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Sewerage Systems, major discharger, Mandeville, Louisiana. NPDES permit LA0068730, in force until Sep 30, 2029. Last 12 months: over a limit 6 times (last April 2026), 8 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Cyanide, total [as CN], monthly average | .058 lb/d | ≤ .031 lb/d | 87% |
| February 2026 | Coliform, fecal general, daily maximum | 2760 #/100mL | ≤ 400 #/100mL | 590% |
| March 2026 | Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum | 30 % | ≥ 94 % | 68% |
| March 2026 | Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum | 30 % | ≥ 94 % | 68% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 20 mg/L | ≤ 8 mg/L | 150% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | < 6 mg/L | ≤ 4 mg/L | 50% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 8.5 SU | 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 | monthly average | ≤ 119 lb/d | 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] | 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] | daily maximum | ≤ 8 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 32 lb/d | 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] | monthly average | report only (lb/d) | all year |
| Cyanide, total [as CN] | monthly average | report only (mg/L) | all year |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | all year |
| Cyanide, total [as CN] | monthly average | ≤ .031 lb/d | all year |
| Cyanide, total [as CN] | daily maximum | ≤ .075 lb/d | all year |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | 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 #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 | 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 |
| 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 | 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 #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 | 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 |
| 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 | daily 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 | 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 - 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 | 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 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | monthly average minimum | report only (pass=0;fail=1) | all year |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 94 % | all year |
| Whole Effluent Toxicity [WET] - C. dubia | monthly average minimum | ≥ 94 % | all year |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 94 % | all year |
| Whole Effluent Toxicity [WET] - P. promelas | monthly average minimum | ≥ 94 % | all year |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | 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] | monthly average | ≤ 79 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
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