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Middleport (V)

Sewage treatment plant, Middleport, New York. NPDES permit NY0022331 expired Jan 31, 2020; its limits still apply. Last 12 months: over a limit 2 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (23 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 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
March 2026Flow, in conduit or thru treatment plant, monthly average.835 MGD≤ .7 MGD19%
April 2026Flow, in conduit or thru treatment plant, monthly average.787 MGD≤ .7 MGD12%

Limits in force (32)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Oxygen, dissolved [DO]daily minimum≥ 2 mg/Lall year
pHminimum≥ 6.5 SUJan, Feb, Mar, Apr, May, Nov, Dec
pHminimum≥ 6 SUJun–Oct
pHmaximum≤ 8.5 SUJan, Feb, Mar, Apr, May, Nov, Dec
pHmaximum≤ 9 SUJun–Oct
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 175 lb/dall year
Solids, total suspendedmonthly average≤ 180 lb/dall year
Solids, total suspended7-day average≤ 263 lb/dall year
Solids, total suspended7-day average≤ 260 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Nitrogen, ammonia, total [as NH3]monthly averagereport only (mg/L)all year
Nitrogen, ammonia, total [as NH3]monthly average≤ 17 mg/LJun–Oct
Nitrogen, ammonia, total [as NH3]monthly average≤ 4.7 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Flow, in conduit or thru treatment plantmonthly average≤ .7 MGDall 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≤ 150 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 230 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]7-day averagereport only (mg/L)all year
Solids, suspended percent removalmonthly average minimum≥ 70 %all year
Carbonaceous oxygen demand, % removalminimum≥ 65 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 65 %all year

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/NY0022331 · MCP: https://passage-data.com/mcp