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Lynn Regional W P C F

Sewage treatment plant, major discharger, Lynn, Massachusetts. NPDES permit MA0100552 expired May 31, 2012; its limits still apply. Last 12 months: over a limit 96 times (last September 2026), 7 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form S monthly (34 values), outfall 001 form T monthly (2 values), outfall 002 form S monthly (22 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
58 values over a limit, 2 required values missing, 4 of 28 reports late

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

All 96 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average57.1 mg/L≤ 30 mg/L90%
October 2025BOD, 5-day, 20 deg. C, monthly average8438 lb/d≤ 6459 lb/d31%
October 2025BOD, 5-day, 20 deg. C, weekly average51.7 mg/L≤ 45 mg/L15%
October 2025BOD, 5-day, percent removal, daily minimum80.7 %≥ 85 %29%
October 2025Oil & Grease, daily maximum16 mg/L≤ 15 mg/L7%
October 2025Solids, suspended percent removal, daily minimum80.3 %≥ 85 %31%
October 2025Solids, total suspended, monthly average64.2 mg/L≤ 30 mg/L114%
October 2025Solids, total suspended, monthly average9696 lb/d≤ 6459 lb/d50%
October 2025Solids, total suspended, weekly average60.7 mg/L≤ 45 mg/L35%
November 2025BOD, 5-day, 20 deg. C, monthly average57.8 mg/L≤ 30 mg/L93%
November 2025BOD, 5-day, 20 deg. C, monthly average8380 lb/d≤ 6459 lb/d30%
November 2025BOD, 5-day, 20 deg. C, weekly average61.9 mg/L≤ 45 mg/L38%
November 2025BOD, 5-day, percent removal, daily minimum80.5 %≥ 85 %30%
November 2025Solids, suspended percent removal, daily minimum78.5 %≥ 85 %43%
November 2025Solids, total suspended, monthly average58.8 mg/L≤ 30 mg/L96%
November 2025Solids, total suspended, monthly average8580 lb/d≤ 6459 lb/d33%
November 2025Solids, total suspended, weekly average60.5 mg/L≤ 45 mg/L34%
December 2025BOD, 5-day, 20 deg. C, monthly average42 mg/L≤ 30 mg/L40%
December 2025BOD, 5-day, percent removal, daily minimum84.4 %≥ 85 %4%
December 2025LC50 Static 48Hr Acute Menidia, daily minimum80.8 %≥ 100 %19%
December 2025Oil & Grease, daily maximum17 mg/L≤ 15 mg/L13%
December 2025Solids, suspended percent removal, daily minimum82 %≥ 85 %20%
December 2025Solids, total suspended, monthly average37.7 mg/L≤ 30 mg/L26%
January 2026BOD, 5-day, 20 deg. C, monthly average33 mg/L≤ 30 mg/L10%
January 2026Solids, suspended percent removal, daily minimum81.6 %≥ 85 %23%
January 2026Solids, total suspended, monthly average41.3 mg/L≤ 30 mg/L38%
February 2026BOD, 5-day, 20 deg. C, monthly average49.2 mg/L≤ 30 mg/L64%
February 2026BOD, 5-day, 20 deg. C, monthly average7364 lb/d≤ 6459 lb/d14%
February 2026BOD, 5-day, 20 deg. C, weekly average49.2 mg/L≤ 45 mg/L9%
February 2026BOD, 5-day, percent removal, daily minimum83 %≥ 85 %13%
February 2026Solids, suspended percent removal, daily minimum80.5 %≥ 85 %30%
February 2026Solids, total suspended, monthly average44.4 mg/L≤ 30 mg/L48%
February 2026Solids, total suspended, monthly average6593 lb/d≤ 6459 lb/d2%
March 2026BOD, 5-day, 20 deg. C, monthly average13748 lb/d≤ 6459 lb/d113%
March 2026BOD, 5-day, 20 deg. C, monthly average52.2 mg/L≤ 30 mg/L74%
March 2026BOD, 5-day, 20 deg. C, weekly average13948 lb/d≤ 9688 lb/d44%
March 2026BOD, 5-day, 20 deg. C, weekly average51.2 mg/L≤ 45 mg/L14%
March 2026BOD, 5-day, percent removal, daily minimum64.6 %≥ 85 %136%
March 2026Solids, suspended percent removal, daily minimum60.7 %≥ 85 %162%
March 2026Solids, total suspended, monthly average13394 lb/d≤ 6459 lb/d107%
March 2026Solids, total suspended, monthly average51.2 mg/L≤ 30 mg/L71%
March 2026Solids, total suspended, weekly average13446 lb/d≤ 9688 lb/d39%
March 2026Solids, total suspended, weekly average49.6 mg/L≤ 45 mg/L10%
