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Portland Water District

Sewage treatment plant, major discharger, Portland, Maine. NPDES permit ME0102075 expired Mar 31, 2022; its limits still apply. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (54 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimit
December 2025Coliform, fecal general, daily maximum> 928 #/100mL≤ 200 #/100mL
August 2026Coliform, fecal general, daily maximum> 2197 #/100mL≤ 200 #/100mL

Limits in force (58)

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. Cmonthly average≤ 4954 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. Cmonthly average≤ 4954 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 33366 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 7431 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 7431 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 suspendedmonthly average≤ 4954 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 4954 lb/dall year
Solids, total suspendeddaily maximum≤ 52980 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 7431 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 7431 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, 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
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 residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .27 mg/Lall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Coliform, fecal generalmonthly geometric mean≤ 15 #/100mLall year
Coliform, fecal generaldaily maximum≤ 50 #/100mLall year
Coliform, fecal generaldaily maximum≤ 200 #/100mLall year
Overflowsdaily maximumreport 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 minimum≥ 2.4 %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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ME0102075 · MCP: https://passage-data.com/mcp