COLUMBIA CITY WWTP

NPDES permit IN0022624 · Major POTW · effective, expires 2027-12-31 · EPA's file as of 2026-09-19

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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

12values over a limit
0required values missing, on 0 form(s)
1of 140 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (11), E. coli, colony forming units [CFU] (1).

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (121)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DLYAVMIN >= 6 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Oxygen, dissolved [DO]DLYAVMIN >= 5 mg/L Jan, Feb, Mar, Apr, Dec
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 18 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMX WK AV <= 27 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 2879 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 1727 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMX WK AV <= 4319 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMX WK AV <= 2591 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 3 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 2.3 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MX WK AV <= 4.5 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 144 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 288 lb/d Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 221 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MX WK AV <= 432 lb/d Jan, Feb, Mar, Apr, Dec
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]MO AVG report only all year
001Cyanide, free [as free]DAILY MX report only Mar, Jun, Sep, Dec
001Cyanide, free [as free]DAILY MX report only Mar, Jun, Sep, Dec
001Nickel, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Nickel, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Zinc, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Zinc, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Cadmium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Cadmium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Lead, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Lead, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Chromium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Chromium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Copper, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Copper, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantMO AVG report only all year
001E. coli, colony forming units [CFU]MO GEO <= 125 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, colony forming units [CFU]DAILY MX <= 235 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute (alert) Dec
001Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute (alert) Jan
001Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1.2 tox chronic (alert) Dec
001Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1.2 tox chronic (alert) Jan
001Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute (alert) Dec
001Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute (alert) Jan
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1.2 tox chronic (alert) Dec
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1.2 tox chronic (alert) Jan
001Mercury, total recoverableMO AVG <= 12 ng/L Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableDAILY MX <= 20 ng/L Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 23 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 2399 lb/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 1440 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 3839 lb/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 2207 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Flow, totalMO TOTAL report only all year
002DurationMO TOTAL report only all year
002Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
002Precipitation, monthly accumulationMO TOTAL report only all year
002Discharge event observation [Visual Monitoring]MO TOTAL report only all year
004DurationMO TOTAL report only all year
004Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
004Precipitation, monthly accumulationMO TOTAL report only all year
004Discharge event observation [Visual Monitoring]MO TOTAL report only all year
005DurationMO TOTAL report only all year
005Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
005Precipitation, monthly accumulationMO TOTAL report only all year
005Discharge event observation [Visual Monitoring]MO TOTAL report only all year
006DurationMO TOTAL report only all year
006Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
006Precipitation, monthly accumulationMO TOTAL report only all year
006Discharge event observation [Visual Monitoring]MO TOTAL report only all year
007DurationMO TOTAL report only all year
007Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
007Precipitation, monthly accumulationMO TOTAL report only all year
007Discharge event observation [Visual Monitoring]MO TOTAL report only all year
008DurationMO TOTAL report only all year
008Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
008Precipitation, monthly accumulationMO TOTAL report only all year
008Discharge event observation [Visual Monitoring]MO TOTAL report only all year
010DurationMO TOTAL report only all year
010Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
010Precipitation, monthly accumulationMO TOTAL report only all year
010Discharge event observation [Visual Monitoring]MO TOTAL report only all year
012DurationMO TOTAL report only all year
012Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
012Precipitation, monthly accumulationMO TOTAL report only all year
012Discharge event observation [Visual Monitoring]MO TOTAL report only all year
015DurationMO TOTAL report only all year
015Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
015Precipitation, monthly accumulationMO TOTAL report only all year
015Discharge event observation [Visual Monitoring]MO TOTAL report only all year
016DurationMO TOTAL report only all year
016Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
016Precipitation, monthly accumulationMO TOTAL report only all year
016Discharge event observation [Visual Monitoring]MO TOTAL report only all year
019pHDAILY MN report only all year
019pHDAILY MX report only all year
019Solids, total suspendedMO AVG report only all year
019Solids, total suspendedDAILY MX report only all year
019Flow, in conduit or thru treatment plantMO AVG report only all year
019Flow, in conduit or thru treatment plantMX WK AV report only all year
019Chlorine, total residualMO AVG < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
019Chlorine, total residualDAILY MX < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
019E. coli, colony forming units [CFU]MO GEO <= 125 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
019E. coli, colony forming units [CFU]DAILY MX <= 235 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
019BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
019BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
019Flow, totalMO TOTAL report only all year
PRTCopper, dry weightVALUE report only Jun, Dec
PRTCadmium, dry weightVALUE report only Jun, Dec
PRTMolybdenum, sludge, total, dry weight [as Mo]VALUE report only Jun, Dec
PRTZinc, sludge, total, dry weight [as Zn]VALUE report only Jun, Dec
PRTLead, sludge, total, dry weight [as Pb]VALUE report only Jun, Dec
PRTNickel, sludge, total, dry weight [as Ni]VALUE report only Jun, Dec
PRTMercury, sludge, total, dry weight [as Hg]VALUE report only Jun, Dec

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states