Westfield Wastewater Treatment Plant
Westfield, MA · Hampden County · Publicly Owned Treatment Works
- Average flow
- 2.4 MGD
- Design flow
- 6.1 MGD
- NPDES permit
- MA0101800
- Effective
- Permit expires
- November 2028
- Population served
- 2,559
- CWNS 2022
Westfield Wastewater Treatment Plant is a publicly owned wastewater treatment works in Westfield, Hampden County, Massachusetts treating an average of 2.4 million gallons per day against a permitted design capacity of 6.1 MGD, serving about 2,559 residents. Treatment on site includes clarifiers, biological p removal, biosolids chemical addition, biosolids mechanical dewatering, biosolids thickening and other unit processes. It discharges under NPDES permit MA0101800 (effective), which expires in November 2028, with 0 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 P removal
unit processBiosolids Chemical Addition
unit processBiosolids Mechanical Dewatering
unit processBiosolids Thickening
unit processChemical P Removal
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processFlow Equalization
unit processPrimary Clarification or Sedimentation
unit processScreening
unit processSuspended Growth, Aerobic
unit processSuspended Growth, Anaerobic
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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.
Key contacts
30 verified contacts for Westfield 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 Westfield Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
Woronoco Village · 6 mi away
0.004 MGD
Holyoke · 8 mi away
5.02 MGD
Russell · 8 mi away
0.04 MGD
Huntington · 11 mi away
0.03 MGD
Northampton · 15 mi away
3.84 MGD
Hadley · 16 mi away
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Palmer (three Rivers) · 19 mi away
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Hatfield · 20 mi away
0.14 MGD
Westfield 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 September 11, 2026; facility record last updated February 27, 2025.