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Niskayuna (T)

Sewage treatment plant, major discharger, Schenectady, New York. NPDES permit NY0023973 expired May 31, 2024; its limits still apply. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form X monthly (26 values), form Q quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 19 reports late

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

Period endingParameterReportedLimitOver by
February 2026Coliform, fecal general, 30-day geometric mean345 MPN/100mL≤ 200 MPN/100mL73%
February 2026Coliform, fecal general, 7-day geometric mean2419.6 MPN/100mL≤ 400 MPN/100mL505%
March 2026Coliform, fecal general, 30-day geometric mean2419.6 MPN/100mL≤ 200 MPN/100mL1110%
May 2026Coliform, fecal general, 7-day geometric mean> 2419.6 MPN/100mL≤ 400 MPN/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2419.6 MPN/100mL≤ 400 MPN/100mL—

Limits in force (27)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 750 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 1100 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 750 lb/dall year
Solids, total suspended7-day average≤ 1100 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, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly average≤ 3 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Coliform, fecal general30-day geometric mean≤ 200 MPN/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 MPN/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

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/NY0023973 · MCP: https://passage-data.com/mcp