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Rumford-Mexico Sewerage District

Sewage treatment plant, major discharger, Mexico, Maine. NPDES permit ME0100552, in force until Oct 31, 2029. Last 12 months: over a limit once (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (42 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 23 reports late

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

Period endingParameterReportedLimitOver by
April 2026E. coli, thermotol, MF, MTEC, daily maximum913.9 #/100mL≤ 236 #/100mL287%

Limits in force (42)

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≤ 663 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 1105 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 995 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≤ 663 lb/dall year
Solids, total suspendeddaily maximum≤ 1105 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 995 lb/dall year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Copper, total [as Cu]monthly averagereport only (ug/L)all year
Copper, total [as Cu]daily maximumreport only (ug/L)all year
Copper, total [as Cu]monthly average≤ 2.3 lb/dall year
Copper, total [as Cu]daily maximum≤ .74 lb/dall year
Lead, total [as Pb]monthly averagereport only (ug/L)all year
Lead, total [as Pb]monthly average≤ .12 lb/dall year
Zinc, total [as Zn]monthly averagereport only (ug/L)all year
Zinc, total [as Zn]daily maximumreport only (ug/L)all year
Zinc, total [as Zn]monthly average≤ 2.8 lb/dall year
Zinc, total [as Zn]daily maximum≤ 11.7 lb/dall year
Aluminum, total [as Al]monthly averagereport only (ug/L)all year
Aluminum, total [as Al]daily maximumreport only (ug/L)all year
Aluminum, total [as Al]monthly average≤ .84 lb/dall year
Aluminum, total [as Al]daily maximum≤ 1.8 lb/dall year
Phosphate, ortho [as P]monthly averagereport only (mg/L)May–Sep
Phosphate, ortho [as P]daily maximumreport only (mg/L)May–Sep
Phosphate, ortho [as P]monthly averagereport only (lb/d)May–Sep
Phosphate, ortho [as P]daily maximumreport only (lb/d)May–Sep
E. coli, thermotol, MF, MTECmonthly geometric mean≤ 100 #/100mLApr–Oct
E. coli, thermotol, MF, MTECdaily maximum≤ 236 #/100mLApr–Oct
Flow, in conduit or thru treatment plantmonthly average≤ 2.65 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Mercury, total [as Hg]monthly average≤ 11.7 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 17.6 ng/Lall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

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/ME0100552 · MCP: https://passage-data.com/mcp