April 2026BOD, 5-day, 20 deg. C, monthly average11637 lb/d≤ 6459 lb/d80%
April 2026BOD, 5-day, 20 deg. C, monthly average63.9 mg/L≤ 30 mg/L113%
April 2026BOD, 5-day, 20 deg. C, weekly average12264 lb/d≤ 9688 lb/d27%
April 2026BOD, 5-day, 20 deg. C, weekly average66.3 mg/L≤ 45 mg/L47%
April 2026BOD, 5-day, percent removal, daily minimum69.2 %≥ 85 %105%
April 2026Solids, suspended percent removal, daily minimum79.4 %≥ 85 %37%
April 2026Solids, total suspended, monthly average41 mg/L≤ 30 mg/L37%
April 2026Solids, total suspended, monthly average7507 lb/d≤ 6459 lb/d16%
May 2026BOD, 5-day, 20 deg. C, monthly average11154 lb/d≤ 6459 lb/d73%
May 2026BOD, 5-day, 20 deg. C, monthly average76.2 mg/L≤ 30 mg/L154%
May 2026BOD, 5-day, 20 deg. C, weekly average10713 lb/d≤ 9688 lb/d11%
May 2026BOD, 5-day, 20 deg. C, weekly average72 mg/L≤ 45 mg/L60%
May 2026BOD, 5-day, percent removal, daily minimum67.4 %≥ 85 %117%
May 2026Coliform, fecal general, daily maximum290 CFU/100mL≤ 260 CFU/100mL12%
May 2026Solids, suspended percent removal, daily minimum79.3 %≥ 85 %38%
May 2026Solids, total suspended, monthly average49.3 mg/L≤ 30 mg/L64%
May 2026Solids, total suspended, monthly average7204 lb/d≤ 6459 lb/d12%
May 2026Solids, total suspended, weekly average46.9 mg/L≤ 45 mg/L4%
June 2026BOD, 5-day, 20 deg. C, monthly average10482 lb/d≤ 6459 lb/d62%
June 2026BOD, 5-day, 20 deg. C, monthly average79.4 mg/L≤ 30 mg/L165%
June 2026BOD, 5-day, 20 deg. C, weekly average10411 lb/d≤ 9688 lb/d7%
June 2026BOD, 5-day, 20 deg. C, weekly average78.9 mg/L≤ 45 mg/L75%
June 2026BOD, 5-day, percent removal, daily minimum69.8 %≥ 85 %101%
June 2026Coliform, fecal general, daily maximum461 CFU/100mL≤ 260 CFU/100mL77%
June 2026Solids, suspended percent removal, daily minimum76.2 %≥ 85 %59%
June 2026Solids, total suspended, monthly average53.6 mg/L≤ 30 mg/L79%
June 2026Solids, total suspended, monthly average7066 lb/d≤ 6459 lb/d9%
June 2026Solids, total suspended, weekly average52.5 mg/L≤ 45 mg/L17%
July 2026BOD, 5-day, 20 deg. C, monthly average14383 lb/d≤ 6459 lb/d123%
July 2026BOD, 5-day, 20 deg. C, monthly average92.2 mg/L≤ 30 mg/L207%
July 2026BOD, 5-day, 20 deg. C, weekly average13671 lb/d≤ 9688 lb/d41%
July 2026BOD, 5-day, 20 deg. C, weekly average90.1 mg/L≤ 45 mg/L100%
July 2026BOD, 5-day, percent removal, daily minimum64.9 %≥ 85 %134%
July 2026Solids, suspended percent removal, daily minimum70.7 %≥ 85 %95%
July 2026Solids, total suspended, monthly average11668 lb/d≤ 6459 lb/d81%
July 2026Solids, total suspended, monthly average73.8 mg/L≤ 30 mg/L146%
July 2026Solids, total suspended, weekly average10923 lb/d≤ 9688 lb/d13%
July 2026Solids, total suspended, weekly average72.1 mg/L≤ 45 mg/L60%
August 2026BOD, 5-day, 20 deg. C, monthly average61.8 mg/L≤ 30 mg/L106%
August 2026BOD, 5-day, 20 deg. C, monthly average8562 lb/d≤ 6459 lb/d33%
August 2026BOD, 5-day, 20 deg. C, weekly average10128 lb/d≤ 9688 lb/d5%
August 2026BOD, 5-day, 20 deg. C, weekly average69.5 mg/L≤ 45 mg/L54%
August 2026BOD, 5-day, percent removal, daily minimum75.5 %≥ 85 %63%
August 2026Solids, suspended percent removal, daily minimum81.6 %≥ 85 %23%
August 2026Solids, total suspended, monthly average45.2 mg/L≤ 30 mg/L51%
August 2026Solids, total suspended, weekly average51.3 mg/L≤ 45 mg/L14%
September 2026BOD, 5-day, 20 deg. C, monthly average44.4 mg/L≤ 30 mg/L48%
September 2026BOD, 5-day, 20 deg. C, monthly average7508 lb/d≤ 6459 lb/d16%
September 2026BOD, 5-day, percent removal, daily minimum83.3 %≥ 85 %11%
September 2026Coliform, fecal general, daily maximum2420 CFU/100mL≤ 260 CFU/100mL831%
September 2026Solids, suspended percent removal, daily minimum84.5 %≥ 85 %3%
September 2026Solids, total suspended, monthly average41.3 mg/L≤ 30 mg/L38%
September 2026Solids, total suspended, monthly average6916 lb/d≤ 6459 lb/d7%

