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Sewerage Systems, major discharger, Slidell, Louisiana. NPDES permit LA0117765 expired Jul 18, 2026; its limits still apply. Last 12 months: over a limit 3 times (last August 2026), 4 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Chlorine, total residual, instantaneous maximum | .25 mg/L | ≤ .033 mg/L | 658% |
| August 2026 | Coliform, fecal general, daily maximum | 5520 #/100mL | ≤ 400 CFU/100mL | 1280% |
| August 2026 | Enterococci, daily maximum | 2420 #/100mL | ≤ 130 CFU/100mL | 1762% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 8.5 SU | all year |
| pH | instantaneous maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 23 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 23 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 122 lb/d | all year |
| Solids, total suspended | monthly average | ≤ 181 lb/d | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 32.5 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 48.4 lb/d | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Oil and grease | daily maximum | ≤ 15 mg/L | all year |
| Oil and grease | daily maximum | ≤ 15 mg/L | all year |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year |
| Whole effluent toxicity - retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year |
| Whole effluent toxicity - retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year |
| Whole effluent toxicity - retest #2 | monthly average minimum | report only (pass=0;fail=1) | all year |
| WET, sublethal retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year |
| WET, sublethal retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year |
| WET, sublethal retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year |
| WET, sublethal retest #2 | monthly average minimum | report only (pass=0;fail=1) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .033 mg/L | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .033 mg/L | all year |
| Whole Effluent Toxicity - Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year |
| Whole Effluent Toxicity - Retest #3 | monthly average minimum | report only (pass=0;fail=1) | all year |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | monthly average minimum | report only (pass=0;fail=1) | all year |
| Enterococci | monthly geometric mean | ≤ 35 #/100mL | May–Oct |
| Enterococci | monthly geometric mean | ≤ 35 CFU/100mL | May–Oct |
| Enterococci | daily maximum | ≤ 130 #/100mL | May–Oct |
| Enterococci | daily maximum | ≤ 130 CFU/100mL | May–Oct |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year |
| Coliform, fecal general | monthly geometric mean | ≤ 200 CFU/100mL | all year |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year |
| Coliform, fecal general | daily maximum | ≤ 400 CFU/100mL | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 81.3 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 121 lb/d | all year |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (pass=0;fail=1) | all year |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | maximum | report only (%) | all year |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | maximum | report only (%) | all year |
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/LA0117765 · MCP: https://passage-data.com/mcp