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Sewage treatment plant, major discharger, Houston, Texas. NPDES permit TX0023841 expired Nov 21, 2025; its limits still apply. Last 12 months: over a limit 7 times (last August 2026), 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | pH, maximum | 9.1 SU | ≤ 9 SU | — |
| January 2026 | E. coli, daily maximum | 770 CFU/100mL | ≤ 200 CFU/100mL | 285% |
| March 2026 | Solids, total suspended, daily average | 17.1 mg/L | ≤ 15 mg/L | 14% |
| March 2026 | Solids, total suspended, daily maximum | 50 mg/L | ≤ 40 mg/L | 25% |
| April 2026 | BOD, 5-day, 20 deg. C, daily maximum | 42 mg/L | ≤ 25 mg/L | 68% |
| July 2026 | E. coli, daily maximum | 1300 CFU/100mL | ≤ 200 CFU/100mL | 550% |
| August 2026 | BOD, 5-day, 20 deg. C, daily maximum | 40 mg/L | ≤ 25 mg/L | 60% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 4 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 10 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 25 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 167 lb/d | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily average | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 40 mg/L | all year | 001 |
| Solids, total suspended | daily average | ≤ 250 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 |
| Silver, total [as Ag] | daily average | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | 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 | ≤ 4167 gal/min | all year | 001 |
| Flow, in conduit or thru treatment plant | annual average | ≤ 2 MGD | all year | 001 |
| Chlorine, total residual | instantaneous maximum | < .1 mg/L | all year | 001 |
| Chlorine, total residual | monthly minimum | ≥ 1 mg/L | all year | 001 |
| E. coli | daily average | ≤ 63 CFU/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 200 CFU/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 - retest #1 | single sample | report only (pass=0;fail=1) | all year | TXA |
| Whole effluent toxicity - retest #2 | single sample | report only (pass=0;fail=1) | 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
Your permit document is the final word. As JSON: /api/v1/permits/TX0023841 · MCP: https://passage-data.com/mcp