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City of Lake Charles- WWTP B,C

Sewage treatment plant, major discharger, Lake Charles, Louisiana. NPDES permit LA0036366 expired Sep 30, 2019; its limits still apply. Last 12 months: over a limit 21 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (16 values), form CE quarterly (17 values), form PI quarterly (17 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
21 values over a limit, 0 required values missing, 1 of 20 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average1435.78 lb/d≤ 776 lb/d85%
October 2025Solids, total suspended, monthly average25.6 mg/L≤ 15 mg/L71%
October 2025Solids, total suspended, weekly average105.18 mg/L≤ 23 mg/L357%
April 2026Nitrogen, ammonia total [as N], monthly average301.82 lb/d≤ 259 lb/d17%
April 2026Nitrogen, ammonia total [as N], monthly average6.8 mg/L≤ 5 mg/L36%
April 2026Nitrogen, ammonia total [as N], weekly average11.53 mg/L≤ 10 mg/L15%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average10.63 mg/L≤ 10 mg/L6%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average568.31 lb/d≤ 517 lb/d10%
June 2026BOD, carbonaceous [5 day, 20 C], weekly average16.32 mg/L≤ 15 mg/L9%
June 2026Coliform, fecal general, weekly geometric mean642 #/100mL≤ 400 #/100mL61%
June 2026Nitrogen, ammonia total [as N], weekly average13.71 mg/L≤ 10 mg/L37%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average11.81 mg/L≤ 10 mg/L18%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average695.5 lb/d≤ 517 lb/d35%
July 2026Coliform, fecal general, monthly geometric mean230 #/100mL≤ 200 #/100mL15%
July 2026Coliform, fecal general, weekly geometric mean704 #/100mL≤ 400 #/100mL76%
July 2026Nitrogen, ammonia total [as N], monthly average524.29 lb/d≤ 259 lb/d102%
July 2026Nitrogen, ammonia total [as N], monthly average9.55 mg/L≤ 5 mg/L91%
July 2026Nitrogen, ammonia total [as N], weekly average12.65 mg/L≤ 10 mg/L27%
July 2026Solids, total suspended, monthly average2951.52 lb/d≤ 776 lb/d280%
July 2026Solids, total suspended, monthly average38.32 mg/L≤ 15 mg/L155%
July 2026Solids, total suspended, weekly average132.73 mg/L≤ 23 mg/L477%

Limits in force (50)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly average minimum≥ 4 mg/Lall 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≤ 776 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 259 lb/dall 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 #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 #2monthly average 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 #27-day minimumreport only (pass=0;fail=1)all year
Whole effluent toxicity - retest #27-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 #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 #2monthly average minimumreport only (pass=0;fail=1)all year
WET, sublethal retest #2monthly 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 517 lb/dall year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-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
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-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 Ceriodaphnia dubia7-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
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-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 Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day 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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0036366 · MCP: https://passage-data.com/mcp