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Machias Town of

Sewage treatment plant, major discharger, Machias, Maine. NPDES permit ME0100323 expired Mar 31, 2021; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (27 values), form B monthly (3 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 24 reports late

Limits in force (33)

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≤ 225 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 338 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≤ 225 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 338 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ .23 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≤ .9 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≤ .08 mg/Lall year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Mercury, total [as Hg]monthly average≤ 19.3 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 29 ng/Lall 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 minimumreport only (%)all year
NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulatadaily minimumreport only (%)all year
Noael Static 48Hr Acute Mysid. Bahiadaily minimum≥ 17 %all year
Noael Static 48Hr Acute Mysid. Bahiadaily minimum≥ 17 %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/ME0100323 · MCP: https://passage-data.com/mcp