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Rockland City of

Sewage treatment plant, major discharger, Rockland, Maine. NPDES permit ME0100595 expired Jul 31, 2021; its limits still apply. Last 12 months: over a limit 3 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (29 values), outfall 001 form B monthly (8 values), outfall 001 form C monthly (10 values), outfall 002 form A monthly (9 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 48 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
April 2026Solids, total suspended, daily maximum80 mg/L≤ 71 mg/L13%
May 2026Solids, total suspended, daily maximum82 mg/L≤ 71 mg/L15%
August 2026pH, minimum5.65 SU≥ 6 SU—

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Flow rate, instantaneousdaily maximumreport only (gal/min)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 68 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 1884 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 6463 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
BOD, 5-day, 20 deg. Cweekly average≤ 81 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 2243 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 52 mg/Lall year001
Solids, total suspendeddaily maximum≤ 71 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 1443 lb/dall year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Solids, total suspendeddaily maximum≤ 11276 lb/dall year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Solids, total suspendedweekly average≤ 66 mg/Lall year001
Solids, total suspendedweekly average≤ 1813 lb/dall year001
Solids, settleabledaily maximum≤ .3 mL/Lall year001
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 15 #/100mLMay–Sep001
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 200 #/100mLMay–Sep001
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 50 #/100mLMay–Sep001
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximumreport only (#/100mL)May–Nov001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all year001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all year001
Chlorine, total residualmonthly average≤ .1 mg/Lall year001
Chlorine, total residualdaily maximum≤ .24 mg/Lall year001
Chlorine, total residualdaily maximumreport only (mg/L)all year001
Chlorine, total residualdaily maximum≤ 1 mg/Lall year001
Mercury, total [as Hg]monthly average≤ 6 ng/Lall year001
Mercury, total [as Hg]daily maximum≤ 9 ng/Lall year001
Overflowsmonthly totalreport only (occur/mo)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 1131 lb/dall year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Solids, total suspendeddaily maximum≤ 2376 lb/dall year002
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 200 #/100mLMay–Nov002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all year002
Chlorine, total residualdaily maximum≤ 1 mg/Lall year002
Overflowsmonthly totalreport only (occur/mo)all year002

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/ME0100595 · MCP: https://passage-data.com/mcp