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Suffolk Co DPW

Sewage treatment plant, major discharger, Port Jefferson, New York. NPDES permit NY0021750, in force until Nov 30, 2028. Last 12 months: over a limit once (last May 2026), 2 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (28 values), form N monthly (15 values), form Q quarterly (5 values), form T quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 29 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 (56)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 290 lb/dall year
Solids, total suspended7-day average≤ 430 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, 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]individual rolling 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, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all 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
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L) (alert, not enforceable)all year
Cyanide, total [as CN]daily maximum≤ .042 mg/Lall year
Copper, total [as Cu]daily maximum≤ .063 mg/L (alert, not enforceable)all year
Total agg concentration #1monthly averagereport only (lb/d)all year
Total agg concentration #1rolling average≤ 213 lb/dall year
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ 1.15 MGDall year
Chlorine, total residualdaily maximum≤ .198 mg/Lall year
Enterococci30-day geometric mean≤ 35 #/100mLall year
Enterococci30-day geometric meanreport only (#/100mL)all year
Enterococcidaily maximumreport only (#/100mL)all year
Enterococcidaily maximumreport only (#/100mL)all year
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year
Coliform, total generalmonthly median≤ 700 #/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≤ 240 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 380 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
48Hr Acute Mysidopsis Bahiamaximum≤ 5.83 tox acute (alert, not enforceable)all year
TU 48Hr Acute Cyprinodon variegatusmaximum≤ 5.83 tox acute (alert, not enforceable)all year
TU Static Renewal Chronic Cyprinodeon variegatusmaximum≤ 26.4 tox chronic (alert, not enforceable)all year
TU Static Renewal 7-Day Chronic Americamysis bahia (formerly Mysidopsis bahia)maximum≤ 26.4 tox chronic (alert, not enforceable)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/NY0021750 · MCP: https://passage-data.com/mcp