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Ontario (T)

Sewage treatment plant, major discharger, Ontario, New York. NPDES permit NY0027171 expired Feb 28, 2023; its limits still apply. Last 12 months: over a limit 6 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (33 values), form Q quarterly (3 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 1 required value missing, 1 of 20 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], daily maximum> 100 lb/d≤ 100 lb/d—
November 2025BOD, carbonaceous [5 day, 20 C], daily maximum> 12 mg/L≤ 12 mg/L—
March 2026Flow, in conduit or thru treatment plant, monthly average1.5 MGD≤ 1 MGD50%
March 2026Flow, in conduit or thru treatment plant, monthly average1.5 MGD≤ 1 MGD50%
April 2026Flow, in conduit or thru treatment plant, monthly average1.3 MGD≤ 1 MGD30%
April 2026Flow, in conduit or thru treatment plant, monthly average1.3 MGD≤ 1 MGD30%

Limits in force (49)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximum≤ 10 mg/Lall year
Solids, total suspendeddaily maximum≤ 10 mg/Lall year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendeddaily maximum≤ 83.4 lb/dall year
Solids, total suspendeddaily maximum≤ 83 lb/dall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, settleabledaily maximum≤ .1 mL/Lall year
Solids, settleabledaily maximumreport only (mL/L)all year
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.8 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 10 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 15 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximum≤ 1 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Copper, total [as Cu]daily maximum≤ 21 ug/Lall year
Zinc, total [as Zn]daily maximum≤ 190 ug/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 1 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly average≤ 1 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly averagereport only (ug/L)May–Oct
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ 20 ug/LMay–Oct
Chlorine, total residualdaily maximum≤ 30 ug/LMay–Oct
Chlorine, total residualmonthly averagereport only (lb/d)May–Oct
Chlorine, total residualdaily maximumreport only (lb/d)May–Oct
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 50 ng/Lall year
Mercury, total [as Hg]daily maximumreport only (g/d)all year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Oct
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 12 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 100 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: New York's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NY0027171 · MCP: https://passage-data.com/mcp