City Of Billings Wastewater Treatment Plant
725 Highway 87 East, Billings, MT 59101 · Yellowstone County · Publicly Owned Treatment Works
- Average flow
- 20.32 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 20.32 million gallons per day, serving about 117,116 residents. It discharges under NPDES permit MTR000459 (effective), which expires in January 2028, with 7 recorded violations in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in November 2018.
Treatment technology
3 treatment structures and unit processes identified at City Of Billings Wastewater Treatment Plant.
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See the full treatment train at City Of Billings Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for City Of Billings Wastewater Treatment Plant in EPA's ICIS system.
- Formal actions
- 3
- 0 since FY2020
- Penalties assessed
- $900
- all cases
- Compliance actions
- $33,783
- required by EPA orders
- EPA inspections
- 2
- latest Apr 2009
Latest case · Nov 2018
City of Billings
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty
EPA's description of the case:
“The Pretreatment Regulations apply to publicly owned treatment works (POTWs) and to industrial users discharging pollutants to POTWs from non-domestic sources. The Pretreatment Regulations prohibit…”
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Source: EPA ECHO, civil enforcement case 08-2017-0097.
Full case history with a free Klarifi account
Every action against City Of Billings Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
2 verified contacts for City Of Billings Wastewater Treatment Plant, with validated emails and direct phone numbers.
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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
0.08 MGD
Joliet · 32 mi away
0.05 MGD
Fromberg · 35 mi away
0.04 MGD
Columbus · 39 mi away
0.15 MGD
Lavina · 40 mi away
18.51 MGD
Bridger · 41 mi away
0.04 MGD
Crow Agency · 51 mi away
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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 October 26, 2026; facility record last updated September 14, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms