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Laporte WWTP

Sewage treatment plant, major discharger, La Porte, Indiana. NPDES permit IN0025577, in force until Feb 28, 2030. Last 12 months: over a limit 8 times (last July 2026), 3 required values missing, 6 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (29 values), outfall 001 form AQ quarterly (28 values), outfall 001 form TX twice a year (8 values), outfall 002 form C monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 28 required values missing, 5 of 32 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, colony forming units [CFU], daily maximum263 CFU/100mL≤ 235 CFU/100mL12%
October 2025Nitrogen, ammonia total [as N], maximum weekly average3.54 mg/L≤ 2.4 mg/L48%
December 2025Nitrogen, ammonia total [as N], monthly average1.94 mg/L≤ 1.8 mg/L8%
January 2026Nitrogen, ammonia total [as N], monthly average2.61 mg/L≤ 1.8 mg/L45%
January 2026Nitrogen, ammonia total [as N], maximum weekly average4.2 mg/L≤ 2.7 mg/L56%
February 2026Nitrogen, ammonia total [as N], monthly average2.59 mg/L≤ 1.8 mg/L44%
February 2026Nitrogen, ammonia total [as N], maximum weekly average3.71 mg/L≤ 2.7 mg/L37%
July 2026E. coli, colony forming units [CFU], daily maximum1000 CFU/100mL≤ 235 CFU/100mL326%

Limits in force (85)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 24 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 36 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 2504 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 2003 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 3755 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 3004 lb/dMay–Nov001
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≤ 1.6 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.4 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.7 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 134 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 150 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 200 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 225 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 average≤ .0043 mg/Lall year001
Cyanide, free [as free]daily maximum≤ .0085 mg/Lall year001
Cyanide, free [as free]monthly averagereport only (mg/L)all year001
Cyanide, free [as free]daily maximumreport only (mg/L)all year001
Nickel, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Silver total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Silver total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Silver total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Silver total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverablequarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average≤ .06 mg/LApr–Oct001
Chlorine, total residualdaily maximum≤ .06 mg/LApr–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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Feb, Aug001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Mar, Sep001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Mar, Sep001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronic (alert, not enforceable)Feb, Aug001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronic (alert, not enforceable)Mar, Sep001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronic (alert, not enforceable)Mar, Sep001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Feb, Aug001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Mar, Sep001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Mar, Sep001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronic (alert, not enforceable)Feb, Aug001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronic (alert, not enforceable)Mar, Sep001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronic (alert, not enforceable)Mar, Sep001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 30 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2086 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1669 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 3338 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 2504 lb/dMay–Nov001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Durationmonthly totalreport only (hr/mo)all year002
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year002
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year002
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year002

How strict are these limits?

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

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