City Of Great Falls WWTP
1600 6th Street NE, Great Falls, MT 59404 · Cascade County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- MT0021920
- Administratively continued
- Permit expires
- August 2024
- Population served
- 143
- CWNS 2022
City Of Great Falls WWTP is a publicly owned wastewater treatment works in Great Falls, Cascade County, Montana, serving about 143 residents. It discharges under NPDES permit MT0021920 (administratively continued), which expires in August 2024, with 0 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in January 2022.
Treatment technology
3 treatment structures and unit processes identified at City Of Great Falls WWTP.
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See the full treatment train at City Of Great Falls WWTP: structures, unit processes and planned upgrades, with exact unit counts.
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 Great Falls WWTP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $645,000
- all cases
- Compliance actions
- $2.8M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Jan 2022
City of Great Falls & Malteurop North America Inc
Judicial case · CWA, Effluent Limitations - NPDES Toxic & Pretreatment Effluent Standards · Final Order With Penalty · Penalty $645,000 · Compliance actions $2.8M
EPA's description of the case:
“The City of Great Falls, Montana has agreed through a consent decree to control wastewater discharges that generate high levels of toxic gas in the City?s sewer system. The City has also agreed to…”
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Source: EPA ECHO, civil enforcement case 08-2008-0232.
Full case history with a free Klarifi account
Every action against City Of Great Falls WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
3 verified contacts for City Of Great Falls WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at City Of Great Falls WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Montana
Great Falls · 2 mi away
0.33 MGD
Great Falls · 9 mi away
0.05 MGD
Vaughn · 12 mi away
0.03 MGD
Stockett · 12 mi away
0.02 MGD
Belt · 20 mi away
0.82 MGD
Highwood · 23 mi away
0.04 MGD
Fairfield · 33 mi away
0.16 MGD
Fort Benton · 37 mi away
0.06 MGD
City Of Great Falls 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 April 5, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms