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Lake Charles, City of- STP

Sewage treatment plant, major discharger, Lake Charles, Louisiana. NPDES permit LA0118770, in force until Jul 31, 2027. Last 12 months: over a limit 13 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (14 values), form CE quarterly (21 values), form PI quarterly (21 values), form Q quarterly (13 values)
Renewal application due
Feb 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 1 of 24 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
February 2026Coliform, fecal general, monthly geometric mean17 CFU/100mL≤ 14 CFU/100mL21%
February 2026Coliform, fecal general, weekly geometric mean59 CFU/100mL≤ 43 CFU/100mL37%
March 2026Copper, total [as Cu], monthly average.14 lb/d≤ .12 lb/d17%
May 2026Enterococci, monthly geometric mean189 CFU/100mL≤ 35 CFU/100mL440%
May 2026Enterococci, weekly geometric mean1410 CFU/100mL≤ 130 CFU/100mL985%
June 2026Copper, total [as Cu], daily maximum.47 lb/d≤ .28 lb/d68%
June 2026Copper, total [as Cu], monthly average.305 lb/d≤ .12 lb/d154%
August 2026Enterococci, monthly geometric mean76 CFU/100mL≤ 35 CFU/100mL117%
August 2026Solids, total suspended, monthly average20.09 mg/L≤ 15 mg/L34%
August 2026Solids, total suspended, weekly average25.3 mg/L≤ 23 mg/L10%
September 2026Copper, total [as Cu], monthly average.225 lb/d≤ .12 lb/d88%
September 2026Enterococci, monthly geometric mean71 CFU/100mL≤ 35 CFU/100mL103%
September 2026Solids, total suspended, monthly average17.54 mg/L≤ 15 mg/L17%

Limits in force (69)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 413 lb/dall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 619 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Copper, total [as Cu]monthly averagereport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]monthly average≤ .12 lb/dall year
Copper, total [as Cu]daily maximum≤ .28 lb/dall year
Silver, total [as Ag]monthly averagereport only (mg/L)all year
Silver, total [as Ag]weekly averagereport only (mg/L)all year
Silver, total [as Ag]monthly averagereport only (lb/d)all year
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #17-day minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #17-day minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #1monthly average minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #1monthly average minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #27-day minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #27-day minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #2monthly average minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #2monthly average minimumreport only (pass=0;fail=1)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Whole Effluent Toxicity - Retest #37-day minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity - Retest #37-day minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity, Sub-Lethal Retest #37-day minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity, Sub-Lethal Retest #37-day minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity, Sub-Lethal Retest #3monthly average minimumreport only (pass=0;fail=1)all year
Whole Effluent Toxicity, Sub-Lethal Retest #3monthly average minimumreport only (pass=0;fail=1)all year
Enterococcimonthly geometric mean≤ 35 CFU/100mLall year
Enterococciweekly geometric mean≤ 130 CFU/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 14 CFU/100mLall year
Coliform, fecal generalweekly geometric mean≤ 43 CFU/100mLall year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0118770 · MCP: https://passage-data.com/mcp