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Yarmouth Town of

Sewage treatment plant, Yarmouth, Maine. NPDES permit ME0102377 expired Jul 31, 2022; its limits still apply. Last 12 months: over a limit 9 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
9 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025pH, minimum5.9 SU≥ 6 SU—
December 2025pH, minimum5.8 SU≥ 6 SU—
April 2026pH, minimum5.8 SU≥ 6 SU—
May 2026pH, minimum5.7 SU≥ 6 SU—
June 2026pH, minimum5.6 SU≥ 6 SU—
July 2026Chlorine, total residual, daily maximum1.06 mg/L≤ 1 mg/L6%
July 2026pH, minimum5.7 SU≥ 6 SU—
August 2026pH, minimum5.5 SU≥ 6 SU—
September 2026pH, minimum5.7 SU≥ 6 SU—

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≤ 3 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 5 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 4.5 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≤ 3 lb/dall year
Solids, total suspendeddaily maximum≤ 5 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 4.5 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 15 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 50 #/100mLall year
Flow, in conduit or thru treatment plantmonthly average≤ .028 MGDall 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≤ 8.1 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 12.2 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/ME0102377 · MCP: https://passage-data.com/mcp