Marion Wastewater Treatment Facility
Marion, MA · Plymouth County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- 0.59 MGD
- NPDES permit
- MA0100030
- Administratively continued
- Permit expires
- November 2022
- Population served
- 3,335
- CWNS 2022
Marion Wastewater Treatment Facility is a publicly owned wastewater treatment works in Marion, Plymouth County, Massachusetts treating an average of 0.09 million gallons per day against a permitted design capacity of 0.59 MGD, serving about 3,335 residents. Treatment on site includes aerated lagoons, biological n removal, biological p removal, biological treatment, other, disinfection, uv and other unit processes. It discharges under NPDES permit MA0100030 (administratively continued), which expires in November 2022, with 17 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Biological N removal
unit processBiological P removal
unit processBiological Treatment, Other
unit processDisinfection, UV
unit processFiltration
unit processFlow Equalization
unit processLagoon, Facultative
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 17
- Effluent violations
- 10
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Marion Wastewater Treatment Facility, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Marion Wastewater Treatment Facility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
New Bedford · 10 mi away
16.7 MGD
Middleborough · 16 mi away
1.09 MGD
Plymouth · 17 mi away
1.31 MGD
Bridgewater · 20 mi away
0.15 MGD
Taunton · 20 mi away
5.36 MGD
Brockton · 27 mi away
9.9 MGD
Rockland · 29 mi away
2 MGD
Cohasset · 37 mi away
0.21 MGD
Marion Wastewater Treatment Facility: 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 November 7, 2025.