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Industrial Inorganic Chemicals, major discharger, Marshall, Texas. NPDES permit TX0000710 expired Sep 23, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | daily average | ≤ 115 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 230 lb/d | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily average | ≤ 955 lb/d | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 1910 lb/d | all year | 002 |
| pH | minimum | ≥ 5 SU | all year | 002 |
| pH | maximum | ≤ 11 SU | all year | 002 |
| Solids, total suspended | daily average | ≤ 172 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 344 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | daily average | ≤ 107 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 214 lb/d | all year | 002 |
| Selenium, total [as Se] | daily average | ≤ .111 mg/L | all year | 002 |
| Selenium, total [as Se] | daily maximum | ≤ .236 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 2 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 4 MGD | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| pH range excursions, > 60 minutes | monthly total | ≤ 0 occur/mo | all year | 002 |
| pH range excursions, monthly total accum | monthly total | ≤ 446 min | all year | 002 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole effluent toxicity - retest #1 | monthly average minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole effluent toxicity - retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole effluent toxicity - retest #2 | monthly average minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole Effluent Toxicity [WET] - D. pulex | 48-hour minimum | ≥ 35 % | all year | TX2 |
| Whole Effluent Toxicity [WET] - D. pulex | monthly average minimum | ≥ 35 % | all year | TX2 |
| Whole Effluent Toxicity [WET] - P. promelas | 48-hour minimum | ≥ 35 % | all year | TX2 |
| Whole Effluent Toxicity [WET] - P. promelas | monthly average minimum | ≥ 35 % | all year | TX2 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | TX2 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | monthly average minimum | report only (pass=0;fail=1) | all year | TX2 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX2 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (pass=0;fail=1) | all year | TX2 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX2 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | monthly average minimum | report only (%) | all year | TX2 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX2 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | monthly average minimum | report only (%) | all year | TX2 |
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX2 |
| LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex | monthly average minimum | report only (%) | all year | TX2 |
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX2 |
| LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas | monthly average minimum | report only (%) | all year | TX2 |
| Whole effluent toxicity - retest #1 | single sample | report only (pass=0;fail=1) | all year | TXB |
| Whole effluent toxicity - retest #2 | single sample | report only (pass=0;fail=1) | all year | TXB |
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | single sample | report only (pass=0;fail=1) | all year | TXB |
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | single sample | report only (pass=0;fail=1) | all year | TXB |
Cited limits by parameter: Texas's rules and the federal ones.
Same industry: the 165 Chemicals and Allied Products permits in Texas.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/TX0000710 · MCP: https://passage-data.com/mcp