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Winterport Water District

Sewage treatment plant, Winterport, Maine. NPDES permit ME0100749 expired Jul 31, 2022; its limits still apply. Last 12 months: over a limit 73 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (24 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
101 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 73 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, daily maximum206 mg/L≤ 50 mg/L312%
October 2025BOD, 5-day, 20 deg. C, daily maximum53 lb/d≤ 46 lb/d15%
October 2025BOD, 5-day, 20 deg. C, monthly average185 mg/L≤ 30 mg/L517%
October 2025BOD, 5-day, 20 deg. C, monthly average44 lb/d≤ 28 lb/d57%
October 2025BOD, 5-day, 20 deg. C, weekly average199 mg/L≤ 45 mg/L342%
October 2025BOD, 5-day, 20 deg. C, weekly average43 lb/d≤ 41 lb/d5%
October 2025BOD, 5-day, percent removal, monthly average minimum11 %≥ 85 %493%
November 2025BOD, 5-day, 20 deg. C, daily maximum132 mg/L≤ 50 mg/L164%
November 2025BOD, 5-day, 20 deg. C, daily maximum51 lb/d≤ 46 lb/d11%
November 2025BOD, 5-day, 20 deg. C, monthly average113 mg/L≤ 30 mg/L277%
November 2025BOD, 5-day, 20 deg. C, monthly average43 lb/d≤ 28 lb/d54%
November 2025BOD, 5-day, 20 deg. C, weekly average206 mg/L≤ 45 mg/L358%
November 2025BOD, 5-day, 20 deg. C, weekly average53 lb/d≤ 41 lb/d29%
December 2025BOD, 5-day, 20 deg. C, daily maximum107 mg/L≤ 50 mg/L114%
December 2025BOD, 5-day, 20 deg. C, monthly average40 lb/d≤ 28 lb/d43%
December 2025BOD, 5-day, 20 deg. C, monthly average92 mg/L≤ 30 mg/L207%
December 2025BOD, 5-day, 20 deg. C, weekly average107 mg/L≤ 45 mg/L138%
December 2025BOD, 5-day, 20 deg. C, weekly average46 lb/d≤ 41 lb/d12%
January 2026BOD, 5-day, 20 deg. C, daily maximum118 mg/L≤ 50 mg/L136%
January 2026BOD, 5-day, 20 deg. C, monthly average42 lb/d≤ 28 lb/d50%
January 2026BOD, 5-day, 20 deg. C, monthly average92 mg/L≤ 30 mg/L207%
January 2026BOD, 5-day, 20 deg. C, weekly average118 mg/L≤ 45 mg/L162%
January 2026BOD, 5-day, 20 deg. C, weekly average46 lb/d≤ 41 lb/d12%
February 2026BOD, 5-day, 20 deg. C, daily maximum223 mg/L≤ 50 mg/L346%
February 2026BOD, 5-day, 20 deg. C, daily maximum73 lb/d≤ 46 lb/d59%
February 2026BOD, 5-day, 20 deg. C, monthly average165 mg/L≤ 30 mg/L450%
February 2026BOD, 5-day, 20 deg. C, monthly average57 lb/d≤ 28 lb/d104%
February 2026BOD, 5-day, 20 deg. C, weekly average223 mg/L≤ 45 mg/L396%
February 2026BOD, 5-day, 20 deg. C, weekly average73 lb/d≤ 41 lb/d78%
March 2026BOD, 5-day, 20 deg. C, daily maximum132 lb/d≤ 46 lb/d187%
March 2026BOD, 5-day, 20 deg. C, daily maximum184 mg/L≤ 50 mg/L268%
March 2026BOD, 5-day, 20 deg. C, monthly average104 mg/L≤ 30 mg/L247%
March 2026BOD, 5-day, 20 deg. C, monthly average89 lb/d≤ 28 lb/d218%
March 2026BOD, 5-day, 20 deg. C, weekly average132 lb/d≤ 41 lb/d222%
March 2026BOD, 5-day, 20 deg. C, weekly average184 mg/L≤ 45 mg/L309%
March 2026Solids, total suspended, weekly average45 lb/d≤ 41 lb/d10%
April 2026BOD, 5-day, 20 deg. C, daily maximum101 lb/d≤ 46 lb/d120%
April 2026BOD, 5-day, 20 deg. C, daily maximum122 mg/L≤ 50 mg/L144%
April 2026BOD, 5-day, 20 deg. C, monthly average73 lb/d≤ 28 lb/d161%
