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Tri-Municipal Sewer Commission

Sewage treatment plant, major discharger, Wappingers Falls, New York. NPDES permit NY0149209 expired Aug 31, 2019; its limits still apply. Last 12 months: over a limit 2 times (last March 2026), 7 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form V monthly (1 value), form X monthly (20 values), form Q quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 9 of 28 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, settleable, daily maximum.4 mL/L≤ .3 mL/L33%
March 2026Flow, in conduit or thru treatment plant, monthly average2.789 MGD≤ 2.775 MGD1%

Limits in force (23)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 700 lb/dall year
Solids, total suspended7-day average≤ 1000 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ 1 lb/d (alert, not enforceable)all year
Nitrogen, ammonia, total [as NH3]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ 2.775 MGDall year
Chlorine, total residualdaily maximum≤ 2 mg/Lall year
Coliform, fecal general30-day geometric mean≤ 200 MPN/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 MPN/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 580 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 930 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: New York'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/NY0149209 · MCP: https://passage-data.com/mcp