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Inorganic Pigments, major discharger, Corpus Christi, Texas. NPDES permit TX0004685, in force until Sep 16, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily average | ≤ 105 deg F | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 107 deg F | all year | 001 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 2 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily average | ≤ 4392 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 13282 lb/d | all year | 001 |
| Oil & Grease | daily average | ≤ 278 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 371 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 |
| Chromium, hexavalent [as Cr] | daily average | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .32 mg/L | all year | 001 |
| Copper, total [as Cu] | daily average | ≤ 1.16 lb/d | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ 1.69 lb/d | all year | 001 |
| Silver, total [as Ag] | daily average | ≤ .35 lb/d | all year | 001 |
| Silver, total [as Ag] | daily maximum | ≤ .74 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 20 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 25 MGD | all year | 001 |
| Chlorine, free available | daily average | ≤ 10.01 lb/d | all year | 001 |
| Chlorine, free available | daily maximum | ≤ 25.04 lb/d | all year | 001 |
| Solids, total suspended | daily average | ≤ 54 lb/d | all year | 101 |
| Solids, total suspended | daily maximum | ≤ 108 lb/d | all year | 101 |
| Chromium, hexavalent [as Cr] | daily average | ≤ .12 lb/d | all year | 101 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .22 lb/d | all year | 101 |
| Chromium, total [as Cr] | daily average | ≤ .75 lb/d | all year | 101 |
| Chromium, total [as Cr] | daily maximum | ≤ 1.5 lb/d | all year | 101 |
| Copper, total [as Cu] | daily average | report only (mg/L) | all year | 101 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 101 |
| Lead, total [as Pb] | daily average | report only (mg/L) | all year | 101 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 101 |
| Nickel, total [as Ni] | daily average | ≤ .8 lb/d | all year | 101 |
| Nickel, total [as Ni] | daily maximum | ≤ 1.7 lb/d | all year | 101 |
| Zinc, total [as Zn] | daily average | report only (mg/L) | all year | 101 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 101 |
| Flow [dry weather] | daily average | ≤ .35 MGD | all year | 101 |
| Flow [dry weather] | daily maximum | ≤ .8 MGD | all year | 101 |
| Solids, total suspended | daily average | ≤ 25 lb/d | all year | 201 |
| Solids, total suspended | daily maximum | ≤ 50 lb/d | all year | 201 |
| Chromium, hexavalent [as Cr] | daily average | report only (mg/L) | all year | 201 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 201 |
| Chromium, total [as Cr] | daily average | ≤ .75 lb/d | all year | 201 |
| Chromium, total [as Cr] | daily maximum | ≤ 1.5 lb/d | all year | 201 |
| Copper, total [as Cu] | daily average | report only (mg/L) | all year | 201 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 201 |
| Lead, total [as Pb] | daily average | ≤ .9 lb/d | all year | 201 |
| Lead, total [as Pb] | daily maximum | ≤ 1.8 lb/d | all year | 201 |
| Nickel, total [as Ni] | daily average | report only (mg/L) | all year | 201 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 201 |
| Zinc, total [as Zn] | daily average | ≤ 1.2 lb/d | all year | 201 |
| Zinc, total [as Zn] | daily maximum | ≤ 2.4 lb/d | all year | 201 |
| Flow, in conduit or thru treatment plant | daily average | ≤ .2 MGD | all year | 201 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .4 MGD | all year | 201 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 20 mg/L | all year | 301 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year | 301 |
| Solids, total suspended | daily average | ≤ 20 mg/L | all year | 301 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 301 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 301 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 301 |
| Chlorine, total residual | monthly minimum | ≥ 1 mg/L | all year | 301 |
| Chlorine, total residual | monthly maximum | ≤ 4 mg/L | all year | 301 |
| Enterococci | daily average | ≤ 35 CFU/100mL | all year | 301 |
| Enterococci | daily maximum | ≤ 89 CFU/100mL | all year | 301 |
| Whole effluent toxicity - retest #1 | 7-day 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 | 7-day 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 Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina | monthly average minimum | report only (%) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina | monthly average minimum | report only (pass=0;fail=1) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | monthly average minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina | 7-day minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina | 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 Americamysis bahia (formerly Mysidopsis bahia) | single sample | report only (pass=0;fail=1) | all year | TXA |
| LC50 Pass/Fail Static 24Hr Acute Menidia beryllina | single sample | report only (pass=0;fail=1) | all year | TXA |
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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