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Boston Water & Sewer Comm -Cso

Sewerage Systems, major discharger, Boston, Massachusetts. NPDES permit MA0101192 expired May 27, 2008; its limits still apply. Last 12 months: over a limit 2 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (17 values), form T monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimit
October 2025pH, minimum5.6 SU≥ 6.5 SU
September 2026pH, minimum6 SU≥ 6.5 SU

Limits in force (19)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Caveragereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedaveragereport only (mg/L)all year
Solids, total suspendedmaximumreport only (mg/L)all year
E. coli, thermotol, MF, MTECaveragereport only (CFU/100mL)all year
E. coli, thermotol, MF, MTECmaximumreport only (CFU/100mL)all year
Rainfallaverage valuereport only (in)all year
Rainfallmaximum valuereport only (in)all year
Chlorine, total residualaverage≤ .1 mg/Lall year
Chlorine, total residualmaximum hourly average≤ .25 mg/Lall year
Rainfall eventsevent totalreport only (occur/mo)all year
Flow, totalaveragereport only (Mgal)all year
Flow, totalmaximumreport only (Mgal)all year
Coliform, fecal generalaverage≤ 200 CFU/100mLall year
Coliform, fecal generalmaximum≤ 400 CFU/100mLall year
LC50 Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all year
LC50 Static Renewal 48Hr Acute Menidiamonthly average minimumreport only (%)all year

Cited limits by parameter: Massachusetts'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/MA0101192 · MCP: https://passage-data.com/mcp