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Thorntown WWTP

Sewage treatment plant, Thorntown, Indiana. NPDES permit IN0024589, in force until Jul 31, 2029. Last 12 months: over a limit 13 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (26 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 22 required values missing, 2 of 16 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average53.2 mg/L≤ 25 mg/L113%
October 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average273 mg/L≤ 40 mg/L583%
October 2025Chlorine, total residual, daily maximum.17 mg/L< .06 mg/L183%
December 2025Copper, total recoverable, daily maximum.418 mg/L≤ .098 mg/L327%
December 2025Copper, total recoverable, monthly average.143 mg/L≤ .049 mg/L192%
January 2026Copper, total recoverable, daily maximum.132 mg/L≤ .098 mg/L35%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average26.2 mg/L≤ 25 mg/L5%
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average86.916 lb/d≤ 83 lb/d5%
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average89.78 mg/L≤ 40 mg/L124%
April 2026Copper, total recoverable, daily maximum.249 mg/L≤ .098 mg/L154%
April 2026Copper, total recoverable, monthly average.054 mg/L≤ .049 mg/L10%
May 2026Copper, total recoverable, daily maximum.269 mg/L≤ .098 mg/L174%
May 2026Copper, total recoverable, monthly average.084 mg/L≤ .049 mg/L71%

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 63 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 94 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 4.8 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 7.2 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 7.2 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 10.8 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 10 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 15 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 15 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 23 lb/dJan, Feb, Mar, Apr, Dec001
Copper, total recoverablemonthly average≤ .049 mg/Lall year001
Copper, total recoverabledaily maximum≤ .098 mg/Lall year001
Copper, total recoverablemonthly averagereport only (mg/L)all year001
Copper, total recoverabledaily maximumreport only (mg/L)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
Chlorine, total residualdaily minimum≥ .5 mg/LApr–Oct001
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct001
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLall year001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJul001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteAug001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteAug001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 3.7 tox chronicJul001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 3.7 tox chronicAug001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 3.7 tox chronicAug001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJul001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteAug001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteAug001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 3.7 tox chronicJul001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 3.7 tox chronicAug001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 3.7 tox chronicAug001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 52 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 83 lb/dall year001
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/IN0024589 · MCP: https://passage-data.com/mcp