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Yarmouth Town of

Sewage treatment plant, major discharger, Yarmouth, Maine. NPDES permit ME0100765 expired Aug 31, 2022; its limits still apply. Last 12 months: over a limit once (last July 2026), 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (35 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimit
July 2026pH, minimum5.8 SU≥ 6 SU

Limits in force (35)

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≤ 210 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 350 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 315 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≤ 210 lb/dall year
Solids, total suspendeddaily maximum≤ 350 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 315 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Sep, Oct
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Sep, Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)Sep, Oct
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)Sep, Oct
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Sep, Oct
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Sep, Oct
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)Sep, Oct
Nitrite + Nitrate total [as N]daily maximumreport only (lb/d)Sep, Oct
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ 1.15 lb/dall 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≤ 1.31 MGDall 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≤ .3 mg/Lall year
Mercury, total [as Hg]monthly average≤ 10.1 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 15.1 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.

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/ME0100765 · MCP: https://passage-data.com/mcp