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Hammond Sanitary District WWTP

Sewage treatment plant, major discharger, Hammond, Indiana. NPDES permit IN0023060, in force until Apr 30, 2027. Last 12 months: over a limit 6 times (last August 2026), 2 of 128 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (45 values), outfall 001 form AQ quarterly (60 values), outfall 005 form C monthly (4 values), outfall 006 form C monthly (4 values), outfall 007 form C monthly (4 values), outfall 008 form C monthly (4 values), and 6 more forms
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 3 required values missing, 4 of 140 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, maximum weekly average11.4 mg/L≤ 9.9 mg/L15%
April 2026Mercury, total recoverable, monthly average.0008 lb/d≤ .00052 lb/d54%
April 2026Mercury, total recoverable, monthly average1.6 ng/L≤ 1.3 ng/L23%
June 2026Mercury, total recoverable, monthly average.0007 lb/d≤ .00052 lb/d35%
June 2026Mercury, total recoverable, monthly average1.545 ng/L≤ 1.3 ng/L18%
August 2026Mercury, total recoverable, monthly average.00058 lb/d≤ .00052 lb/d12%

Limits in force (183)

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≤ 8.5 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 6.6 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 12.8 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 9.9 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 4823 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 3745 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 7263 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 5618 lb/dMay–Nov001
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year001
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≤ 1.25 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.27 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 709 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 721 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1929 lb/dMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 1986 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 averagereport only (mg/L)all year001
Cyanide, free [as free]monthly average≤ .0043 mg/Lall year001
Cyanide, free [as free]daily maximumreport only (mg/L)all year001
Cyanide, free [as free]daily maximum≤ .0085 mg/Lall year001
Cyanide, free [as free]monthly averagereport only (lb/d)all year001
Cyanide, free [as free]monthly average≤ 1.7 lb/dall year001
Cyanide, free [as free]daily maximumreport only (lb/d)all year001
Cyanide, free [as free]daily maximum≤ 3.4 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
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]monthly average≤ 330 mg/Lall year001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Chloride [as Cl]daily maximum≤ 660 mg/Lall year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Chloride [as Cl]monthly average≤ 130000 lb/dall year001
Chloride [as Cl]daily maximumreport only (lb/d)all year001
Chloride [as Cl]daily maximum≤ 270000 lb/dall year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Fluoride, total [as F]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Fluoride, total [as F]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Fluoride, total [as F]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Fluoride, total [as F]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Fluoride, total [as F]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Fluoride, total [as F]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Iron, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
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 (lb/d)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (mg/L)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 (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (lb/d)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
Zinc, 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 (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (lb/d)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
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 (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (lb/d)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
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 (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (lb/d)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
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phenolics, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phenolics, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phenolics, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Phenolics, total recoverabledaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Phenolics, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phenolics, 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≤ .008 mg/LApr–Oct001
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct001
Chlorine, total residualmonthly average≤ 4.5 lb/dApr–Oct001
Chlorine, total residualdaily maximum< 34 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
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)Apr–Oct001
Number of Eventsmonthly totalreport only (# exceed)Apr–Oct001
Number of Eventsmonthly totalreport only (#)Apr–Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteApr, Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMay, Nov001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMay, Nov001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicApr, Oct001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicMay, Nov001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicMay, Nov001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteApr, Oct001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMay, Nov001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMay, Nov001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicApr, Oct001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicMay, Nov001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicMay, Nov001
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Mercury, total recoverablemonthly average≤ 1.3 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximum≤ 3.2 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverablemonthly average≤ .00052 lb/dFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximum≤ .0013 lb/dFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7.1 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5.5 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 10.7 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 8.3 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4029 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3121 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 6072 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 4710 lb/dMay–Nov001
Phosphorus, total percent removalmonthly average minimum≥ 60 %all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Durationmonthly totalreport only (hr/mo)all year005
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year005
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year005
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year005
Durationmonthly totalreport only (hr/mo)all year006
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year006
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year006
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year006
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 (#/mo)all year007
Durationmonthly totalreport only (hr/mo)all year008
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year008
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year008
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year008
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 (#/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 (#/mo)all year010
Durationmonthly totalreport only (hr/mo)all year011
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year011
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year011
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year011
Durationmonthly totalreport only (hr/mo)all year012
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year012
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year012
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year012
Durationmonthly totalreport only (hr/mo)all year014
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year014
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year014
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year014
Durationmonthly totalreport only (hr/mo)all year022
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year022
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year022
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year022

How strict are these limits?

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

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