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Westchester Co Dept Env Fac

Sewage treatment plant, major discharger, Ossining, New York. NPDES permit NY0108324 expired Jan 31, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (35 values), form Q quarterly (2 values), form V quarterly (6 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 23 reports late

Limits in force (43)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 1800 lb/dall year
Solids, total suspended7-day average≤ 2600 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximum≤ .25 lb/d (alert, not enforceable)all year
Chromium, total [as Cr]daily maximum≤ 1.3 lb/d (alert, not enforceable)all year
Copper, total [as Cu]daily maximum≤ 4.5 lb/d (alert, not enforceable)all year
Silver, total [as Ag]daily maximum≤ 2.2 lb/d (alert, not enforceable)all year
Antimony, total [as Sb]daily maximum≤ 3.6 lb/d (alert, not enforceable)all year
Chloroformdaily maximum≤ .2 lb/d (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmonthly average≤ 7 MGDall year
Chlorine, total residualdaily maximum≤ .34 mg/LMay–Oct
Phosphorous, in total orthophosphatedaily maximumreport only (mg/L)all year
Phosphorous, in total orthophosphatedaily maximumreport only (mg/L)all year
Mercury, total [as Hg]rolling average≤ 20 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Oct
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Oct
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≤ 1500 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 2300 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NY0108324 · MCP: https://passage-data.com/mcp