COLUMBUS WWTP, CITY OF

NPDES permit IN0032573 · Major POTW · effective, expires 2030-03-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
2of 30 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 27 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (67)

OutfallParameterStatisticLimitMonths
010pHDAILY MN report only all year
010pHDAILY MX report only all year
010Solids, total suspendedMO AVG report only all year
010Solids, total suspendedDAILY MX report only all year
010Flow, in conduit or thru treatment plantMO AVG report only all year
010Flow, in conduit or thru treatment plantMX WK AV report only all year
010Chlorine, total residualMO AVG < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
010Chlorine, total residualDAILY MX < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
010E. coli, colony forming units [CFU]MO GEO <= 125 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
010E. coli, colony forming units [CFU]DAILY MX <= 235 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
010BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
010BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
010Flow, totalMO TOTAL report only all year
011Oxygen, dissolved [DO]DAILY MN >= 4 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
011Oxygen, dissolved [DO]DLYAVMIN report only Jan, Feb, Mar, Apr, Dec
011pHDAILY MN >= 6 SU all year
011pHDAILY MX <= 9 SU all year
011Solids, total suspendedMO AVG <= 30 mg/L all year
011Solids, total suspendedMX WK AV <= 45 mg/L all year
011Solids, total suspendedMO AVG <= 9764 lb/d all year
011Solids, total suspendedMX WK AV <= 14645 lb/d all year
011Nitrogen, total [as N]MO AVG report only all year
011Nitrogen, total [as N]MO AVG report only all year
011Nitrogen, ammonia total [as N]MO AVG <= 4.4 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
011Nitrogen, ammonia total [as N]MO AVG <= 6.2 mg/L Jan, Feb, Mar, Apr, Dec
011Nitrogen, ammonia total [as N]MX WK AV <= 6.6 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
011Nitrogen, ammonia total [as N]MX WK AV <= 9.3 mg/L Jan, Feb, Mar, Apr, Dec
011Nitrogen, ammonia total [as N]MO AVG <= 1432 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
011Nitrogen, ammonia total [as N]MO AVG <= 2018 lb/d Jan, Feb, Mar, Apr, Dec
011Nitrogen, ammonia total [as N]MX WK AV <= 2148 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
011Nitrogen, ammonia total [as N]MX WK AV <= 3027 lb/d Jan, Feb, Mar, Apr, Dec
011Phosphorus, total [as P]MO AVG <= 1 mg/L all year
011Phosphorus, total [as P]MO AVG report only all year
011Cyanide, free [as free]DAILY MX report only Mar, Jun, Sep, Dec
011Cyanide, free [as free]DAILY MX report only Mar, Jun, Sep, Dec
011Nickel, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Nickel, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Zinc, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Zinc, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Cadmium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Cadmium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Lead, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Lead, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Chromium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Chromium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Copper, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Copper, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
011Flow, in conduit or thru treatment plantMO AVG report only all year
011E. coli, colony forming units [CFU]MO GEO <= 125 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
011E. coli, colony forming units [CFU]DAILY MX <= 235 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
011Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute Mar, Sep
011Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute Apr, Oct
011Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute Apr, Oct
011Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1.6 tox chronic Mar, Sep
011Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1.6 tox chronic Apr, Oct
011Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1.6 tox chronic Apr, Oct
011Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute Mar, Sep
011Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute Apr, Oct
011Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute Apr, Oct
011Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1.6 tox chronic Mar, Sep
011Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1.6 tox chronic Apr, Oct
011Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1.6 tox chronic Apr, Oct
011BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
011BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
011BOD, carbonaceous [5 day, 20 C]MO AVG <= 8136 lb/d all year
011BOD, carbonaceous [5 day, 20 C]MX WK AV <= 13018 lb/d all year
011Flow, totalMO TOTAL report only all year

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