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Columbus WWTP, City of

Sewage treatment plant, major discharger, Columbus, Indiana. NPDES permit IN0032573, in force until Mar 31, 2030. Last 12 months: no values over a limit, 2 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 27 days after each period: outfall 010 form CP monthly (13 values), outfall 011 form A monthly (23 values), outfall 011 form AQ quarterly (14 values), outfall 011 form TS twice a year (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 1 required value missing, 1 of 32 reports late

Limits in force (67)

ParameterStatisticLimitMonthsOutfall
pHdaily minimumreport only (SU)all year010
pHdaily maximumreport only (SU)all year010
Solids, total suspendedmonthly averagereport only (mg/L)all year010
Solids, total suspendeddaily maximumreport only (mg/L)all year010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010
Flow, in conduit or thru treatment plantmaximum weekly averagereport only (MGD)all year010
Chlorine, total residualmonthly average< .06 mg/LApr–Oct010
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct010
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct010
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct010
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year010
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year010
Flow, totalmonthly totalreport only (Mgal/mo)all year010
Oxygen, dissolved [DO]daily minimum≥ 4 mg/LMay–Nov011
Oxygen, dissolved [DO]daily average minimumreport only (mg/L)Jan, Feb, Mar, Apr, Dec011
pHdaily minimum≥ 6 SUall year011
pHdaily maximum≤ 9 SUall year011
Solids, total suspendedmonthly average≤ 30 mg/Lall year011
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year011
Solids, total suspendedmonthly average≤ 9764 lb/dall year011
Solids, total suspendedmaximum weekly average≤ 14645 lb/dall year011
Nitrogen, total [as N]monthly averagereport only (mg/L)all year011
Nitrogen, total [as N]monthly averagereport only (lb/d)all year011
Nitrogen, ammonia total [as N]monthly average≤ 4.4 mg/LMay–Nov011
Nitrogen, ammonia total [as N]monthly average≤ 6.2 mg/LJan, Feb, Mar, Apr, Dec011
Nitrogen, ammonia total [as N]maximum weekly average≤ 6.6 mg/LMay–Nov011
Nitrogen, ammonia total [as N]maximum weekly average≤ 9.3 mg/LJan, Feb, Mar, Apr, Dec011
Nitrogen, ammonia total [as N]monthly average≤ 1432 lb/dMay–Nov011
Nitrogen, ammonia total [as N]monthly average≤ 2018 lb/dJan, Feb, Mar, Apr, Dec011
Nitrogen, ammonia total [as N]maximum weekly average≤ 2148 lb/dMay–Nov011
Nitrogen, ammonia total [as N]maximum weekly average≤ 3027 lb/dJan, Feb, Mar, Apr, Dec011
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year011
Phosphorus, total [as P]monthly averagereport only (lb/d)all year011
Cyanide, free [as free]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Cyanide, free [as free]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year011
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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMar, Sep011
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteApr, Oct011
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteApr, Oct011
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.6 tox chronicMar, Sep011
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.6 tox chronicApr, Oct011
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.6 tox chronicApr, Oct011
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMar, Sep011
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteApr, Oct011
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteApr, Oct011
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.6 tox chronicMar, Sep011
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.6 tox chronicApr, Oct011
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.6 tox chronicApr, Oct011
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year011
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year011
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8136 lb/dall year011
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 13018 lb/dall 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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IN0032573 · MCP: https://passage-data.com/mcp