HAMMOND SANITARY DISTRICT WWTP

NPDES permit IN0023060 · Major POTW · effective, expires 2027-04-30 · 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

5values over a limit
0required values missing, on 0 form(s)
2of 129 forms filed late

Last period with anything received: 2026-07-31. Most often over: Mercury, total recoverable (4), Solids, total suspended (1).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (183)

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 <= 8.5 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 6.6 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMX WK AV <= 12.8 mg/L Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMX WK AV <= 9.9 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 4823 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMO AVG <= 3745 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Solids, total suspendedMX WK AV <= 7263 lb/d Jan, Feb, Mar, Apr, Dec
001Solids, total suspendedMX WK AV <= 5618 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
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 <= 1.25 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 1.27 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3.4 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 3.5 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 709 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 721 lb/d Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 1929 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 1986 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]MO AVG report only all year
001Cyanide, free [as free]MO AVG <= .0043 mg/L all year
001Cyanide, free [as free]DAILY MX report only all year
001Cyanide, free [as free]DAILY MX <= .0085 mg/L all year
001Cyanide, free [as free]MO AVG report only all year
001Cyanide, free [as free]MO AVG <= 1.7 lb/d all year
001Cyanide, free [as free]DAILY MX report only all year
001Cyanide, free [as free]DAILY MX <= 3.4 lb/d all year
001Cyanide, free [as free]MO AVG report only all year
001Cyanide, free [as free]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]MO AVG <= 330 mg/L all year
001Chloride [as Cl]DAILY MX report only all year
001Chloride [as Cl]DAILY MX <= 660 mg/L all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]MO AVG <= 130000 lb/d all year
001Chloride [as Cl]DAILY MX report only all year
001Chloride [as Cl]DAILY MX <= 270000 lb/d all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]DAILY MX report only all year
001Sulfate, total [as SO4]DAILY MX report only Mar, Jun, Sep, Dec
001Sulfate, total [as SO4]DAILY MX report only Mar, Jun, Sep, Dec
001Sulfate, total [as SO4]DAILY MX report only Mar, Jun, Sep, Dec
001Sulfate, total [as SO4]DAILY MX report only Mar, Jun, Sep, Dec
001Sulfate, total [as SO4]DAILY MX report only Mar, Jun, Sep, Dec
001Sulfate, total [as SO4]DAILY MX report only Mar, Jun, Sep, Dec
001Fluoride, total [as F]DAILY MX report only Mar, Jun, Sep, Dec
001Fluoride, total [as F]DAILY MX report only Mar, Jun, Sep, Dec
001Fluoride, total [as F]DAILY MX report only Mar, Jun, Sep, Dec
001Fluoride, total [as F]DAILY MX report only Mar, Jun, Sep, Dec
001Fluoride, total [as F]DAILY MX report only Mar, Jun, Sep, Dec
001Fluoride, total [as F]DAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Iron, total recoverableDAILY 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
001Nickel, total recoverableDAILY 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
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
001Zinc, 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
001Zinc, 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
001Lead, 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
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
001Chromium, 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
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
001Copper, 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
001Copper, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Phenolics, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Phenolics, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Phenolics, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Phenolics, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Phenolics, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Phenolics, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Chlorine, total residualMO AVG <= .008 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualDAILY MX < .06 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualMO AVG <= 4.5 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualDAILY MX < 34 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
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
001E. coli, colony forming units [CFU]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Number of EventsMO TOTAL report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Number of EventsMO TOTAL report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute Apr, Oct
001Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute May, Nov
001Toxicity [acute], Ceriodaphnia dubiaMAXIMUM <= 1 tox acute May, Nov
001Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1 tox chronic Apr, Oct
001Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1 tox chronic May, Nov
001Toxicity [chronic], Ceriodaphnia dubiaMAXIMUM <= 1 tox chronic May, Nov
001Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute Apr, Oct
001Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute May, Nov
001Toxicity [acute], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox acute May, Nov
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox chronic Apr, Oct
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox chronic May, Nov
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]MAXIMUM <= 1 tox chronic May, Nov
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
001Mercury, total recoverableMO AVG <= 1.3 ng/L Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableDAILY MX <= 3.2 ng/L Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableMO AVG <= .00052 lb/d Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableDAILY MX <= .0013 lb/d 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 <= 7.1 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 5.5 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 10.7 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 8.3 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 4029 lb/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 3121 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 6072 lb/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 4710 lb/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Phosphorus, total percent removalMO AV MN >= 60 % all year
001Flow, totalMO 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
009DurationMO TOTAL report only all year
009Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
009Precipitation, monthly accumulationMO TOTAL report only all year
009Discharge 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
011DurationMO TOTAL report only all year
011Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
011Precipitation, monthly accumulationMO TOTAL report only all year
011Discharge 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
014DurationMO TOTAL report only all year
014Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
014Precipitation, monthly accumulationMO TOTAL report only all year
014Discharge event observation [Visual Monitoring]MO TOTAL report only all year
022DurationMO TOTAL report only all year
022Overflow volume [SS0 volume, CSO volume]MO TOTAL report only all year
022Precipitation, monthly accumulationMO TOTAL report only all year
022Discharge event observation [Visual Monitoring]MO TOTAL report only all year

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