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Middletown TWP Sewerage Auth

Sewage treatment plant, major discharger, Middletown Twp, New Jersey. NPDES permit NJ0025356 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 10 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 26 days after each period: form A monthly (42 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026Enterococci, monthly geometric mean99.8 #/100mL≤ 35 #/100mL185%
February 2026Enterococci, monthly geometric mean104.52 #/100mL≤ 35 #/100mL199%
July 2026BOD, carbonaceous [5 day, 20 C], weekly average1804.32 kg/d≤ 1635 kg/d10%
July 2026BOD, carbonaceous [5 day, 20 C], weekly average66.08 mg/L≤ 40 mg/L65%
July 2026Solids, total suspended, monthly average30.95 mg/L≤ 30 mg/L3%
July 2026Solids, total suspended, weekly average2534.56 kg/d≤ 1839 kg/d38%
July 2026Solids, total suspended, weekly average92.51 mg/L≤ 45 mg/L106%
August 2026BOD, carbonaceous [5 day, 20 C], weekly average45.96 mg/L≤ 40 mg/L15%
August 2026Solids, total suspended, weekly average2236.53 kg/d≤ 1839 kg/d22%
August 2026Solids, total suspended, weekly average78.7 mg/L≤ 45 mg/L75%

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. centigradeinstantaneous minimumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year
Temperature, water deg. centigradeinstantaneous minimumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily average minimumreport only (mg/L)all year
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous minimumreport only (SU)all year
pHinstantaneous maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 1226 kg/dall year
Solids, total suspendedweekly average≤ 1839 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendedmonthly average minimum≥ 85 %all year
Oil & Greasemonthly average≤ 10 mg/Lall year
Oil & Greaseinstantaneous maximum≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)all year
Nitrogen, ammonia total [as N]daily maximumreport only (kg/d)all year
Chlorine produced oxidantsmonthly averagereport only (mg/L)all year
Chlorine produced oxidantsdaily maximumreport only (mg/L)all year
Chlorine produced oxidantsmonthly averagereport only (kg/d)all year
Chlorine produced oxidantsdaily maximumreport only (kg/d)all year
Flow, in conduit or thru treatment plantindividual rolling averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Enterococcimonthly geometric mean≤ 35 #/100mLall year
Enterococciinstantaneous maximumreport only (#/100mL)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1022 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1635 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly average minimum≥ 85 %all year
LC50 Static Renewal 96Hr Acute Americamysis bahia (formerly Mysidopsis bahia)minimumreport only (%)all year

Cited limits by parameter: New Jersey'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/NJ0025356 · MCP: https://passage-data.com/mcp