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South Essex Wastewater Treatment Plant

50 Fort Ave, Salem, MA 01970 · Essex County · Publicly Owned Treatment Works

Average flow
21.66 MGD
Design flow
—
NPDES permit
MAL100501
Effective
Permit expires
December 2030
Population served
376,847
CWNS 2022

South Essex Wastewater Treatment Plant is a publicly owned wastewater treatment works in Salem, Essex County, Massachusetts treating an average of 21.66 million gallons per day, serving about 376,847 residents. It discharges under NPDES permit MAL100501 (effective), which expires in December 2030, with 33 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in September 1991.

Treatment technology

7 treatment structures and unit processes identified at South Essex Wastewater Treatment Plant.

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See the full treatment train at South Essex Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations
33
Effluent violations
33

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 South Essex Wastewater Treatment Plant in EPA's ICIS system.

Formal actions
2
0 since FY2020
Penalties assessed
$225,000
all cases
EPA inspections
1
latest Jan 2004

Latest case · Sep 1991

SOUTH ESSEX SEWERAGE DISTRICT, ET AL

Judicial case · CWA, Clean Water Act · Final Order With Penalty · Penalty $225,000

Source: EPA ECHO, civil enforcement case 01-1988-0018.

Full case history with a free Klarifi account

Every action against South Essex Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.

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Key contacts

4 verified contacts for South Essex 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 South Essex Wastewater Treatment Plant, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Massachusetts

Manchester Wastewater Treatment Facility

Manchester · 6 mi away

0.44 MGD

0.66 MGD

270.96 MGD

1.53 MGD

1.52 MGD

0.18 MGD

3.3 MGD

0.73 MGD

South Essex 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 December 22, 2024.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms


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