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Oswego (T)

Sewage treatment plant, Oswego, New York. NPDES permit NY0029238, in force until Oct 31, 2030. Last 12 months: over a limit 20 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (27 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
31 values over a limit, 6 required values missing, 3 of 12 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average.35 lb/d≤ .18 lb/d94%
November 2025BOD, 5-day, 20 deg. C, monthly average10 mg/L≤ 5 mg/L100%
December 2025BOD, 5-day, 20 deg. C, monthly average9 mg/L≤ 5 mg/L80%
January 2026BOD, 5-day, 20 deg. C, monthly average7 mg/L≤ 5 mg/L40%
February 2026BOD, 5-day, 20 deg. C, monthly average6 mg/L≤ 5 mg/L20%
April 2026BOD, 5-day, 20 deg. C, monthly average.88 lb/d≤ .4 lb/d120%
April 2026BOD, 5-day, percent removal, monthly average minimum74 %≥ 85 %73%
April 2026Nitrogen, ammonia total [as N], monthly average.47 lb/d≤ .27 lb/d74%
April 2026Solids, suspended percent removal, monthly average minimum82 %≥ 85 %20%
May 2026Oxygen, dissolved [DO], daily minimum2.45 mg/L≥ 7 mg/L65%
June 2026BOD, 5-day, 20 deg. C, monthly average.46 lb/d≤ .4 lb/d15%
June 2026BOD, 5-day, 20 deg. C, monthly average11 mg/L≤ 5 mg/L120%
June 2026Nitrogen, ammonia total [as N], monthly average.37 lb/d≤ .075 lb/d393%
June 2026Nitrogen, ammonia total [as N], monthly average8.82 mg/L≤ .9 mg/L880%
June 2026Oxygen, dissolved [DO], daily minimum3.4 mg/L≥ 7 mg/L51%
July 2026BOD, 5-day, 20 deg. C, monthly average11 mg/L≤ 5 mg/L120%
July 2026Nitrogen, ammonia total [as N], monthly average.37 lb/d≤ .075 lb/d393%
July 2026Nitrogen, ammonia total [as N], monthly average8.82 mg/L≤ .9 mg/L880%
July 2026Oxygen, dissolved [DO], daily minimum3.51 mg/L≥ 7 mg/L50%
August 2026Oxygen, dissolved [DO], daily minimum3.61 mg/L≥ 7 mg/L48%

Limits in force (30)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Flow ratemonthly average≤ 10000 gal/dJun–Oct
Flow ratemonthly average≤ 10000 gal/dJan, Feb, Mar, Apr, May, Nov, Dec
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ .4 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≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 10 mg/Lall year
Solids, total suspendedmonthly average≤ .8 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, settleabledaily maximum≤ .1 mL/Lall year
Solids, settleabledaily maximumreport only (mL/L)all year
Nitrogen, ammonia total [as N]monthly average≤ .9 mg/LJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .075 lb/dJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ .15 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Chlorine, total residualdaily maximum≤ .03 mg/LMay–Oct
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Oct
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %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/NY0029238 · MCP: https://passage-data.com/mcp