Passage Data · Check a report · Use it from your AI

Islesboro Town of

Sewage treatment plant, Islesboro, Maine. NPDES permit ME0100269, in force until Aug 31, 2030. Last 12 months: no values over a limit, 2 required values missing, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (25 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (25)

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≤ 16 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 27 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 24 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≤ 16 lb/dall year
Solids, total suspendeddaily maximum≤ 27 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 24 lb/dall year
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 14 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 31 #/100mLall year
Flow, in conduit or thru treatment plantmonthly average≤ .0637 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Enterococcimonthly geometric meanreport only (#/100mL)Apr–Oct
Enterococcidaily maximumreport only (#/100mL)Apr–Oct
Mercury, total [as Hg]monthly average≤ 9.9 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 14.8 ng/Lall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

New limits from Apr 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Enterococci, daily maximum54 #/100mL (Apr–Oct)new1 #/100mL (7 values, 4 below detection)—
Enterococci, monthly geometric mean8 #/100mL (Apr–Oct)new1 #/100mL (7 values, 4 below detection)—

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ME0100269 · MCP: https://passage-data.com/mcp