April 2026BOD, 5-day, 20 deg. C, monthly average91 mg/L≤ 30 mg/L203%
April 2026BOD, 5-day, 20 deg. C, weekly average101 lb/d≤ 41 lb/d146%
April 2026BOD, 5-day, 20 deg. C, weekly average94 mg/L≤ 45 mg/L109%
May 2026BOD, 5-day, 20 deg. C, daily maximum102 lb/d≤ 46 lb/d122%
May 2026BOD, 5-day, 20 deg. C, daily maximum129 mg/L≤ 50 mg/L158%
May 2026BOD, 5-day, 20 deg. C, monthly average114 mg/L≤ 30 mg/L280%
May 2026BOD, 5-day, 20 deg. C, monthly average72 lb/d≤ 28 lb/d157%
May 2026BOD, 5-day, 20 deg. C, weekly average102 lb/d≤ 41 lb/d149%
May 2026BOD, 5-day, 20 deg. C, weekly average129 mg/L≤ 45 mg/L187%
June 2026BOD, 5-day, 20 deg. C, daily maximum119 mg/L≤ 50 mg/L138%
June 2026BOD, 5-day, 20 deg. C, monthly average102 mg/L≤ 30 mg/L240%
June 2026BOD, 5-day, 20 deg. C, monthly average35 lb/d≤ 28 lb/d25%
June 2026BOD, 5-day, 20 deg. C, weekly average119 mg/L≤ 45 mg/L164%
July 2026BOD, 5-day, 20 deg. C, daily maximum187 mg/L≤ 50 mg/L274%
July 2026BOD, 5-day, 20 deg. C, daily maximum48 lb/d≤ 46 lb/d4%
July 2026BOD, 5-day, 20 deg. C, monthly average140 mg/L≤ 30 mg/L367%
July 2026BOD, 5-day, 20 deg. C, monthly average36 lb/d≤ 28 lb/d29%
July 2026BOD, 5-day, 20 deg. C, weekly average177 mg/L≤ 45 mg/L293%
July 2026BOD, 5-day, 20 deg. C, weekly average44 lb/d≤ 41 lb/d7%
July 2026Solids, total suspended, monthly average37 mg/L≤ 30 mg/L23%
August 2026BOD, 5-day, 20 deg. C, daily maximum175 mg/L≤ 50 mg/L250%
August 2026BOD, 5-day, 20 deg. C, monthly average155 mg/L≤ 30 mg/L417%
August 2026BOD, 5-day, 20 deg. C, weekly average187 mg/L≤ 45 mg/L316%
August 2026BOD, 5-day, 20 deg. C, weekly average48 lb/d≤ 41 lb/d17%
August 2026Solids, total suspended, daily maximum86 mg/L≤ 50 mg/L72%
August 2026Solids, total suspended, monthly average53 mg/L≤ 30 mg/L77%
August 2026Solids, total suspended, weekly average86 mg/L≤ 45 mg/L91%
September 2026BOD, 5-day, 20 deg. C, daily maximum182 mg/L≤ 50 mg/L264%
September 2026BOD, 5-day, 20 deg. C, daily maximum58 lb/d≤ 46 lb/d26%
September 2026BOD, 5-day, 20 deg. C, monthly average141 mg/L≤ 30 mg/L370%
September 2026BOD, 5-day, 20 deg. C, monthly average40 lb/d≤ 28 lb/d43%
September 2026BOD, 5-day, 20 deg. C, weekly average182 mg/L≤ 45 mg/L304%
September 2026BOD, 5-day, 20 deg. C, weekly average43 lb/d≤ 41 lb/d5%
September 2026Solids, total suspended, monthly average32 mg/L≤ 30 mg/L7%

Limits in force (24)

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≤ 28 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 46 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 41 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≤ 28 lb/dall year
Solids, total suspendeddaily maximum≤ 46 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 41 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall 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
Flow, in conduit or thru treatment plantmonthly average≤ .2 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .86 mg/Lall year
Mercury, total [as Hg]average≤ 44.8 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 67.2 ng/Lall year
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/ME0100749 · MCP: https://passage-data.com/mcp