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South Portland City of

Sewage treatment plant, major discharger, South Portland, Maine. NPDES permit ME0100633 expired Sep 30, 2022; its limits still apply. Last 12 months: no values over a limit, 1 required value missing, 2 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (52 values), form B monthly (10 values), form C monthly (7 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (73)

ParameterStatisticLimitMonths
Flow rateminimumreport only (gal/min)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 2327 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 12795 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 12795 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximum≤ 12795 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 3490 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 2327 lb/dall year
Solids, total suspendeddaily maximum≤ 9137 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendeddaily maximum≤ 9137 lb/dall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily maximum≤ 9137 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 3490 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)May–Oct
Nitrogen, total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, total [as N]monthly averagereport only (lb/d)May–Oct
Nitrogen, total [as N]daily maximumreport only (lb/d)May–Oct
Nitrogen, total [as N]annual averagereport only (lb/d)Oct
Nitrogen, ammonia total [as N]daily maximumreport only (ug/L)Jun–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (ug/L)Jan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 706 lb/dJun–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1055 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)May–Oct
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)May–Oct
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)May–Oct
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)May–Oct
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)May–Oct
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)May–Oct
Nitrite + Nitrate total [as N]daily maximumreport only (lb/d)May–Oct
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year
Cyanide, free [amenable to chlorination]daily maximum≤ .43 lb/dall year
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 15 #/100mLMay–Sep
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 50 #/100mLMay–Sep
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 50 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximumreport only (#/100mL)May–Sep
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly totalreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .075 mg/Lall year
Chlorine, total residualdaily maximum≤ .078 mg/Lall year
Chlorine, total residualdaily maximum≤ .078 mg/Lall year
Chlorine, total residualdaily maximumreport only (mg/L)all year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Mercury, total [as Hg]monthly average≤ 4.8 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 7.2 ng/Lall year
Overflowsmonthly totalreport only (occur/mo)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulatadaily minimumreport only (%)all year
NOAEL Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)daily minimumreport only (%)all year
NOAEL Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)daily minimumreport only (%)all year

How strict are these limits?

Cited limits by parameter: Maine'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/ME0100633 · MCP: https://passage-data.com/mcp