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Lewisboro (T)

Sewage treatment plant, South Salem, New York. NPDES permit NY0030767, in force until Apr 30, 2031. Last 12 months: over a limit 7 times (last May 2026), 5 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
March 2026Solids, total suspended, daily maximum5.2 mg/L≤ 5 mg/L4%
April 2026Solids, total suspended, daily maximum17 mg/L≤ 5 mg/L240%
April 2026Solids, total suspended, daily maximum6.52 lb/d≤ 3.33 lb/d96%
May 2026Nitrogen, ammonia, total [as NH3], daily maximum26.6 mg/L≤ 2 mg/L1230%
May 2026Phosphorus, total [as P], daily maximum.66 mg/L≤ .5 mg/L32%
May 2026Solids, total suspended, daily maximum14.89 lb/d≤ 3.3 lb/d351%
May 2026Solids, total suspended, daily maximum35 mg/L≤ 5 mg/L600%

Limits in force (26)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8 SUall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximum≤ 5 mg/Lall year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendeddaily maximum≤ 3.3 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, settleabledaily maximum≤ .1 mL/Lall year
Phosphorus, total [as P]daily maximum≤ .5 mg/Lall year
Nitrogen, ammonia, total [as NH3]daily maximum≤ 2 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia, total [as NH3]daily maximum≤ 1.5 mg/LJun–Oct
Coliform, fecal MPN + membrane ftl 44.5 Cdaily maximum≤ 10 #/100mLall year
Flow, in conduit or thru treatment plantmonthly average≤ .08 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 3.3 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NY0030767 · MCP: https://passage-data.com/mcp