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Sewage treatment plant, major discharger, Laredo, Texas. NPDES permit TX0025461, in force until Oct 31, 2027. Last 12 months: over a limit 39 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, 5-day, 20 deg. C, daily average | 3533 lb/d | ≤ 2335 lb/d | 51% |
| October 2025 | BOD, 5-day, 20 deg. C, daily average | 45.3 mg/L | ≤ 20 mg/L | 127% |
| October 2025 | BOD, 5-day, 20 deg. C, daily maximum | 78 mg/L | ≤ 45 mg/L | 73% |
| October 2025 | E. coli, daily average | 1438.4 MPN/100mL | ≤ 126 MPN/100mL | 1042% |
| October 2025 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| October 2025 | Solids, total suspended, daily average | 5014 lb/d | ≤ 2335 lb/d | 115% |
| October 2025 | Solids, total suspended, daily average | 64.2 mg/L | ≤ 20 mg/L | 221% |
| October 2025 | Solids, total suspended, daily maximum | 81 mg/L | ≤ 45 mg/L | 80% |
| November 2025 | BOD, 5-day, 20 deg. C, daily average | 3839 lb/d | ≤ 2335 lb/d | 64% |
| November 2025 | BOD, 5-day, 20 deg. C, daily average | 49.2 mg/L | ≤ 20 mg/L | 146% |
| November 2025 | BOD, 5-day, 20 deg. C, daily maximum | 88 mg/L | ≤ 45 mg/L | 96% |
| November 2025 | E. coli, daily average | 1330 MPN/100mL | ≤ 126 MPN/100mL | 956% |
| November 2025 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| November 2025 | Solids, total suspended, daily average | 4762 lb/d | ≤ 2335 lb/d | 104% |
| November 2025 | Solids, total suspended, daily average | 61.1 mg/L | ≤ 20 mg/L | 206% |
| November 2025 | Solids, total suspended, daily maximum | 122 mg/L | ≤ 45 mg/L | 171% |
| December 2025 | BOD, 5-day, 20 deg. C, daily average | 2590 lb/d | ≤ 2335 lb/d | 11% |
| December 2025 | BOD, 5-day, 20 deg. C, daily average | 34.3 mg/L | ≤ 20 mg/L | 72% |
| December 2025 | BOD, 5-day, 20 deg. C, daily maximum | 130 mg/L | ≤ 45 mg/L | 189% |
| December 2025 | E. coli, daily average | > 1314.2 MPN/100mL | ≤ 126 MPN/100mL | — |
| December 2025 | E. coli, daily maximum | > 2419.6 MPN/100mL | ≤ 399 MPN/100mL | — |
| December 2025 | Solids, total suspended, daily average | 2561 lb/d | ≤ 2335 lb/d | 10% |
| December 2025 | Solids, total suspended, daily average | 33.8 mg/L | ≤ 20 mg/L | 69% |
| December 2025 | Solids, total suspended, daily maximum | 75 mg/L | ≤ 45 mg/L | 67% |
| January 2026 | BOD, 5-day, 20 deg. C, daily average | 30 mg/L | ≤ 20 mg/L | 50% |
| January 2026 | BOD, 5-day, 20 deg. C, daily maximum | 104 mg/L | ≤ 45 mg/L | 131% |
| January 2026 | E. coli, daily average | 249.3 MPN/100mL | ≤ 126 MPN/100mL | 98% |
| January 2026 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| February 2026 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| February 2026 | Solids, total suspended, daily average | 22.5 mg/L | ≤ 20 mg/L | 13% |
| February 2026 | Solids, total suspended, daily maximum | 51 mg/L | ≤ 45 mg/L | 13% |
| March 2026 | Solids, total suspended, daily average | 20.7 mg/L | ≤ 20 mg/L | 4% |
| March 2026 | Solids, total suspended, daily maximum | 46.7 mg/L | ≤ 45 mg/L | 4% |
| April 2026 | E. coli, daily average | 131.1 MPN/100mL | ≤ 126 MPN/100mL | 4% |
| April 2026 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| May 2026 | BOD, 5-day, 20 deg. C, daily average | 20.6 mg/L | ≤ 20 mg/L | 3% |
| May 2026 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| June 2026 | E. coli, daily maximum | 2419.6 MPN/100mL | ≤ 399 MPN/100mL | 506% |
| August 2026 | E. coli, daily maximum | 547.5 MPN/100mL | ≤ 399 MPN/100mL | 37% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 2 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 20 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 2335 lb/d | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | daily average | ≤ 2335 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily average | report only (lb/d) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | 2-hour peak | ≤ 20150 gal/min | all year | 001 |
| Flow, in conduit or thru treatment plant | annual average | ≤ 14 MGD | all year | 001 |
| Chlorine, total residual | monthly minimum | ≥ 1 mg/L | all year | 001 |
| Chlorine, total residual | monthly maximum | ≤ 4 mg/L | all year | 001 |
| E. coli | daily average | ≤ 126 MPN/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 399 MPN/100mL | all year | 001 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | monthly average minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | monthly average minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (%) | all year | TX1 |
| Whole Effluent Toxicity [WET] - P. promelas | single sample | ≤ 100 % | all year | TXA |
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | single sample | report only (pass=0;fail=1) | all year | TXA |
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | single sample | report only (pass=0;fail=1) | all year | TXA |
Cited limits by parameter: Texas's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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