Hadley Wastewater Treatment Plant
266 Middle Street, Hadley, MA 01035 · Hampshire County · Publicly Owned Treatment Works
- Average flow
- 0.32 MGD
- Design flow
- —
- NPDES permit
- MAG580013
- Effective
- Permit expires
- November 2026
- Population served
- 2,952
- CWNS 2022
Hadley Wastewater Treatment Plant is a publicly owned wastewater treatment works in Hadley, Hampshire County, Massachusetts treating an average of 0.32 million gallons per day, serving about 2,952 residents. It discharges under NPDES permit MAG580013 (effective), which expires in November 2026, with 10 recorded violations in the last three years.
Treatment technology
4 treatment structures and unit processes identified at Hadley Wastewater Treatment Plant.
Available with a free Klarifi account
See the full treatment train at Hadley Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 10
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Hadley Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Hadley Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
Northampton · 2 mi away
4.21 MGD
Hatfield · 5 mi away
0.15 MGD
Hadley · 5 mi away
3.36 MGD
Sunderland · 9 mi away
0.16 MGD
Holyoke · 10 mi away
6.07 MGD
Palmer (three Rivers) · 15 mi away
1.37 MGD
Deerfield · 15 mi away
0.08 MGD
Huntington · 16 mi away
0.03 MGD
Hadley 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 June 30, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms