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Portland Water District

Sewage treatment plant, Portland, Maine. NPDES permit ME0102237 expired Oct 31, 2022; its limits still apply. Last 12 months: over a limit 22 times (last September 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (36 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 22 values over a limit
Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, percent removal, monthly average minimum84 %≥ 85 %7%
May 2026Coliform, fecal general, daily maximum> 2420 #/100mL≤ 50 #/100mL—
May 2026Coliform, fecal general, monthly geometric mean85 #/100mL≤ 15 #/100mL467%
June 2026BOD, 5-day, 20 deg. C, daily maximum196 mg/L≤ 50 mg/L292%
June 2026BOD, 5-day, 20 deg. C, daily maximum252 lb/d≤ 83 lb/d204%
June 2026BOD, 5-day, 20 deg. C, monthly average101 mg/L≤ 30 mg/L237%
June 2026BOD, 5-day, 20 deg. C, monthly average132 lb/d≤ 50 lb/d164%
June 2026BOD, 5-day, 20 deg. C, weekly average196 mg/L≤ 45 mg/L336%
June 2026BOD, 5-day, 20 deg. C, weekly average252 lb/d≤ 75 lb/d236%
June 2026BOD, 5-day, percent removal, monthly average minimum32 %≥ 85 %353%
June 2026Solids, suspended percent removal, monthly average minimum-9 %≥ 85 %627%
June 2026Solids, total suspended, daily maximum365 mg/L≤ 50 mg/L630%
June 2026Solids, total suspended, daily maximum469 lb/d≤ 83 lb/d465%
June 2026Solids, total suspended, monthly average186 mg/L≤ 30 mg/L520%
June 2026Solids, total suspended, monthly average240 lb/d≤ 50 lb/d380%
June 2026Solids, total suspended, weekly average365 mg/L≤ 45 mg/L711%
June 2026Solids, total suspended, weekly average469 lb/d≤ 75 lb/d525%
July 2026BOD, 5-day, 20 deg. C, daily maximum102 mg/L≤ 50 mg/L104%
July 2026Solids, total suspended, daily maximum176 lb/d≤ 83 lb/d112%
July 2026Solids, total suspended, daily maximum216 mg/L≤ 50 mg/L332%
July 2026Solids, total suspended, weekly average80 mg/L≤ 45 mg/L78%
September 2026Coliform, fecal general, daily maximum1100 #/100mL≤ 50 #/100mL2100%

Limits in force (52)

ParameterStatisticLimitMonths
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≤ 50 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 83 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 75 lb/dall year
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Oct, Nov, Dec
pHminimum≥ 6 SUMay–Sep
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Oct, Nov, Dec
pHmaximum≤ 9 SUMay–Sep
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Solids, total suspendedmonthly average≤ 50 lb/dall year
Solids, total suspendeddaily maximum≤ 83 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 75 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/LMay–Sep
Solids, settleabledaily maximum≤ .3 mL/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, total [as N]monthly averagereport only (mg/L)May, Oct
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]daily maximumreport only (mg/L)May–Oct
Nitrogen, total [as N]monthly averagereport only (lb/d)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]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]monthly averagereport only (mg/L)May–Oct
Nitrogen, Kjeldahl, total [as N]daily maximumreport 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]monthly averagereport only (lb/d)May–Oct
Nitrogen, Kjeldahl, total [as N]daily maximumreport 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]monthly averagereport only (mg/L)May–Oct
Nitrite + Nitrate total [as N]daily maximumreport 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]monthly averagereport only (lb/d)May–Oct
Nitrite + Nitrate total [as N]daily maximumreport 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 residualdaily maximum≤ 1 mg/Lall year
Mercury, total [as Hg]monthly average≤ 8.9 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 13.4 ng/Lall year
Coliform, fecal generalmonthly geometric mean≤ 15 #/100mLMay–Sep
Coliform, fecal generaldaily maximum≤ 50 #/100mLMay–Sep
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %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/ME0102237 · MCP: https://passage-data.com/mcp