Amherst Wastewater Treatment Plant
Hadley, MA · Hampshire County · Publicly Owned Treatment Works
- Average flow
- 3.33 MGD
- Design flow
- 7.1 MGD
- NPDES permit
- MA0100218
- Effective
- Permit expires
- January 2029
- Population served
- 35,110
- CWNS 2022
Amherst Wastewater Treatment Plant is a publicly owned wastewater treatment works in Hadley, Hampshire County, Massachusetts treating an average of 3.33 million gallons per day against a permitted design capacity of 7.1 MGD, serving about 35,110 residents. Treatment on site includes clarifiers, biological n removal, biological treatment, other, biosolids thickening, disinfection, chlorine/ chloramine and other unit processes. It discharges under NPDES permit MA0100218 (effective), which expires in January 2029, with 42 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 N removal
unit processBiological Treatment, Other
unit processBiosolids Thickening
unit processDisinfection, chlorine/ chloramine
unit processPrimary Clarification or Sedimentation
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 42
- Effluent violations
- 38
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
4 verified contacts for Amherst 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 Amherst Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
Hatfield · 3 mi away
0.14 MGD
Hadley · 5 mi away
0.34 MGD
Sunderland · 5 mi away
0.13 MGD
Northampton · 7 mi away
3.84 MGD
Deerfield · 12 mi away
0.07 MGD
Greenfield · 13 mi away
1.44 MGD
Montague · 14 mi away
0.54 MGD
Holyoke · 14 mi away
5.02 MGD
Amherst 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 May 19, 2025.