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Suffolk Co DPW

Sewage treatment plant, major discharger, Stony Brook, New York. NPDES permit NY0206644, in force until Nov 30, 2028. Last 12 months: over a limit once (last May 2026), 1 required value missing, 3 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 002 form M monthly (28 values), outfall 002 form N monthly (15 values), outfall 002 form Q quarterly (7 values), outfall 003 form M monthly (8 values), outfall 002 form T quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 41 reports late

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

Period endingParameterReportedLimitOver by
May 2026Coliform, total general, monthly median3095 #/100mL≤ 700 #/100mL342%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year002
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspended7-day average≤ 45 mg/Lall year002
Solids, total suspendedmonthly average≤ 700 lb/dall year002
Solids, total suspended7-day average≤ 1050 lb/dall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendedmonthly averagereport only (lb/d)all year002
Solids, settleabledaily maximum≤ .3 mL/Lall year002
Nitrogen, total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, total [as N]monthly averagereport only (lb/d)all year002
Nitrogen, total [as N]individual rolling averagereport only (lb/d)all year002
Nitrogen, total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, total [as N]monthly averagereport only (lb/d)all year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Phosphate, ortho, dissolved [as P]daily maximumreport only (mg/L)all year002
Phosphate, ortho, dissolved [as P]daily maximumreport only (mg/L)all year002
Cyanide, total [as CN]daily maximum≤ .0077 mg/L (alert, not enforceable)all year002
Copper, total [as Cu]daily maximum≤ .027 mg/L (alert, not enforceable)all year002
Zinc, total [as Zn]daily maximum≤ .23 mg/L (alert, not enforceable)all year002
Total agg concentration #1monthly averagereport only (lb/d)all year002
Total agg concentration #1rolling average≤ 213 lb/dall year002
Flow, in conduit or thru treatment plantmonthly average≤ 2.8 MGDall year002
Chlorine, total residualdaily maximum≤ .198 mg/Lall year002
Enterococci30-day geometric mean≤ 35 #/100mLall year002
Enterococci30-day geometric meanreport only (#/100mL)all year002
Enterococcidaily maximumreport only (#/100mL)all year002
Enterococcidaily maximumreport only (#/100mL)all year002
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year002
Mercury, total [as Hg]daily maximumreport only (ng/L)all year002
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year002
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year002
Coliform, total generalmonthly median≤ 700 #/100mLall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 580 lb/dall year002
BOD, carbonaceous [5 day, 20 C]7-day average≤ 930 lb/dall year002
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year002
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year002
Solids, suspended percent removalmonthly average minimum≥ 85 %all year002
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year002
48Hr Acute Mysidopsis Bahiamaximum≤ 5.85 tox acute (alert, not enforceable)all year002
TU 48Hr Acute Cyprinodon variegatusmaximum≤ 5.85 tox acute (alert, not enforceable)all year002
TU Static Renewal Chronic Cyprinodeon variegatusmaximum≤ 26.4 tox chronic (alert, not enforceable)all year002
TU Static Renewal 7-Day Chronic Americamysis bahia (formerly Mysidopsis bahia)maximum≤ 26.4 tox chronic (alert, not enforceable)all year002
pHdaily minimum≥ 6.5 SUall year003
pHdaily maximum≤ 8.5 SUall year003
Nitrogen, total [as N]monthly average≤ 10 mg/Lall year003
Cyanide, total [as CN]daily maximum≤ .4 mg/Lall year003
Copper, total [as Cu]daily maximum≤ .4 mg/Lall year003
Zinc, total [as Zn]daily maximum≤ 5 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly average≤ .3 MGDall year003
Mercury, total [as Hg]daily maximum≤ 1.4 ug/Lall year003

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/NY0206644 · MCP: https://passage-data.com/mcp