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Saco Wastewater Treatment Facility

Sewage treatment plant, major discharger, Saco, Maine. NPDES permit ME0101117 expired Sep 30, 2021; its limits still apply. Last 12 months: over a limit 3 times (last July 2026), 1 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (39 values), form B monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 5 required values missing, 3 of 24 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average1360 lb/d≤ 1050 lb/d30%
March 2026Solids, total suspended, monthly average1093 lb/d≤ 1050 lb/d4%
July 2026Coliform, fecal MF, MFC broth, 44.5 C, daily maximum59.1 #/100mL≤ 50 #/100mL18%

Limits in force (53)

ParameterStatisticLimitMonths
Flow ratedaily maximumreport only (gal/min)all year
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. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 1050 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximum≤ 1882 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 1050 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 1576 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 1576 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 1050 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendeddaily maximum≤ 5127 lb/dall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 1050 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 1576 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 1576 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 15 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 50 #/100mLall year
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 200 #/100mLall year
Flow, in conduit or thru treatment plantmonthly average≤ 4.2 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly totalreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .091 ug/Lall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Mercury, total [as Hg]monthly average≤ 8.1 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 12.1 ng/Lall year
Overflowsdaily maximumreport only (occur/mo)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulatavaluereport only (%)all year
NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulatavaluereport only (%)all year
NOAEL Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)valuereport only (%)all year
NOAEL Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)valuereport only (%)all year

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/ME0101117 · MCP: https://passage-data.com/mcp