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Mendham Boro

Sewage treatment plant, Mendham Boro, New Jersey. NPDES permit NJ0021334 expired Mar 31, 2026; its limits still apply. Last 12 months: over a limit 8 times (last July 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 26 days after each period: form A monthly (52 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total dissolved, monthly average522 mg/L≤ 509 mg/L3%
January 2026Solids, total dissolved, monthly average678 mg/L≤ 509 mg/L33%
February 2026Solids, total dissolved, monthly average703 mg/L≤ 509 mg/L38%
March 2026Solids, total dissolved, monthly average723 mg/L≤ 509 mg/L42%
April 2026Solids, total dissolved, monthly average546 mg/L≤ 509 mg/L7%
May 2026Solids, total dissolved, monthly average515 mg/L≤ 509 mg/L1%
June 2026Solids, total dissolved, monthly average530 mg/L≤ 509 mg/L4%
July 2026Solids, total dissolved, monthly average531 mg/L≤ 509 mg/L4%

Limits in force (56)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademinimumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)all year
Temperature, water deg. centigrademinimumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)all year
Oxygen, dissolved [DO]monthly average minimum≥ 7 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 46 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 69 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average minimum≥ 85 %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≤ 46 kg/dall year
Solids, total suspendedweekly average≤ 69 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 & Greasedaily maximum≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 11.6 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.6 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 19 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 17.6 kg/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.5 kg/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 28.76 kg/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 22.71 kg/dMay–Oct
Nitrogen, nitrate total [as N]monthly average≤ 15 mg/Lall year
Nitrogen, nitrate total [as N]weekly averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]monthly average≤ 25.6 kg/dall year
Nitrogen, nitrate total [as N]weekly averagereport only (kg/d)all year
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (kg/d)all year
Phosphorus, total [as P]weekly averagereport only (kg/d)all year
Copper, total recoverablemonthly averagereport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverablemonthly averagereport only (g/d)all year
Copper, total recoverabledaily maximumreport only (g/d)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
E. colimonthly geometric mean≤ 126 #/100mLall year
E. coliinstantaneous maximumreport only (#/100mL)all year
Solids, total dissolvedmonthly average≤ 509 mg/Lall year
Solids, total dissolvedweekly averagereport only (mg/L)all year
Solids, total dissolvedmonthly average≤ 870 kg/dall year
Solids, total dissolvedweekly averagereport only (kg/d)all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 46 %all year

How strict are these limits?

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/NJ0021334 · MCP: https://passage-data.com/mcp