Ronan City WWTF
Ronan, MT · Lake County · Publicly Owned Treatment Works
- Average flow
- 0.2 MGD
- Design flow
- 0.37 MGD
- NPDES permit
- MT0021474
- Effective
- Permit expires
- June 2027
- Population served
- 1,696
- CWNS 2022
Ronan City WWTF is a publicly owned wastewater treatment works in Ronan, Lake County, Montana treating an average of 0.2 million gallons per day against a permitted design capacity of 0.37 MGD, serving about 1,696 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit MT0021474 (effective), which expires in June 2027, with 523 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 523
- Effluent violations
- 29
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Ronan City WWTF, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Ronan City WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Montana
Pablo · 3 mi away
—
Polson · 12 mi away
0.5 MGD
St. Ignatius · 14 mi away
0.04 MGD
Polson · 25 mi away
0.01 MGD
Hot Springs · 26 mi away
0.1 MGD
Bigfork · 36 mi away
0.0043 MGD
Bigfork · 38 mi away
0.32 MGD
Plains · 38 mi away
0.1 MGD
Ronan City 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 5, 2025.