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Winchester WWTP

Sewage treatment plant, major discharger, Winchester, Indiana. NPDES permit IN0021024, in force until Sep 30, 2030. Last 12 months: over a limit once (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (28 values), form TA yearly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily maximum.09 mg/L< .06 mg/L50%

Limits in force (63)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov001
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 12 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 18 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 451 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 180 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 676 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 270 lb/dMay–Nov001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.3 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 3 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 22.5 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 30 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 34.5 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 45.1 lb/dJan, Feb, Mar, Apr, Dec001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average< .06 mg/LApr–Oct001
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct001
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct001
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)Apr–Oct001
Number of Eventsmonthly totalreport only (# exceed)Apr–Oct001
Number of Eventsmonthly totalreport only (#)Apr–Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteOct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteSep001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicOct001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicSep001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteOct001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteSep001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicOct001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicSep001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 376 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 150 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 601 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 225 lb/dMay–Nov001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Copper, dry weightvaluereport only (mg/kg)Jun, DecPRT
Copper, dry weightvaluereport only (mg/kg)Jun, DecPRT
Cadmium, dry weightvaluereport only (mg/kg)Jun, DecPRT
Cadmium, dry weightvaluereport only (mg/kg)Jun, DecPRT
Molybdenum, sludge, total, dry weight [as Mo]valuereport only (mg/kg)Jun, DecPRT
Molybdenum, sludge, total, dry weight [as Mo]valuereport only (mg/kg)Jun, DecPRT
Zinc, sludge, total, dry weight [as Zn]valuereport only (mg/kg)Jun, DecPRT
Zinc, sludge, total, dry weight [as Zn]valuereport only (mg/kg)Jun, DecPRT
Lead, sludge, total, dry weight [as Pb]valuereport only (mg/kg)Jun, DecPRT
Lead, sludge, total, dry weight [as Pb]valuereport only (mg/kg)Jun, DecPRT
Nickel, sludge, total, dry weight [as Ni]valuereport only (mg/kg)Jun, DecPRT
Nickel, sludge, total, dry weight [as Ni]valuereport only (mg/kg)Jun, DecPRT
Mercury, sludge, total, dry weight [as Hg]valuereport only (mg/kg)Jun, DecPRT
Mercury, sludge, total, dry weight [as Hg]valuereport only (mg/kg)Jun, DecPRT

How strict are these limits?

Cited limits by parameter: Indiana'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/IN0021024 · MCP: https://passage-data.com/mcp