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Corydon WWTP

Sewage treatment plant, major discharger, Corydon, Indiana. NPDES permit IN0020893, in force until Jun 30, 2028. Last 12 months: over a limit 6 times (last February 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values)
Renewal application due
Jan 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 3 of 16 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], monthly average9.145 mg/L≤ 1.9 mg/L381%
January 2026Nitrogen, ammonia total [as N], maximum weekly average25.66 mg/L≤ 2.9 mg/L785%
January 2026Nitrogen, ammonia total [as N], maximum weekly average72.49 lb/d≤ 48.4 lb/d50%
February 2026Nitrogen, ammonia total [as N], monthly average10.26 mg/L≤ 1.9 mg/L440%
February 2026Nitrogen, ammonia total [as N], maximum weekly average28.84 mg/L≤ 2.9 mg/L894%
February 2026Nitrogen, ammonia total [as N], maximum weekly average74.57 lb/d≤ 48.4 lb/d54%

Limits in force (57)

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≤ 18 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 27 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 501 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 300 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 751 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 451 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≤ 1.3 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.9 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 21.7 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 31.7 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 33.4 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 48.4 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
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
Number of Eventsmonthly totalreport only (# exceed)Apr–Oct001
Number of Eventsmonthly totalreport only (#)Apr–Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJun001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJul001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJul001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicJun001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicJul001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicJul001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJun001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJul001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJul001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicJun001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicJul001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicJul001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 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≤ 23 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 417 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 250 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 668 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 384 lb/dMay–Nov001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Copper, 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
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
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

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/IN0020893 · MCP: https://passage-data.com/mcp