Miles City WWTP
2100 Daly, Miles City, MT 59301 · Custer County · Publicly Owned Treatment Works
- Average flow
- 1.11 MGD
- Design flow
- 1.98 MGD
- NPDES permit
- MT0020001
- Administratively continued
- Permit expires
- September 2023
- Population served
- 9,074
- CWNS 2022
Miles City WWTP is a publicly owned wastewater treatment works in Miles City, Custer County, Montana treating an average of 1.11 million gallons per day against a permitted design capacity of 1.98 MGD, serving about 9,074 residents. It discharges under NPDES permit MT0020001 (administratively continued), which expires in September 2023, with 3 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Miles City WWTP.
Available with a free Klarifi account
See the full treatment train at Miles City WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 3
- 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 Miles City WWTP in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 1
- latest Oct 2002
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against Miles City WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Miles City WWTP.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Montana
Terry · 36 mi away
0.26 MGD
Forsyth · 41 mi away
0.23 MGD
Lame Deer · 68 mi away
0.48 MGD
Broadus · 71 mi away
0.11 MGD
Ekalaka · 71 mi away
0.05 MGD
Glendive · 73 mi away
0.85 MGD
Baker · 73 mi away
—
Jordan · 79 mi away
0.02 MGD
Miles City 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 May 20, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms