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Great Salt Bay Sanitary District

Sewage treatment plant, Damariscotta, Maine. NPDES permit ME0101516 expired Jul 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 (23 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 13 reports late

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 67 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 112 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 100 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 50 mg/Lall year001
Solids, total suspendedmonthly average≤ 67 lb/dall year001
Solids, total suspendeddaily maximum≤ 112 lb/dall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 100 lb/dall year001
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 15 #/100mLall year001
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 50 #/100mLall year001
Flow, in conduit or thru treatment plantmonthly average≤ .268 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ 1 mg/Lall year001
Mercury, total [as Hg]monthly average≤ 20.9 ng/Lall year001
Mercury, total [as Hg]daily maximum≤ 31.3 ng/Lall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)AprCMW
Conductivitydaily maximumreport only (umho/cm)AprCMW
pHmaximumreport only (SU)AprCMW
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)AprCMW
Sodium, total [as Na]daily maximumreport only (mg/L)AprCMW
Chloride [as Cl]daily maximumreport only (mg/L)AprCMW

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/ME0101516 · MCP: https://passage-data.com/mcp