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Darien (T)

Sewage treatment plant, Darien Center, New York. NPDES permit NY0228346, in force until Jun 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (24 values), form Q quarterly (2 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (48)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Flow ratemonthly average≤ 64500 gal/dall year
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall 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≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 10 mg/Lall year
Solids, total suspendeddaily maximum≤ 20 mg/LJun–Oct
Solids, total suspendeddaily maximum≤ 10 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 45 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 16.1 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 5.4 lb/dall year
Solids, total suspendeddaily maximum≤ 10.8 lb/dJun–Oct
Solids, total suspendeddaily maximum≤ 5.4 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 24.2 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
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 NH3]monthly average≤ 1.2 mg/LJun–Oct
Nitrogen, ammonia, total [as NH3]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia, total [as NH3]daily maximum≤ 7 mg/L (alert, not enforceable)Jun–Oct
Nitrogen, ammonia, total [as NH3]daily maximum≤ 31 mg/L (alert, not enforceable)Jan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia, total [as NH3]monthly average≤ .65 lb/dJun–Oct
Nitrogen, ammonia, total [as NH3]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia, total [as NH3]daily maximumreport only (lb/d) (alert, not enforceable)Jun–Oct
Nitrogen, ammonia, total [as NH3]daily maximumreport only (lb/d) (alert, not enforceable)Jan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia, total [as NH3]monthly averagereport only (mg/L)all year
Chlorine, total residualdaily maximum≤ 30 ug/LMay–Oct
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (lb/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 average≤ 25 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 38 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 13.5 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2.7 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20.5 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2.7 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 16.1 lb/dJun–Oct
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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NY0228346 · MCP: https://passage-data.com/mcp