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Danforth Town of

Sewage treatment plant, Danforth, Maine. NPDES permit ME0100161 expired Aug 31, 2026; its limits still apply. Last 12 months: over a limit 11 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
10 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, minimum5.53 SU≥ 6 SU—
November 2025pH, minimum5.79 SU≥ 6 SU—
March 2026BOD, 5-day, percent removal, monthly average minimum84.46 %≥ 85 %4%
April 2026BOD, 5-day, percent removal, monthly average minimum80.43 %≥ 85 %30%
April 2026Flow, in conduit or thru treatment plant, monthly average.05254 MGD≤ .049 MGD7%
May 2026Flow, in conduit or thru treatment plant, monthly average.06274 MGD≤ .049 MGD28%
June 2026pH, minimum5.81 SU≥ 6 SU—
July 2026pH, minimum5.89 SU≥ 6 SU—
August 2026Chlorine, total residual, daily maximum1.09 mg/L≤ 1 mg/L9%
August 2026pH, minimum5.64 SU≥ 6 SU—
September 2026pH, minimum5.59 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≤ 12 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 20 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 18 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≤ 12 lb/dall year
Solids, total suspendeddaily maximum≤ 20 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 18 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Phosphorus, total [as P]daily maximumreport only (ug/L)Jun–Sep
E. coli, thermotol, MF, MTECmonthly geometric mean≤ 64 #/100mLMay–Sep
E. coli, thermotol, MF, MTECdaily maximum≤ 427 #/100mLMay–Sep
Flow, in conduit or thru treatment plantmonthly average≤ .049 MGDall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Mercury, total [as Hg]monthly average≤ 14.3 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 21.4 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/ME0100161 · MCP: https://passage-data.com/mcp