City Of Billings Wastewater Treatment Plant
Billings, MT · Yellowstone County · Publicly Owned Treatment Works
- Average flow
- 20.31 MGD
- Design flow
- —
- NPDES permit
- MTR000459
- Effective
- Permit expires
- January 2028
- Population served
- 117,116
- CWNS 2022
City Of Billings Wastewater Treatment Plant is a publicly owned wastewater treatment works in Billings, Yellowstone County, Montana treating an average of 20.31 million gallons per day, serving about 117,116 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos. It discharges under NPDES permit MTR000459 (effective), which expires in January 2028, with 7 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
- 7
- Effluent violations
- 0
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 Billings Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at City Of Billings Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Montana
Laurel · 17 mi away
0.29 MGD
Park City · 24 mi away
0.1 MGD
Joliet · 32 mi away
0.06 MGD
Columbus · 39 mi away
0.14 MGD
Lavina · 40 mi away
—
Bridger · 41 mi away
—
Crow Agency · 51 mi away
—
Red Lodge · 55 mi away
0.57 MGD
City Of Billings 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 April 24, 2025.