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South Essex Sewerage District

Sewage treatment plant, major discharger, Salem, Massachusetts. NPDES permit MA0100501 expired Jul 31, 2021; its limits still apply. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (32 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 16 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
March 2026BOD, carbonaceous [5 day, 20 C], weekly average10419 lb/d≤ 9911 lb/d5%
March 2026Solids, total suspended, weekly average17648 lb/d≤ 11150 lb/d58%

Limits in force (43)

ParameterStatisticLimitMonths
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 7433 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendedweekly average≤ 11150 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Nickel, total recoverabledaily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Zinc, total recoverabledaily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Cadmium, total recoverabledaily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Lead, total recoverabledaily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Copper, total recoverabledaily maximumreport only (mg/L)Feb, Apr, Jun, Aug
Flow, in conduit or thru treatment plantrolling average≤ 29.7 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .24 mg/Lall year
Nitrogen, Kjeldahl Totaldaily maximumreport only (mg/L)all year
Nitrite Plus Nitrate Totaldaily maximumreport only (mg/L)all year
Enterococcimonthly geometric mean≤ 35 #/100mLall year
Enterococcidaily maximumreport only (#/100mL)all year
Coliform, fecal generalmonthly geometric mean≤ 88 CFU/100mLall year
Coliform, fecal generaldaily maximumreport only (CFU/100mL)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6194 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 9911 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]monthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)daily minimum≥ 100 %Feb, Apr, Jun, Aug
LC50 Static 48Hr Acute Menidiadaily minimum≥ 100 %Feb, Apr, Jun, Aug
Noael Statre 7Day Chronic Arbaciadaily minimumreport only (% effect)Feb, Apr, Jun, Aug
Noael Statre 7Day Chronic Menidiadaily minimumreport only (% effect)Feb, Apr, Jun, Aug

How strict are these limits?

Cited limits by parameter: Massachusetts's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MA0100501 · MCP: https://passage-data.com/mcp