Hoosic Wastwater Treament Plant
Williamstown, MA · Berkshire County · Publicly Owned Treatment Works
- Average flow
- 2.04 MGD
- Design flow
- 6.5 MGD
- NPDES permit
- MA0100510
- Effective
- Permit expires
- December 2028
- Population served
- 22,403
- CWNS 2022
Hoosic Wastwater Treament Plant is a publicly owned wastewater treatment plant in Williamstown, Berkshire County, Massachusetts treating an average of 2.04 million gallons per day against a permitted design capacity of 6.5 MGD, serving about 22,403 residents. Treatment on site includes clarifiers, biological treatment, other, biosolids aerobic digestion, biosolids drying, biosolids mechanical dewatering and other unit processes. It discharges under NPDES permit MA0100510 (effective), which expires in December 2028, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processBiosolids Drying
unit processBiosolids Mechanical Dewatering
unit processChemical Addition, Alum
unit processChemical Addition, Polymer
unit processChemical P Removal
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processPrimary Clarification or Sedimentation
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Hoosic Wastwater Treament Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Hoosic Wastwater Treament Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
Monroe Bridge · 14 mi away
0.0027 MGD
Pittsfield · 22 mi away
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Shelburne · 26 mi away
0.11 MGD
Lenox · 26 mi away
0.3 MGD
West Stockbridge · 29 mi away
0.009 MGD
Lee · 31 mi away
0.47 MGD
Stockbridge · 31 mi away
0.1 MGD
Deerfield · 33 mi away
0.07 MGD
Hoosic Wastwater Treament 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 May 19, 2025.