Marion Wastewater Treatment Facility
50 Benson Brook Road, Marion, MA 02738 · Plymouth County · Publicly Owned Treatment Works
- Average flow
- 0.44 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 0.44 million gallons per day against a permitted design capacity of 0.59 MGD, serving about 3,335 residents. It discharges under NPDES permit MA0100030 (administratively continued), which expires in November 2022, with 15 recorded violations in the last three years. EPA has recorded 4 formal enforcement actions naming the plant, the latest in October 2017.
Treatment technology
9 treatment structures and unit processes identified at Marion Wastewater Treatment Facility.
Available with a free Klarifi account
See the full treatment train at Marion Wastewater Treatment Facility: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 15
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Marion Wastewater Treatment Facility in EPA's ICIS system.
- Formal actions
- 4
- 0 since FY2020
- Compliance actions
- $43,000
- required by EPA orders
- EPA inspections
- 1
- latest May 2006
Latest case · Oct 2017
MARION TOWN OF
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $10,000
EPA's description of the case:
“On October 20, 2017, EPA entered into an Administrative Order on Consent (Order) with the Town of Marion, MA, in which the Town agreed to implement measures to meet its copper, nitrogen and…”
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Source: EPA ECHO, civil enforcement case 01-2018-2003.
Full case history with a free Klarifi account
Every action against Marion Wastewater Treatment Facility with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
2 verified contacts for Marion Wastewater Treatment Facility, with validated emails and direct phone numbers.
Unlock 2 verified contacts
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
21.74 MGD
Middleborough · 16 mi away
1.21 MGD
Plymouth · 17 mi away
1.08 MGD
Bridgewater · 20 mi away
0.17 MGD
Taunton · 20 mi away
7.32 MGD
Brockton · 27 mi away
14.52 MGD
Rockland · 29 mi away
2.21 MGD
Cohasset · 37 mi away
0.18 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 October 26, 2026; facility record last updated September 27, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms