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Williamson (T)

Sewage treatment plant, Williamson, New York. NPDES permit NY0108723, in force until Feb 28, 2027. Last 12 months: over a limit 6 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (24 values)
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value 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, 30-day arithmetic mean.846 MGD≤ .625 MGD35%
April 2026Flow, in conduit or thru treatment plant, 30-day arithmetic mean.789 MGD≤ .625 MGD26%
August 2026BOD, 5-day, 20 deg. C, 30-day average34 mg/L≤ 30 mg/L13%
August 2026BOD, 5-day, 20 deg. C, 7-day average56 mg/L≤ 45 mg/L24%
August 2026BOD, 5-day, percent removal, monthly average minimum83 %≥ 85 %13%
August 2026pH, minimum5.4 SU≥ 6 SU—

Limits in force (24)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 156 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 234 lb/dall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 156 lb/dall year
Solids, total suspended7-day average≤ 234 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, settleabledaily maximum≤ .3 mL/Lall year
Solids, settleabledaily maximumreport only (mL/L)all year
Flow, in conduit or thru treatment plant30-day arithmetic mean≤ .625 MGDall year
Chlorine, total residualdaily maximum≤ .25 mg/Lall year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year
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.

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/NY0108723 · MCP: https://passage-data.com/mcp