Limits in force (62)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 46 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 46 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 6459 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 9688 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year001
pHminimum≥ 6.2 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 46 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 53 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 6459 lb/dall year001
Solids, total suspendedweekly average≤ 9688 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmonthly averagereport only (lb/d)all year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]monthly averagereport only (mg/L)all year001
Copper, total [as Cu]daily maximum≤ .11 mg/Lall year001
Flow, in conduit or thru treatment plant12-month average≤ 25.8 MGDall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ 143 ug/Lall year001
Chlorine, total residualdaily maximum≤ 247 ug/Lall year001
Enterococcimonthly geometric meanreport only (CFU/100mL)all year001
Enterococcidaily maximumreport only (CFU/100mL)all year001
Coliform, fecal generalmonthly geometric mean≤ 88 CFU/100mLall year001
Coliform, fecal generaldaily maximum≤ 260 CFU/100mLall year001
BOD, 5-day, percent removaldaily minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 85 %all year001
LC50 Static 48Hr Acute Menidiadaily minimum≥ 100 %Mar, Jun, Sep, Dec001
NOEL Static 7Day Chronic Menidiadaily minimum≥ 5.26 %Mar, Jun, Sep, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
pHminimum≥ 6.2 SUall year002
pHmaximum≤ 8.5 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Oil & Greasemonthly averagereport only (mg/L)all year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Copper, total [as Cu]monthly averagereport only (ug/L)all year002
Copper, total [as Cu]daily maximum≤ 5.8 ug/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ 7.5 ug/Lall year002
Chlorine, total residualdaily maximum≤ 13 ug/Lall year002
Enterococcimonthly geometric meanreport only (CFU/100mL)all year002
Enterococcidaily maximumreport only (CFU/100mL)all year002
Coliform, fecal generalmonthly geometric mean≤ 88 CFU/100mLall year002
Coliform, fecal generaldaily maximum≤ 260 CFU/100mLall year002
BOD, 5-day, percent removaldaily minimumreport only (%)all year002
Solids, suspended percent removaldaily minimumreport only (%)all year002

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/MA0100552 · MCP: https://passage-data.com/mcp