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Sewage treatment plant, major discharger, Thibodaux, Louisiana. NPDES permit LA0127208, in force until Jul 31, 2030. Last 12 months: over a limit 37 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | < 11 mg/L | ≤ 10 mg/L | 10% |
| November 2025 | BOD, carbonaceous [5 day, 20 C], weekly average | < 25 mg/L | ≤ 15 mg/L | 67% |
| November 2025 | Solids, total suspended, monthly average | < 28 mg/L | ≤ 15 mg/L | 87% |
| November 2025 | Solids, total suspended, weekly average | < 56 mg/L | ≤ 23 mg/L | 143% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 18 mg/L | ≤ 10 mg/L | 80% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], weekly average | 28 mg/L | ≤ 15 mg/L | 87% |
| December 2025 | Solids, total suspended, monthly average | < 28 mg/L | ≤ 15 mg/L | 87% |
| December 2025 | Solids, total suspended, weekly average | < 41 mg/L | ≤ 23 mg/L | 78% |
| January 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 13 mg/L | ≤ 10 mg/L | 30% |
| January 2026 | Solids, total suspended, monthly average | 30 mg/L | ≤ 15 mg/L | 100% |
| January 2026 | Solids, total suspended, weekly average | 49 mg/L | ≤ 23 mg/L | 113% |
| February 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 23 mg/L | ≤ 10 mg/L | 130% |
| February 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 42 mg/L | ≤ 15 mg/L | 180% |
| February 2026 | Solids, total suspended, monthly average | 25 mg/L | ≤ 15 mg/L | 67% |
| February 2026 | Solids, total suspended, weekly average | 29 mg/L | ≤ 23 mg/L | 26% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 13 mg/L | ≤ 10 mg/L | 30% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 18 mg/L | ≤ 15 mg/L | 20% |
| March 2026 | Coliform, fecal general, weekly geometric mean | 447 #/100mL | ≤ 400 #/100mL | 12% |
| March 2026 | Solids, suspended percent removal, monthly average minimum | 79.75 % | ≥ 85 % | 35% |
| March 2026 | Solids, total suspended, monthly average | 21 mg/L | ≤ 15 mg/L | 40% |
| March 2026 | Solids, total suspended, weekly average | 26 mg/L | ≤ 23 mg/L | 13% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 11 mg/L | ≤ 10 mg/L | 10% |
| April 2026 | Coliform, fecal general, weekly geometric mean | 1000 #/100mL | ≤ 400 #/100mL | 150% |
| April 2026 | Solids, total suspended, monthly average | 21 mg/L | ≤ 15 mg/L | 40% |
| April 2026 | Solids, total suspended, weekly average | 24 mg/L | ≤ 23 mg/L | 4% |
| May 2026 | Coliform, fecal general, weekly geometric mean | 837 #/100mL | ≤ 400 #/100mL | 109% |
| May 2026 | Solids, total suspended, monthly average | 16 mg/L | ≤ 15 mg/L | 7% |
| June 2026 | Solids, total suspended, monthly average | 21 mg/L | ≤ 15 mg/L | 40% |
| June 2026 | Solids, total suspended, weekly average | 25 mg/L | ≤ 23 mg/L | 9% |
| July 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 20 mg/L | ≤ 15 mg/L | 33% |
| July 2026 | Solids, total suspended, monthly average | 18 mg/L | ≤ 15 mg/L | 20% |
| July 2026 | Solids, total suspended, weekly average | 24 mg/L | ≤ 23 mg/L | 4% |
| August 2026 | Solids, total suspended, monthly average | 19 mg/L | ≤ 15 mg/L | 27% |
| September 2026 | BOD, percent removal [total], monthly average minimum | 83 % | ≥ 85 % | 13% |
| September 2026 | Solids, suspended percent removal, monthly average minimum | 74 % | ≥ 85 % | 73% |
| September 2026 | Solids, total suspended, monthly average | 19 mg/L | ≤ 15 mg/L | 27% |
| September 2026 | Solids, total suspended, weekly average | 24 mg/L | ≤ 23 mg/L | 4% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | weekly average | ≤ 23 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 188 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | weekly average | 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 | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (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 | weekly average | report only (MGD) | all year |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | 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 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year |
| Coliform, fecal general | weekly geometric mean | ≤ 400 #/100mL | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 125 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], monthly average | 1.1 mg/L | new | 2.955 mg/L (12 values) | 2.69× |
| Nitrogen, ammonia total [as N], monthly average | 13.8 lb/d | new | 14.5 lb/d (12 values) | 1.05× |
| Nitrogen, ammonia total [as N], weekly average | 7.7 mg/L | new | 4.2 mg/L (12 values) | 0.545× |
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/LA0127208 · MCP: https://passage-data.com/mcp