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Mechanic Falls Sanitary District

Sewage treatment plant, major discharger, Mechanic Falls, Maine. NPDES permit ME0100391, in force until Jul 31, 2031. 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 (34 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 14 required values missing, 3 of 12 reports late

Limits in force (34)

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≤ 122 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 204 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 184 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≤ 122 lb/dall year
Solids, total suspendeddaily maximum≤ 204 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 184 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jun–Sep
Phosphorus, total [as P]daily maximumreport only (mg/L)Jun–Sep
Copper, total [as Cu]monthly average≤ .078 lb/dall year
Copper, total [as Cu]daily maximum≤ .041 lb/dall year
Lead, total [as Pb]monthly average≤ .033 lb/dall year
E. coli, thermotol, MF, MTECmonthly geometric mean≤ 100 #/100mLApr–Oct
E. coli, thermotol, MF, MTECdaily maximum≤ 236 #/100mLApr–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 residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .3 mg/Lall year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Mercury, total [as Hg]monthly average≤ 5.6 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 8.5 ng/Lall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year
Noel Statre 10Day Chronic Salvel. Salmoniddaily minimumreport only (%)all year
NOAEL Static 48Hr Acute Salvel. Salmoniddaily minimumreport only (%)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/ME0100391 · MCP: https://passage-data.com/mcp