- Effective
- Permit expires
- March 2031
- Population served
- —
- CWNS 2022
St. Ignatius-Southside is a publicly owned wastewater treatment plant in St. Ignatius, Lake County, Montana treating an average of 0.04 million gallons per day against a permitted design capacity of 0.07 MGD. Treatment on site includes uncovered lagoons. It discharges under NPDES permit MT0029017 (effective), which expires in March 2031, with 95 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
- 95
- Effluent violations
- 30
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for St. Ignatius-Southside, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at St. Ignatius-Southside, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Montana
Pablo · 14 mi away
—
Ronan · 14 mi away
0.2 MGD
Polson · 26 mi away
0.5 MGD
Alberton · 28 mi away
0.02 MGD
Missoula · 30 mi away
7.52 MGD
Hot Springs · 32 mi away
0.1 MGD
Superior · 38 mi away
0.03 MGD
Polson · 39 mi away
0.01 MGD
St. Ignatius-Southside: 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 11, 2025.