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Stonington Sanitary District

Sewage treatment plant, Stonington, Maine. NPDES permit ME0101851, in force until Feb 28, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (22 values), outfall 01T form 2 monthly (23 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 245 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 217 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Oct, Nov, Dec001
pHminimum≥ 6 SUMay–Sep001
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Oct, Nov, Dec001
pHmaximum≤ 9 SUMay–Sep001
Solids, total suspendedmonthly average≤ 163 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 144 lb/dall year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Solids, settleabledaily maximumreport only (mL/L)May–Sep001
Solids, settleabledaily maximumreport only (mL/L)Jan, Feb, Mar, Apr, Oct, Nov, Dec001
Fecal coliform, MPN, EC med, 44.5 Cmonthly average≤ 14 #/100mLall year001
Fecal coliform, MPN, EC med, 44.5 Cdaily maximum≤ 31 #/100mLall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantrolling average≤ 106000 gal/dall year001
Chlorine, total residualdaily maximum≤ 1 mg/LMay–Sep001
BOD, percent removal [total]monthly average minimum≥ 30 %all year001
Enterococcimonthly geometric mean≤ 8 MPN/100mLApr–Oct001
Enterococcidaily maximum≤ 54 MPN/100mLApr–Oct001
Mercury, total [as Hg]monthly average≤ 38 ng/Lall year001
Mercury, total [as Hg]daily maximum≤ 57 ng/Lall year001
Solids, suspended percent removalmonthly average minimum≥ 50 %all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 245 mg/Lall year01T
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year01T
BOD, 5-day, 20 deg. Cmonthly average≤ 358 lb/dall year01T
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year01T
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Oct, Nov, Dec01T
pHminimum≥ 6 SUMay–Sep01T
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Oct, Nov, Dec01T
pHmaximum≤ 9 SUMay–Sep01T
Solids, total suspendedmonthly average≤ 163 mg/Lall year01T
Solids, total suspendeddaily maximumreport only (mg/L)all year01T
Solids, total suspendedmonthly average≤ 238 lb/dall year01T
Solids, total suspendeddaily maximumreport only (lb/d)all year01T
Solids, settleablemonthly averagereport only (mL/L)May–Sep01T
Solids, settleablemonthly averagereport only (mL/L)Jan, Feb, Mar, Apr, Oct, Nov, Dec01T
Solids, settleabledaily maximumreport only (mL/L)May–Sep01T
Solids, settleabledaily maximumreport only (mL/L)Jan, Feb, Mar, Apr, Oct, Nov, Dec01T
Fecal coliform, MPN, EC med, 44.5 Cmonthly geometric mean≤ 14 #/100mLall year01T
Fecal coliform, MPN, EC med, 44.5 Cdaily maximum≤ 31 #/100mLall year01T
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01T
Flow, in conduit or thru treatment plantrolling average≤ 175000 gal/dall year01T
Chlorine, total residualdaily maximum≤ 1 mg/LMay–Sep01T
Chlorine, total residualdaily maximum≤ 1 mg/Lall year01T
BOD, percent removal [total]monthly average minimum≥ 30 %all year01T
Enterococcimonthly geometric mean≤ 8 MPN/100mLApr–Oct01T
Enterococcidaily maximum≤ 54 MPN/100mLApr–Oct01T
Mercury, total [as Hg]monthly average≤ 38 ng/Lall year01T
Mercury, total [as Hg]daily maximum≤ 57 ng/Lall year01T
Solids, suspended percent removalmonthly average minimum≥ 50 %all year01T

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/ME0101851 · MCP: https://passage-data.com/mcp