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Westchester County Dept Env Fac

Sewage treatment plant, major discharger, Mamaroneck, New York. NPDES permit NY0026701 expired Mar 31, 2013; 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 B monthly (37 values), form Q quarterly (1 value), form V quarterly (12 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 (56)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 5800 lb/dall year
Solids, total suspended7-day average≤ 8700 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Solids, settleabledaily maximumreport only (mL/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]annual averagereport only (lb/d)all year
Nitrogen, total [as N]annual average≤ 829 lb/dall year
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Chromium, total [as Cr]daily maximumreport only (mg/L) (alert, not enforceable)all year
Chromium, total [as Cr]daily maximum≤ 3 lb/d (alert, not enforceable)all year
Chromium, total [as Cr]daily maximum≤ 2 lb/d (alert, not enforceable)all year
Copper, total [as Cu]daily maximumreport only (mg/L) (alert, not enforceable)all year
Copper, total [as Cu]daily maximum≤ 6 lb/d (alert, not enforceable)all year
Copper, total [as Cu]daily maximum≤ 6 lb/d (alert, not enforceable)all year
Thallium, total [as Tl]daily maximumreport only (mg/L) (alert, not enforceable)all year
Thallium, total [as Tl]daily maximum≤ 1.8 lb/d (alert, not enforceable)all year
Nickel, total [as Ni]daily maximumreport only (mg/L) (alert, not enforceable)all year
Nickel, total [as Ni]daily maximum≤ 1.7 lb/d (alert, not enforceable)all year
Nickel, total [as Ni]daily maximum≤ 4.2 lb/d (alert, not enforceable)all year
Zinc, total [as Zn]daily maximumreport only (mg/L) (alert, not enforceable)all year
Zinc, total [as Zn]daily maximum≤ 7 lb/d (alert, not enforceable)all year
Zinc, total [as Zn]daily maximum≤ 15 lb/d (alert, not enforceable)all year
Phenolics, total recoverabledaily maximum≤ 9 lb/d (alert, not enforceable)all year
Nitrogen, ammonia, total [as NH3]monthly averagereport only (mg/L)all year
Nitrogen, ammonia, total [as NH3]monthly averagereport only (mg/L)all year
Phenolsdaily maximumreport only (mg/L) (alert, not enforceable)all year
Phenolsdaily maximum≤ 3.4 lb/d (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmonthly average≤ 23.2 MGDall year
Chlorine, total residualdaily maximum≤ 2 mg/Lall year
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/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≤ 4800 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 7700 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

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/NY0026701 · MCP: https://passage-data.com/mcp