Manhattan WWTF
218 Lund Lane, Manhattan, MT 59741 · Gallatin County · Publicly Owned Treatment Works
- Average flow
- 0.29 MGD
- Design flow
- 0.37 MGD
- NPDES permit
- MT0021857
- Administratively continued
- Permit expires
- August 2015
- Population served
- 3,366
- CWNS 2022
Manhattan WWTF is a publicly owned wastewater treatment works in Manhattan, Gallatin County, Montana treating an average of 0.29 million gallons per day against a permitted design capacity of 0.37 MGD, serving about 3,366 residents. It discharges under NPDES permit MT0021857 (administratively continued), which expires in August 2015, with 20 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Manhattan WWTF.
Available with a free Klarifi account
See the full treatment train at Manhattan WWTF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 20
- Effluent violations
- 16
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Manhattan WWTF.
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Nearby wastewater treatment plants in Montana
Belgrade · 9 mi away
0.16 MGD
Three Forks · 10 mi away
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Belgrade · 10 mi away
0.36 MGD
Willow Creek · 16 mi away
—
Bozeman · 17 mi away
6.55 MGD
Bozeman · 19 mi away
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Bozeman · 24 mi away
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Townsend · 33 mi away
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Manhattan 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 October 26, 2026; facility record last updated November 13, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms