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Auburn WWTP

Sewage treatment plant, major discharger, Auburn, Indiana. NPDES permit IN0020672, in force until Sep 30, 2030. Last 12 months: over a limit 8 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (34 values), outfall 001 form TS twice a year (4 values), outfall 007 form C monthly (4 values), outfall 009 form C monthly (4 values), outfall 010 form C monthly (4 values), outfall 011 form CP monthly (13 values), and 1 more form
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 3 required values missing, 5 of 68 reports late

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

Period endingOutfallParameterReportedLimitOver by
January 2026001Nitrogen, ammonia total [as N], daily maximum7.8 mg/L≤ 3.9 mg/L100%
March 2026001Cyanide, free [as free], daily maximum.023 mg/L≤ .0091 mg/L153%
March 2026001Cyanide, free [as free], daily maximum< .9 lb/d≤ .34 lb/d165%
March 2026001Cyanide, free [as free], monthly average< .008 mg/L≤ .0045 mg/L78%
March 2026001Cyanide, free [as free], monthly average< .29 lb/d≤ .17 lb/d71%
April 2026011Chlorine, total residual, daily maximum2.2 mg/L< .06 mg/L3567%
April 2026011Chlorine, total residual, monthly average.54 mg/L< .06 mg/L800%
April 2026011E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%

Limits in force (106)

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≤ 1126.6 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 675.9 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 1689.9 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 1014 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≤ 1.6 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/LMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 60.1 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 63.8 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 135.2 lb/dMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 146.5 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
Cyanide, free [as free]monthly average≤ .0045 mg/Lall year001
Cyanide, free [as free]daily maximum≤ .0091 mg/Lall year001
Cyanide, free [as free]monthly average≤ .17 lb/dall year001
Cyanide, free [as free]daily maximum≤ .34 lb/dall year001
Cyanide, free [as free]monthly averagereport only (mg/L)all year001
Cyanide, free [as free]daily maximumreport only (mg/L)all year001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average≤ .01 mg/LApr–Oct001
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct001
Chlorine, total residualmonthly average≤ .38 lb/dApr–Oct001
Chlorine, total residualdaily maximum< 2.25 lb/dApr–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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Mar, Sep001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Apr, Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Apr, Oct001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicMar, Sep001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicApr, Oct001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.1 tox chronicApr, Oct001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Mar, Sep001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Apr, Oct001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Apr, Oct001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicMar, Sep001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicApr, Oct001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.1 tox chronicApr, Oct001
Mercury, total recoverableannual average≤ 4 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (lb/d)Feb, Apr, Jun, Aug, Oct, Dec001
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≤ 938.8 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 563.3 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 1502.1 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 863.7 lb/dMay–Nov001
Phosphorus, total percent removalmonthly average minimum≥ 65 %all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Durationmonthly totalreport only (hr/mo)all year007
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year007
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year007
Discharge event observation [Visual Monitoring]monthly totalreport only (occur/mo)all year007
Durationmonthly totalreport only (hr/mo)all year009
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year009
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year009
Discharge event observation [Visual Monitoring]monthly totalreport only (occur/mo)all year009
Durationmonthly totalreport only (hr/mo)all year010
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year010
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year010
Discharge event observation [Visual Monitoring]monthly totalreport only (occur/mo)all year010
pHdaily minimumreport only (SU)all year011
pHdaily maximumreport only (SU)all year011
Solids, total suspendedmonthly averagereport only (mg/L)all year011
Solids, total suspendeddaily maximumreport only (mg/L)all year011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year011
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year011
Chlorine, total residualmonthly average< .06 mg/LApr–Oct011
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct011
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct011
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct011
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year011
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year011
Flow, totalmonthly totalreport only (Mgal/mo)all year011

How strict are these limits?

Cited limits by parameter: Indiana's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/IN0020672 · MCP: https://passage-data.com/mcp