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Worcester Cso, City DPW

Sewerage Systems, Worcester, Massachusetts. NPDES permit MA0102997 expired Jul 31, 2010; its limits still apply. Last 12 months: over a limit 8 times (last August 2026), 10 required values missing, 10 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (16 values), form B quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 17 required values missing, 12 of 16 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily maximum2200 ug/L≤ 72 ug/L2956%
December 2025Chlorine, total residual, daily maximum350 ug/L≤ 72 ug/L386%
March 2026Chlorine, total residual, daily maximum205.71 ug/L≤ 72 ug/L186%
June 2026Chlorine, total residual, daily maximum910 ug/L≤ 72 ug/L1164%
July 2026Chlorine, total residual, daily maximum638.33 ug/L≤ 72 ug/L787%
July 2026pH, minimum6.12 SU≥ 6.5 SU—
August 2026Chlorine, total residual, daily maximum2200 ug/L≤ 72 ug/L2956%
August 2026pH, minimum6.09 SU≥ 6.5 SU—

Limits in force (25)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.3 SUall year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Apr–Sep
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Apr–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Apr–Sep
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Apr–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Apr–Sep
Phosphorus, total [as P]daily maximumreport only (mg/L)Apr–Sep
Phosphate, ortho [as P]monthly averagereport only (mg/L)Apr–Sep
Phosphate, ortho [as P]daily maximumreport only (mg/L)Apr–Sep
Rainfalldaily maximumreport only (in)all year
Flow, in conduit or thru treatment plantdaily maximum≤ 350 MGDall year
Chlorine, total residualmonthly averagereport only (ug/L)all year
Chlorine, total residualdaily maximum≤ 72 ug/Lall year
Coliform, fecal generalmonthly average≤ 200 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
LC50 Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)all year

How strict are these limits?

Cited limits by parameter: Massachusetts'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/MA0102997 · MCP: https://passage-data.com/mcp