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Sewerage Systems, Lafayette, Louisiana. NPDES permit LA0126857, in force until Sep 30, 2030. Last 12 months: over a limit once (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 5.9 mg/L | ≤ 5 mg/L | 18% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5 mg/L | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | May–Dec | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan–Apr | 001 |
| Solids, total suspended | daily maximum | ≤ 23 mg/L | May–Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jan–Apr | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May–Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Jan–Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | May–Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jan–Apr | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan–Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan–Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | May–Dec | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5 mg/L | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan–Apr | 002 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | May–Dec | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | Jan–Apr | 002 |
| Solids, total suspended | daily maximum | ≤ 23 mg/L | May–Dec | 002 |
| Solids, total suspended | monthly average | ≤ 20 lb/d | Jan–Apr | 002 |
| Solids, total suspended | monthly average | ≤ 15 lb/d | May–Dec | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Jan–Apr | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May–Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jan–Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | May–Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 lb/d | Jan–Apr | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 lb/d | May–Dec | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | all year | 002 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 002 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan–Apr | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | May–Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan–Apr | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | May–Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 lb/d | Jan–Apr | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 lb/d | May–Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 002 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Chlorine, total residual, instantaneous maximum | 0.033 mg/L | new | 2.2 mg/L (10 values) | 66.7× |
Cited limits by parameter: Louisiana's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/LA0126857 · MCP: https://passage-data.com/mcp